{"id":6399,"date":"2026-04-01T08:00:00","date_gmt":"2026-04-01T05:00:00","guid":{"rendered":"https:\/\/axinar.com\/faq-xylolevites"},"modified":"2026-04-22T15:05:14","modified_gmt":"2026-04-22T12:05:14","slug":"faq-wood-boilers","status":"publish","type":"page","link":"https:\/\/axinar.com\/en\/faq-wood-boilers","title":{"rendered":"FAQ Wood boilers"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"6399\" class=\"elementor elementor-6399 elementor-5947\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4e023cc e-flex e-con-boxed e-con e-parent\" data-id=\"4e023cc\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-bb7b864 elementor-widget elementor-widget-html\" data-id=\"bb7b864\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     AXINAR ACADEMY, FAQ WOOD BOILERS (EN)\n     79 questions in 11 categories\n     \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n\n<link href=\"https:\/\/fonts.googleapis.com\/css2?family=Barlow+Condensed:wght@400;500;600;700;800&amp;family=Barlow:wght@300;400;500;600&amp;display=swap\" rel=\"stylesheet\">\n<link rel=\"stylesheet\" href=\"https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/font-awesome\/6.5.1\/css\/all.min.css\">\n\n<style>\n    .ax-faq { max-width: 80vw !important; margin: 0 auto !important; font-family: 'Barlow', sans-serif !important; color: #fff !important; }\n    .ax-faq *, .ax-faq *::before, .ax-faq *::after { box-sizing: border-box !important; }\n    .ax-faq a { text-decoration: none !important; color: inherit !important; }\n    .ax-faq img { max-width: 100%; height: auto; }\n\n    .ax-faq-hero { position: relative !important; overflow: hidden !important; min-height: 50vh !important; display: flex !important; align-items: center !important; margin-left: calc(-50vw + 50%) !important; margin-right: calc(-50vw + 50%) !important; width: 100vw !important; }\n    .ax-faq-hero-bg { position: absolute !important; inset: 0 !important; background: url('https:\/\/axinar.com\/wp-content\/uploads\/2025\/05\/kausimo-pellet-lebites-axinar.webp') center \/ cover no-repeat !important; }\n    .ax-faq-hero-bg::after { content: '' !important; position: absolute !important; inset: 0 !important; background: linear-gradient(135deg, rgba(14,15,15,0.93) 0%, rgba(14,15,15,0.75) 50%, rgba(14,15,15,0.5) 100%) !important; }\n    .ax-faq-hero-content { position: relative !important; z-index: 2 !important; padding: clamp(37px, 3.33vw, 69px) !important; padding-top: clamp(87px, 7.78vh, 161px) !important; padding-left: calc((100vw - 80vw) \/ 2) !important; max-width: 800px !important; }\n    .ax-faq-hero-label { display: inline-flex !important; align-items: center !important; gap: 8px !important; background: rgba(221,43,28,0.12) !important; border: 1px solid rgba(221,43,28,0.25) !important; padding: 5px 14px !important; border-radius: 20px !important; font-size: 11px !important; font-weight: 700 !important; color: #DD2B1C !important; text-transform: uppercase !important; letter-spacing: 1.5px !important; margin-bottom: clamp(12px, 0.89vh, 18px) !important; }\n    .ax-faq-hero-content h1 { font-family: 'Barlow Condensed', sans-serif !important; font-size: clamp(33px, 2.47vw, 48px) !important; font-weight: 800 !important; color: #fff !important; text-transform: uppercase !important; margin: 0 0 14px !important; line-height: 1.1 !important; }\n    .ax-faq-hero-content h1 span { color: #DD2B1C !important; }\n    .ax-faq-hero-content p { font-size: clamp(14px, 0.94vw, 18px) !important; color: rgba(255,255,255,0.65) !important; line-height: 1.6 !important; margin: 0 !important; }\n    .ax-faq-breadcrumb { font-size: 13px !important; color: rgba(255,255,255,0.4) !important; margin-bottom: clamp(12px, 1.11vh, 23px) !important; }\n    .ax-faq-breadcrumb a { color: rgba(255,255,255,0.4) !important; transition: color 0.3s !important; }\n    .ax-faq-breadcrumb a:hover { color: #DD2B1C !important; }\n\n    .ax-faq-layout { display: grid !important; grid-template-columns: 260px 1fr !important; gap: clamp(25px, 2.22vw, 46px) !important; padding: clamp(31px, 2.78vw, 57px) 0 clamp(37px, 3.33vw, 69px) !important; align-items: start !important; }\n    .ax-faq-toc { position: sticky !important; top: 100px !important; background: rgba(255,255,255,0.03) !important; border: 1px solid rgba(255,255,255,0.07) !important; border-radius: 12px !important; padding: clamp(15px, 1.33vw, 28px) !important; }\n    .ax-faq-toc-title { font-family: 'Barlow Condensed', sans-serif !important; font-size: 14px !important; font-weight: 700 !important; color: rgba(255,255,255,0.4) !important; text-transform: uppercase !important; letter-spacing: 1px !important; margin: 0 0 14px !important; }\n    .ax-faq-toc a { display: block !important; padding: 8px 12px !important; font-size: 14px !important; color: rgba(255,255,255,0.55) !important; border-radius: 6px !important; transition: all 0.2s !important; border-left: 2px solid transparent !important; }\n    .ax-faq-toc a:hover, .ax-faq-toc a.active { color: #fff !important; background: rgba(221,43,28,0.08) !important; border-left-color: #DD2B1C !important; }\n    .ax-faq-toc a.ax-toc-active { color: #DD2B1C !important; background: rgba(221,43,28,0.08) !important; border-left-color: #DD2B1C !important; }\n\n    .ax-faq-section { margin-bottom: clamp(25px, 2.22vh, 46px) !important; }\n    .ax-faq-section-header { display: flex !important; align-items: center !important; gap: 12px !important; margin-bottom: clamp(12px, 1.11vh, 23px) !important; padding-bottom: 14px !important; border-bottom: 1px solid rgba(255,255,255,0.06) !important; }\n    .ax-faq-section-icon { width: 40px !important; height: 40px !important; border-radius: 10px !important; background: rgba(221,43,28,0.12) !important; display: flex !important; align-items: center !important; justify-content: center !important; flex-shrink: 0 !important; }\n    .ax-faq-section-icon i { font-size: clamp(14px, 0.94vw, 18px) !important; color: #DD2B1C !important; }\n    .ax-faq-section-header h2 { font-family: 'Barlow Condensed', sans-serif !important; font-size: clamp(19px, 1.41vw, 28px) !important; font-weight: 700 !important; color: #fff !important; margin: 0 !important; }\n\n    .ax-faq-item { background: rgba(255,255,255,0.025) !important; border: 1px solid rgba(255,255,255,0.06) !important; border-radius: 10px !important; margin-bottom: 8px !important; overflow: hidden !important; transition: border-color 0.3s !important; scroll-margin-top: 20px !important; }\n    .ax-faq-item:hover { border-color: rgba(255,255,255,0.12) !important; }\n    .ax-faq-item[open] { border-color: rgba(221,43,28,0.3) !important; }\n    .ax-faq-item summary { display: flex !important; align-items: center !important; justify-content: space-between !important; gap: clamp(12px, 0.89vw, 18px) !important; padding: clamp(12px, 1.00vw, 21px) clamp(14px, 1.22vw, 25px) !important; cursor: pointer !important; font-family: 'Barlow', sans-serif !important; font-size: 15px !important; font-weight: 500 !important; color: rgba(255,255,255,0.85) !important; line-height: 1.4 !important; list-style: none !important; transition: color 0.2s !important; }\n    .ax-faq-item summary::-webkit-details-marker { display: none !important; }\n    .ax-faq-item summary::marker { display: none !important; content: '' !important; }\n    .ax-faq-item summary:hover { color: #fff !important; }\n    .ax-faq-item[open] summary { color: #fff !important; }\n    .ax-faq-item summary .ax-faq-arrow { font-size: 12px !important; color: rgba(255,255,255,0.3) !important; transition: transform 0.3s, color 0.3s !important; flex-shrink: 0 !important; }\n    .ax-faq-item[open] summary .ax-faq-arrow { transform: rotate(180deg) !important; color: #DD2B1C !important; }\n    .ax-faq-a-inner { padding: 0 clamp(14px, 1.22vw, 25px) clamp(12px, 1.11vw, 23px) !important; font-size: 14px !important; color: rgba(255,255,255,0.55) !important; line-height: 1.7 !important; }\n    .ax-faq-a-inner p { margin: 0 0 10px !important; }\n    .ax-faq-a-inner ul { margin: 8px 0 !important; padding-left: clamp(12px, 1.11vw, 23px) !important; }\n    .ax-faq-a-inner li { margin-bottom: 4px !important; }\n    .ax-faq-a-inner strong { color: rgba(255,255,255,0.8) !important; }\n\n    .ax-faq-item summary::before { content: attr(data-num) !important; display: inline-flex !important; align-items: center !important; justify-content: center !important; min-width: 28px !important; height: 28px !important; border-radius: 6px !important; background: rgba(221,43,28,0.12) !important; color: #DD2B1C !important; font-family: 'Barlow Condensed', sans-serif !important; font-size: 13px !important; font-weight: 700 !important; flex-shrink: 0 !important; margin-right: 4px !important; }\n\n    .ax-faq-next { display: flex !important; align-items: center !important; gap: 6px !important; padding: 10px clamp(14px, 1.22vw, 25px) 4px !important; font-size: 13px !important; font-family: 'Barlow Condensed', sans-serif !important; font-weight: 600 !important; color: rgba(221,43,28,0.7) !important; cursor: pointer !important; text-transform: uppercase !important; letter-spacing: 0.5px !important; transition: color 0.2s !important; border-top: 1px solid rgba(255,255,255,0.04) !important; margin-top: 8px !important; padding-top: 12px !important; }\n    .ax-faq-next:hover { color: #DD2B1C !important; }\n    .ax-faq-next i { font-size: 11px !important; }\n\n    .ax-faq-back { display: inline-flex !important; align-items: center !important; gap: 8px !important; padding: 12px clamp(15px, 1.33vw, 28px) !important; background: rgba(255,255,255,0.04) !important; border: 1px solid rgba(255,255,255,0.1) !important; border-radius: 8px !important; font-family: 'Barlow Condensed', sans-serif !important; font-size: 14px !important; font-weight: 600 !important; color: rgba(255,255,255,0.6) !important; text-transform: uppercase !important; letter-spacing: 0.5px !important; transition: all 0.3s !important; margin-bottom: clamp(25px, 2.22vh, 46px) !important; }\n    .ax-faq-back:hover { border-color: #DD2B1C !important; color: #fff !important; }\n\n    @media (max-width: 1024px) { .ax-faq { max-width: 90vw !important; } .ax-faq-layout { grid-template-columns: 1fr !important; } .ax-faq-toc { position: static !important; } .ax-faq-hero-content { padding: 40px !important; padding-top: 120px !important; } }\n    @media (max-width: 768px) { .ax-faq { max-width: 94vw !important; } .ax-faq-hero { min-height: 40vh !important; } .ax-faq-hero-content { padding: 24px !important; padding-top: 110px !important; } .ax-faq-hero-content h1 { font-size: 30px !important; } .ax-faq-item summary { font-size: 14px !important; padding: 14px 16px !important; } .ax-faq-a-inner { padding: 0 16px 16px !important; font-size: 13px !important; } }\n<\/style>\n\n<div class=\"ax-faq\">\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 HERO \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<div class=\"ax-faq-hero\">\n    <div class=\"ax-faq-hero-bg\"><\/div>\n    <div class=\"ax-faq-hero-content\">\n        <div class=\"ax-faq-breadcrumb\">\n            <a href=\"\/\">Home<\/a> \/ <a href=\"https:\/\/axinar.com\/en\/axinar-academy\">Academy<\/a> \/ <span style=\"color:rgba(255,255,255,0.65);\">FAQ Wood Boilers<\/span>\n        <\/div>\n        <div class=\"ax-faq-hero-label\"><i class=\"fas fa-fire\"><\/i> Axinar Wood Boilers<\/div>\n        <h1>Frequently Asked <span>Questions<\/span><\/h1>\n        <p>79 technical questions and answers about wood boilers, combustion, hydraulics, safety, automation, and installation.<\/p>\n    <\/div>\n<\/div>\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 LAYOUT \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n<div class=\"ax-faq-layout\">\n\n    <!-- TOC SIDEBAR -->\n    <nav class=\"ax-faq-toc\">\n        <div class=\"ax-faq-toc-title\">Sections<\/div>\n        <a href=\"#sec-general\">General<\/a>\n        <a href=\"#sec-construction\">Construction &amp; Materials<\/a>\n        <a href=\"#sec-hydraulic\">Hydraulic System<\/a>\n        <a href=\"#sec-safety\">Safety<\/a>\n        <a href=\"#sec-air\">Air &amp; Combustion<\/a>\n        <a href=\"#sec-wood\">Firewood<\/a>\n        <a href=\"#sec-performance\">Performance &amp; Efficiency<\/a>\n        <a href=\"#sec-automation\">Automation<\/a>\n        <a href=\"#sec-installation\">Installation<\/a>\n        <a href=\"#sec-maintenance\">Maintenance &amp; Troubleshooting<\/a>\n        <a href=\"#sec-warranty\">Purchase &amp; Warranty<\/a>\n    <\/nav>\n\n    <!-- FAQ CONTENT -->\n    <div class=\"ax-faq-content\">\n\n        <a href=\"https:\/\/axinar.com\/en\/axinar-academy#ax-academy-faq\" class=\"ax-faq-back\"><i class=\"fas fa-arrow-left\"><\/i> Back to FAQ Categories<\/a>\n\n        <!-- \u2550\u2550 1. GENERAL \u2550\u2550 -->\n        <div class=\"ax-faq-section\" id=\"sec-general\">\n            <div class=\"ax-faq-section-header\">\n                <div class=\"ax-faq-section-icon\"><i class=\"fas fa-info-circle\"><\/i><\/div>\n                <h2>General<\/h2>\n            <\/div>\n\n            <details class=\"ax-faq-item\" data-num=\"1\"><summary data-num=\"1\">Why are there no cheap boiler options the way there are for stoves or heat pumps? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>In boilers, 90% of the cost is raw materials (metals) and only 10% is labour. Metals cost the same worldwide for equivalent quality. Stoves and heat pumps, by contrast, are lightweight assemblies built from many small components, low material cost, high labour content. That is why cheap options exist there but not in boilers.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"2\"><summary data-num=\"2\">Why buy a branded boiler instead of a cheap, opportunistic one? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>With a branded boiler you are not just buying a machine, you are buying technology and engineering know-how. Specifically:<\/p><ul><li>Performance monitoring, which means fuel savings<\/li><li>Emissions control for reduced environmental impact<\/li><li>Automation and ease of use<\/li><li>Reliable service and spare parts availability over the long term<\/li><\/ul><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"3\"><summary data-num=\"3\">What are the key advantages of the Axinar wood boiler? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><ul><li><strong>Room thermostat control<\/strong>, operates exactly like an oil boiler<\/li><li><strong>Automatic coordination with the oil boiler<\/strong>, no manual valve intervention required<\/li><li><strong>Magnetic damper<\/strong>, full airflow control and fail-safe protection<\/li><li><strong>Flue gas sensor<\/strong>, optimal combustion and fuel efficiency<\/li><li><strong>Ember retention system<\/strong>, the boiler shuts down completely only 2\u20133 times per winter<\/li><li><strong>3 registered patents<\/strong> in combustion control technology<\/li><\/ul><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n        <\/div>\n\n        <!-- \u2550\u2550 2. CONSTRUCTION & MATERIALS \u2550\u2550 -->\n        <div class=\"ax-faq-section\" id=\"sec-construction\">\n            <div class=\"ax-faq-section-header\">\n                <div class=\"ax-faq-section-icon\"><i class=\"fas fa-hammer\"><\/i><\/div>\n                <h2>Construction &amp; Materials<\/h2>\n            <\/div>\n\n            <details class=\"ax-faq-item\" data-num=\"4\"><summary data-num=\"4\">What steel plate thickness should a boiler have? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>According to European standard EN303-5: 5mm in the combustion chamber (where the flame directly impinges), 4mm where only flue gas contacts the surface, and 3mm where only water is in contact. Thicker external casing adds nothing, it only increases cost.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"5\"><summary data-num=\"5\">Welded or cast iron construction? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Welded steel. Cast iron cannot withstand thermal shock, and inside the combustion chamber you simultaneously have a flame at 700\u00b0C, embers at 1200\u00b0C, and cold wood that has just been loaded. Cast iron boilers are also 2.5 times heavier for equivalent structural strength.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"6\"><summary data-num=\"6\">Which welding method is best? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>For domestic boilers, wire welding (MIG\/MAG) is entirely adequate. Electrode welding is reserved for refineries and steam boilers operating at 300+ bar. For residential boilers, exceeding the required specifications only drives up costs unnecessarily.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"7\"><summary data-num=\"7\">Why are seamless (Mannesmann) pipes used? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>EN303-5 requires seamless pipes because they withstand alternating thermal loads and corrosive environments. Axinar uses exclusively Mannesmann seamless pipes, they cost 1.8\u00d7 more than welded alternatives, but guarantee long-term reliability and service life.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"8\"><summary data-num=\"8\">A dealer is offering a boiler with \"fire-resistant steel plate\". Is that better? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Genuine fire-resistant steel withstands up to 900\u00b0C and costs roughly \u20ac10\/kg, using it for a full boiler shell would cost around \u20ac2,000. In reality, the boiler's steel plate never exceeds 130\u00b0C because it is continuously cooled by water. Fire-resistant plate is completely unnecessary here, this is a marketing claim worth scrutinising.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"9\"><summary data-num=\"9\">What steel grade is used? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>EN303-5 specifies approximately 20 suitable steel grades for boiler construction, such as E235 or S235JR. Steel quality cannot be assessed visually, it requires laboratory analysis. Axinar accepts materials only when accompanied by certified quality documentation.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"10\"><summary data-num=\"10\">What size logs fit in the Axinar boiler? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>The door is deliberately oversized to accommodate large logs and root wood. As a reference, a 25-litre jerrycan fits through the door opening. Because the door is positioned high on the chamber, the flame does not impinge on it and no heat energy is lost.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"11\"><summary data-num=\"11\">What is a water-cooled grate? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>It is the grate on which the logs rest, cooled by the boiler's circulating water. In the Axinar boiler the entire interior is water-cooled, this significantly increases efficiency by transferring more heat to the water instead of losing it through the structure.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n        <\/div>\n\n        <!-- \u2550\u2550 3. HYDRAULIC SYSTEM \u2550\u2550 -->\n        <div class=\"ax-faq-section\" id=\"sec-hydraulic\">\n            <div class=\"ax-faq-section-header\">\n                <div class=\"ax-faq-section-icon\"><i class=\"fas fa-tint\"><\/i><\/div>\n                <h2>Hydraulic System<\/h2>\n            <\/div>\n\n            <details class=\"ax-faq-item\" data-num=\"12\"><summary data-num=\"12\">Is more water volume in the boiler better? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>No. A larger water volume reduces efficiency because the water moves more slowly. Only the inner steel surface (facing the fire) actually heats the water. The Axinar magnetic damper eliminates the risk of overheating, allowing a smaller water volume and better thermal performance.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"13\"><summary data-num=\"13\">Open or closed expansion vessel? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Closed. An open vessel exposes the water to the atmosphere, continuously introducing air and dust that corrode the system. In a closed circuit, corrosion essentially stops once the initial dissolved oxygen is consumed. A closed system has a significantly longer service life.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"14\"><summary data-num=\"14\">Is an open expansion vessel safer? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>No, and it can actually be dangerous if not installed correctly. If the pipe to the open vessel freezes, it becomes worse than a closed system. In a closed circuit at 3 bar, the boiling point rises to 130\u00b0C instead of 100\u00b0C, providing a much greater safety margin.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"15\"><summary data-num=\"15\">What is a three-way mixing valve? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>It keeps the return water temperature above 55\u00b0C before it re-enters the boiler. This prevents tar build-up inside the combustion chamber.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"16\"><summary data-num=\"16\">Does the Axinar boiler need a three-way mixing valve? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>No. The Axinar boiler has a built-in recirculation bypass with a minimum \u00bd-inch bore, no moving parts, nothing to seize, nothing to clog, nothing to maintain. This saves approximately \u20ac100 in installation cost compared to a conventional three-way valve setup.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"17\"><summary data-num=\"17\">Does a wood boiler need a buffer tank? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Under the standard, only when the boiler cannot modulate down to 30% of its maximum output, which typically applies to gasification boilers, not conventional wood boilers. A buffer tank can deliver 2\u201320% energy savings, but a complete installation costs \u20ac1,800\u2013\u20ac2,500. Whether it makes sense depends on the payback calculation.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"18\"><summary data-num=\"18\">Does a buffer tank double the heat output of the boiler? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>No. A buffer tank stores energy, it does not create it. Think of it as a small pot placed under a dripping tap: it collects the drops and releases them all at once, but the tap still drips at the same rate. Managing energy delivery and doubling heat output are two entirely different things.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"19\"><summary data-num=\"19\">How does the buffer tank connect to the Axinar boiler? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Using an innovative approach: while the buffer is cold, water heats the building directly. During thermostat-off intervals, the boiler charges the buffer. Once the buffer reaches temperature, it enters the heating loop in series. This eliminates the delay between the initial fire-up and the moment the buffer is ready to contribute heat.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n        <\/div>\n\n        <!-- \u2550\u2550 4. SAFETY \u2550\u2550 -->\n        <div class=\"ax-faq-section\" id=\"sec-safety\">\n            <div class=\"ax-faq-section-header\">\n                <div class=\"ax-faq-section-icon\"><i class=\"fas fa-shield-alt\"><\/i><\/div>\n                <h2>Safety<\/h2>\n            <\/div>\n\n            <details class=\"ax-faq-item\" data-num=\"20\"><summary data-num=\"20\">Is a cooling heat exchanger required? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>In standard market practice, yes, it is mandatory by regulation for any installation where combustion cannot be stopped by cutting the power. Without it, if the pressure relief valve opens, fresh mains water enters the system carrying dissolved salts and oxygen that corrode the boiler.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"21\"><summary data-num=\"21\">How many safety valves does the boiler need? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Minimum: 2 pressure relief valves (set at 2.5 or 3 bar) and 1 temperature safety valve with a remote sensor for the cooling heat exchanger. Do not save on \u20ac30\u2013\u20ac100 of safety equipment, the resulting damage can be orders of magnitude more costly.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"22\"><summary data-num=\"22\">Where must the safety valves be installed? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Immediately after the boiler, with no valves or isolators between them and the boiler. Their discharge pipes must run to a low, visible point, the water discharges at 95\u2013130\u00b0C, and the discharge must be observable so that any valve operation can be detected promptly.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"23\"><summary data-num=\"23\">How many overheat protection systems does the Axinar boiler have? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Four layers of protection: magnetic damper, recirculation solenoid valve, cooling heat exchanger, and pressure relief valves. The first two are active (electronic); the last two are passive (mechanical).<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"24\"><summary data-num=\"24\">How does the magnetic damper protect against overheating? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>When the water temperature reaches the set point, the damper seals the air inlet and restricts the fire. Its operation is fail-safe: if any electrical fault occurs, the damper defaults to the closed position.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"25\"><summary data-num=\"25\">How does the recirculation solenoid valve work? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>If the water temperature exceeds the safety threshold, the solenoid valve opens and the water circulates internally. This prevents the building from overheating and preserves the stored energy in the boiler rather than dumping it.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"26\"><summary data-num=\"26\">How does the cooling heat exchanger work? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>If the temperature exceeds 95\u201397\u00b0C, the safety valve opens and cold mains water flows through the exchanger to cool the boiler. The cooling water never mixes with the heating circuit water, the closed system remains uncontaminated.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"27\"><summary data-num=\"27\">What happens during a power cut? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>The magnetic damper closes automatically (fail-safe), cutting off the air supply and restricting the fire without any risk. The passive safety devices, cooling heat exchanger and pressure relief valves, continue to function without electrical power.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n        <\/div>\n\n        <!-- \u2550\u2550 5. AIR & COMBUSTION \u2550\u2550 -->\n        <div class=\"ax-faq-section\" id=\"sec-air\">\n            <div class=\"ax-faq-section-header\">\n                <div class=\"ax-faq-section-icon\"><i class=\"fas fa-wind\"><\/i><\/div>\n                <h2>Air &amp; Combustion<\/h2>\n            <\/div>\n\n            <details class=\"ax-faq-item\" data-num=\"28\"><summary data-num=\"28\">Does the combustion fan burn more wood? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>No, quite the opposite. The fan delivers precisely the right quantity of air for efficient combustion. Without it, airflow depends entirely on chimney draught, which varies constantly. Combined with a flue gas sensor, the fan enables optimal combustion and lower fuel consumption.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"29\"><summary data-num=\"29\">What determines how much air the boiler needs? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Multiple factors: chimney cleanliness, flue gas temperature, external weather conditions (ambient temperature and wind), the quantity of wood loaded, and the amount of ash in the firebox. Continuous control is essential precisely because all these variables change constantly.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"30\"><summary data-num=\"30\">What is chimney draught? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>The upward pull created by the temperature differential between the hot flue gases and the ambient air. It varies significantly with weather, wind, and temperature. When draught is adequate, the Axinar fan remains off and the chimney does the work on its own.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"31\"><summary data-num=\"31\">What is the magnetic damper and what does it do? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>The magnetic damper provides complete control of the air inlet to the boiler. It seals the inlet whenever combustion needs to be restricted or in the event of a power cut. It has no friction surfaces or moving parts that could seize due to heat or combustion residues.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"32\"><summary data-num=\"32\">What is a lambda (\u03bb) sensor? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>It directly measures excess oxygen in the flue gas. In newer Axinar models it was removed: it is an automotive component costing \u20ac300+, and for a 5\u20138% potential fuel saving the risk and replacement cost was found to outweigh the benefit. It has been replaced by a dedicated flue gas temperature sensor.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"33\"><summary data-num=\"33\">What is flue gas recirculation? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>A technique in which a portion of the flue gases is returned to the combustion chamber to reduce emissions. It has no practical application in biomass combustion, do not be swayed by marketing claims to the contrary.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n        <\/div>\n\n        <!-- \u2550\u2550 6. FIREWOOD \u2550\u2550 -->\n        <div class=\"ax-faq-section\" id=\"sec-wood\">\n            <div class=\"ax-faq-section-header\">\n                <div class=\"ax-faq-section-icon\"><i class=\"fas fa-tree\"><\/i><\/div>\n                <h2>Firewood<\/h2>\n            <\/div>\n\n            <details class=\"ax-faq-item\" data-num=\"34\"><summary data-num=\"34\">Should firewood be bought by the cubic metre or by the tonne? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>By the cubic metre. Volume does not change regardless of how dry the wood becomes. Weight does, 10 tonnes of freshly cut wood can shrink to 6 tonnes once dried. Volume is also easy to verify with a tape measure; weight requires a scale.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"35\"><summary data-num=\"35\">How long does firewood need to dry? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>12 to 24 months, depending on the wood species and storage conditions.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"36\"><summary data-num=\"36\">My wood has been stored for 6 months. Is it definitely dry? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Not necessarily. Wood dries like laundry, it needs airflow, warmth, and low humidity. Stored under a staircase in a damp basement it will not dry, regardless of time. A practical rule: do not store wood anywhere you would not hang laundry to dry.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"37\"><summary data-num=\"37\">How should firewood be stored correctly? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>In a shaded, well-ventilated area protected from rain, but not in an enclosed damp space. Firewood needs air circulation to dry, the same rule applies: do not store it anywhere you would not hang laundry to dry.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"38\"><summary data-num=\"38\">What is the correct moisture content for burning? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Below 20% is acceptable; below 16% is ideal. At around 50% moisture content, virtually all the energy in the wood is consumed just evaporating the water it contains, leaving nothing for heating.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"39\"><summary data-num=\"39\">Should I mix dry and wet wood for a longer burn? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Absolutely not. Mixing gives the impression of a longer-lasting fire, creating a false sense of economy. In reality, additional dry wood is being burned simply to evaporate the moisture in the wet wood.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"40\"><summary data-num=\"40\">How do I measure the moisture content of firewood? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>With a wood moisture meter, an inexpensive tool widely available in hardware stores. Two metal pins are inserted into the wood and the meter gives an immediate moisture reading.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n        <\/div>\n\n        <!-- \u2550\u2550 7. PERFORMANCE & EFFICIENCY \u2550\u2550 -->\n        <div class=\"ax-faq-section\" id=\"sec-performance\">\n            <div class=\"ax-faq-section-header\">\n                <div class=\"ax-faq-section-icon\"><i class=\"fas fa-chart-line\"><\/i><\/div>\n                <h2>Performance &amp; Efficiency<\/h2>\n            <\/div>\n\n            <details class=\"ax-faq-item\" data-num=\"41\"><summary data-num=\"41\">Does a cast iron or refractory brick boiler store more heat? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>This is a myth. One litre of water stores 8.4 times more heat than one kilogram of metal. Because the water content represents between one fifth and one third of the boiler's total weight, over 80% of the stored thermal energy resides in the water, not in the metal or the bricks.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"42\"><summary data-num=\"42\">What is a gasification boiler? Is it better? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>A gasification boiler can be up to 20% more efficient, but only when firewood moisture content is below 16%. With higher moisture it may not ignite at all, or it may burn even more wood than a conventional boiler.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"43\"><summary data-num=\"43\">Why does tar build up in the boiler? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Tar condenses on any surface in contact with the flue gas that falls below 63\u00b0C. If the boiler water temperature drops below 55\u00b0C, tar deposits will form inside the combustion chamber.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"44\"><summary data-num=\"44\">How do I prevent tar build-up? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Keep the boiler water temperature above 55\u00b0C at all times. In the Axinar boiler this is achieved automatically by the built-in recirculation valve and the DHW function, no additional components are needed.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"45\"><summary data-num=\"45\">What is the DHW function on the boiler? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>The Domestic Hot Water function. On the Axinar boiler, activating DHW mode keeps the water temperature elevated, simultaneously preventing tar formation in the combustion chamber.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"46\"><summary data-num=\"46\">Does a wood boiler need twice the heat output of an oil boiler? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>No. 30,000 kcal is 30,000 kcal regardless of whether it comes from wood or oil. A certified 60kW wood boiler delivers exactly the same heat output as a 60kW oil boiler.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"47\"><summary data-num=\"47\">How is the heat output of a wood boiler measured? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>According to EN303-5: a 2-hour test at maximum output and a further test at 30% output, both recorded by a calibrated data logger. This standardised methodology applies equally to all European manufacturers.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"48\"><summary data-num=\"48\">What is the efficiency of the Axinar boiler? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>The split combustion chamber design maximises the heat exchange surface area. The water-cooled grate and fully water-cooled interior ensure that the maximum possible proportion of combustion energy is transferred to the water rather than lost through the structure.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"49\"><summary data-num=\"49\">Why did I burn far more wood than expected? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Heat either heats the water or leaves with the flue gas, it does not disappear. The main causes of excessive wood consumption are: incorrect air quantity, poor airflow distribution, tar deposits in the combustion chamber, wet firewood, and incomplete combustion residues.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"50\"><summary data-num=\"50\">How does excess air increase wood consumption? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>When air supply exceeds what combustion requires, the surplus air absorbs useful heat and carries it out of the flue, directly increasing fuel consumption for the same heat output.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"51\"><summary data-num=\"51\">How does poor airflow distribution increase wood consumption? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Even with the correct total air volume, if that air is not well distributed through the fuel bed, incomplete combustion occurs, producing unburnt gases and carbon monoxide. A significant portion of the fuel's energy is wasted.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"52\"><summary data-num=\"52\">How do tar deposits increase wood consumption? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Tar acts as thermal insulation. Once it coats the combustion chamber walls, heat transfer to the water is severely reduced, the temperature difference across the affected surface can reach 20\u00b0C, meaning much more wood is needed for the same heat output.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"53\"><summary data-num=\"53\">How does firewood moisture content affect consumption? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Dramatically. If you buy 1 tonne of wood at 40% moisture content, you are actually buying 600 kg of wood and 400 kg of water. Approximately 100 kg of dry wood will be burned solely to evaporate that water, effectively doubling your consumption compared to properly dried wood.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"54\"><summary data-num=\"54\">What do combustion residues reveal about efficiency? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Perfect combustion leaves only a small amount of fine powdery ash with no unburnt char. If you find charcoal pieces in the ash, combustion is incomplete and fuel is being wasted.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n        <\/div>\n\n        <!-- \u2550\u2550 8. AUTOMATION \u2550\u2550 -->\n        <div class=\"ax-faq-section\" id=\"sec-automation\">\n            <div class=\"ax-faq-section-header\">\n                <div class=\"ax-faq-section-icon\"><i class=\"fas fa-microchip\"><\/i><\/div>\n                <h2>Automation<\/h2>\n            <\/div>\n\n            <details class=\"ax-faq-item\" data-num=\"55\"><summary data-num=\"55\">Can a wood boiler support room thermostats? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Absolutely. With modern electronic control, the Axinar wood boiler offers the same comfort and zoning capability as an oil boiler.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"56\"><summary data-num=\"56\">How does the thermostat control work on the Axinar boiler? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>You set the desired temperature and the boiler's electronic controller maintains it automatically, ramping up the fire when needed and keeping it in a standby ember state when the building is already warm.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"57\"><summary data-num=\"57\">How many zone thermostats can it control? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Up to 4 room thermostats via a zone control panel.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"58\"><summary data-num=\"58\">How does it work alongside an existing oil boiler? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Automatically. When you load and light wood, the oil boiler shuts down without any manual valve operation. When the wood burns out, the oil boiler restarts on its own, completely seamless changeover with no user intervention.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"59\"><summary data-num=\"59\">Is a separate zone control panel needed? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>The boiler's built-in electronics control one pump and one solenoid valve as standard. This is expandable to 4 zones with the zone panel. No additional hydrostat or separate control panel is required, everything is pre-wired and factory-configured.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"60\"><summary data-num=\"60\">What is the ember retention function? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>The user sets how long the boiler maintains a live ember bed between loads (scale 1\u201320). Used correctly, the boiler shuts down completely only 2\u20133 times per winter, eliminating cold re-starts every morning.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"61\"><summary data-num=\"61\">How does the boiler notify me when it needs more wood? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>The wood boiler is manually fed by nature. In practice, a notification offers limited value because the time between loads depends on many variables. Smart notification features marketed by some brands are primarily a sales tool rather than a meaningful practical benefit.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"62\"><summary data-num=\"62\">Does it have antifreeze protection? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Yes. If any room thermostat or the water sensor registers a temperature below 5\u00b0C, the oil boiler is activated automatically to protect the heating system.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n        <\/div>\n\n        <!-- \u2550\u2550 9. INSTALLATION \u2550\u2550 -->\n        <div class=\"ax-faq-section\" id=\"sec-installation\">\n            <div class=\"ax-faq-section-header\">\n                <div class=\"ax-faq-section-icon\"><i class=\"fas fa-wrench\"><\/i><\/div>\n                <h2>Installation<\/h2>\n            <\/div>\n\n            <details class=\"ax-faq-item\" data-num=\"63\"><summary data-num=\"63\">Is it complicated to operate? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>On the contrary, it is straightforward. The user loads the wood, lights it, and closes the door. The boiler's electronic controller handles everything else automatically from that point on.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"64\"><summary data-num=\"64\">Panel radiators or column radiators? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Panel radiators. They are more efficient: less water volume means lower thermal inertia and faster response, higher water velocity means better heat transfer, and a greater surface area per unit volume improves output for the same flow rate.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"65\"><summary data-num=\"65\">What does a correct installation require? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>The minimum requirements are: 2 pressure relief valves, 1 temperature safety valve on the cooling heat exchanger, and a voltage stabiliser. These are also the only conditions required to maintain the Axinar warranty.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"66\"><summary data-num=\"66\">How many connections are required? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>In a dual-boiler installation with an oil boiler: 4 pipe connections and 3 electrical cable connections. All boilers share the same standard connection points, the ancillary components downstream of the boiler are identical across installations.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n        <\/div>\n\n        <!-- \u2550\u2550 10. MAINTENANCE & TROUBLESHOOTING \u2550\u2550 -->\n        <div class=\"ax-faq-section\" id=\"sec-maintenance\">\n            <div class=\"ax-faq-section-header\">\n                <div class=\"ax-faq-section-icon\"><i class=\"fas fa-tools\"><\/i><\/div>\n                <h2>Maintenance &amp; Troubleshooting<\/h2>\n            <\/div>\n\n            <details class=\"ax-faq-item\" data-num=\"67\"><summary data-num=\"67\">What happens if the electronics fail? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>The self-diagnostic system detects problems early. For non-critical faults, a fallback operating mode is available. Even in the event of complete board failure, such as a lightning strike, the circulator pump can be bridged to keep running until a replacement board arrives.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"68\"><summary data-num=\"68\">How often does the ash need to be emptied? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>The ash drawer has a capacity of 34+ litres, sufficient for once-a-week emptying under typical use.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"69\"><summary data-num=\"69\">How easy is the boiler to clean? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Very easy. The internal baffles and combustion chamber geometry of the Axinar boiler are specifically designed for quick, straightforward cleaning access.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"70\"><summary data-num=\"70\">Does it have a self-diagnostic system? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Yes. The controller monitors 14+ operating parameters and displays warning messages before minor issues escalate into failures.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"71\"><summary data-num=\"71\">Does it log operating hours and faults? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Yes. The boiler includes a data logger that records operating history and fault events, facilitating accurate diagnostics and more efficient servicing.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"72\"><summary data-num=\"72\">What is complete combustion? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>When all the fuel burns fully, with no unburnt gases and minimal pollutants, transferring the maximum possible heat energy to the boiler water.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"73\"><summary data-num=\"73\">How can I tell if combustion is complete? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Check the ash. Perfect combustion leaves only a small amount of fine, powder-like ash with absolutely no charcoal pieces. If charcoal is visible in the ash, combustion is incomplete and fuel efficiency is being lost.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n        <\/div>\n\n        <!-- \u2550\u2550 11. PURCHASE & WARRANTY \u2550\u2550 -->\n        <div class=\"ax-faq-section\" id=\"sec-warranty\">\n            <div class=\"ax-faq-section-header\">\n                <div class=\"ax-faq-section-icon\"><i class=\"fas fa-file-contract\"><\/i><\/div>\n                <h2>Purchase &amp; Warranty<\/h2>\n            <\/div>\n\n            <details class=\"ax-faq-item\" data-num=\"74\"><summary data-num=\"74\">What does CE certification actually mean? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>The EN303-5 standard consolidates the collective experience of European boiler manufacturers since 1974. It defines materials, dimensions, welding types, and minimum safety and emissions requirements. CE certification is not optional, it is the baseline guarantee of a reliable product.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"75\"><summary data-num=\"75\">What warranty does the boiler carry? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>By law: 2 years on mechanical components, 1 year on electronics. Axinar covers 100% of warranty costs, shipping, labour, and parts.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"76\"><summary data-num=\"76\">What are the warranty conditions? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Only the minimum installation requirements: 2 pressure relief valves, 1 temperature safety valve on the cooling heat exchanger, and a voltage stabiliser.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"77\"><summary data-num=\"77\">What is the expected service life of the boiler? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Under EN303-5, the design service life is 25 years, provided the installation complies with the standard's requirements.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"78\"><summary data-num=\"78\">Should I buy without VAT to save money? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Under no circumstances. Axinar does not condone illegal business practices. Only a proper fiscal receipt proves the date and place of purchase, without it, you have no legal recourse whatsoever.<\/p><\/div><div class=\"ax-faq-next\" onclick=\"axFaqNext(this)\"><i class=\"fas fa-arrow-down\"><\/i> Next question<\/div><\/details>\n\n            <details class=\"ax-faq-item\" data-num=\"79\"><summary data-num=\"79\">Why do I need a proof of purchase? <span class=\"ax-faq-arrow\"><i class=\"fas fa-chevron-down\"><\/i><\/span><\/summary><div class=\"ax-faq-a-inner\"><p>Every legal claim, defect, compensation, warranty service, begins with the receipt. It is also the owner's responsibility to use a licensed plumber and electrician for installation; without this, courts will not recognise any rights arising from faults.<\/p><\/div><\/details>\n        <\/div>\n\n    <\/div><!-- .ax-faq-content -->\n<\/div><!-- .ax-faq-layout -->\n\n\n<script>\ndocument.addEventListener('DOMContentLoaded', function(){\n    var faqTocLinks = document.querySelectorAll('.ax-faq-toc a');\n    function setTocActive(detailsEl){\n        var section = detailsEl.closest('.ax-faq-section[id]');\n        if(!section) return;\n        faqTocLinks.forEach(function(a){\n            a.classList.remove('ax-toc-active');\n            if(a.getAttribute('href') === '#' + section.id) a.classList.add('ax-toc-active');\n        });\n    }\n    function scrollToItem(el){\n        var top = el.getBoundingClientRect().top + window.pageYOffset - 20;\n        window.scrollTo({top: top, behavior: 'smooth'});\n    }\n    document.querySelectorAll('.ax-faq .ax-faq-item').forEach(function(det){\n        det.addEventListener('toggle', function(){\n            if(this.open){\n                var section = this.closest('.ax-faq-section');\n                if(section){\n                    section.querySelectorAll('.ax-faq-item[open]').forEach(function(d){\n                        if(d !== det) d.removeAttribute('open');\n                    });\n                }\n                setTocActive(this);\n                scrollToItem(this);\n            }\n        });\n    });\n    window.addEventListener('scroll', function(){\n        var faqSections = document.querySelectorAll('.ax-faq-section[id]');\n        var activeId = '';\n        faqSections.forEach(function(sec){\n            if(sec.getBoundingClientRect().top <= 200) activeId = sec.id;\n        });\n        faqTocLinks.forEach(function(a){\n            a.classList.remove('ax-toc-active');\n            if(a.getAttribute('href') === '#' + activeId) a.classList.add('ax-toc-active');\n        });\n    });\n});\nfunction axFaqNext(el){\n    var current = el.closest('.ax-faq-item');\n    var all = Array.from(document.querySelectorAll('.ax-faq .ax-faq-item'));\n    var idx = all.indexOf(current);\n    if(idx < all.length - 1){\n        current.removeAttribute('open');\n        var next = all[idx + 1];\n        next.setAttribute('open','');\n    }\n}\n<\/script>\n\n<\/div><!-- .ax-faq -->\n\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     SEO META BLOCK, FAQ Wood Boilers (EN)\n     \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\n\n<!--\n  Suggested SEO Title:\n  Axinar Wood Boiler FAQ, 79 Technical Questions Answered | Axinar Academy\n\n  Meta Description (\u2248155 chars):\n  Everything about Axinar wood boilers: combustion, hydraulics, safety valves,\n  firewood drying, buffer tanks, automation, and warranty. 79 expert answers.\n-->\n\n<!-- Open Graph -->\n<meta property=\"og:title\" content=\"Axinar Wood Boiler FAQ, 79 Technical Questions Answered\" \/>\n<meta property=\"og:description\" content=\"Everything about Axinar wood boilers: combustion control, hydraulic system, safety, firewood moisture, automation, and warranty. 79 expert technical answers.\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:url\" content=\"https:\/\/axinar.com\/en\/axinar-academy\/faq-wood-boilers\" \/>\n<meta property=\"og:image\" content=\"https:\/\/axinar.com\/wp-content\/uploads\/2025\/05\/kausimo-pellet-lebites-axinar.webp\" \/>\n\n<!-- FAQ Schema -->\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\"@type\":\"Question\",\"name\":\"Why are there no cheap wood boiler options like there are for stoves or heat pumps?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"In boilers, 90% of the cost is raw materials (metals) and only 10% is labour. Metals cost the same worldwide for equivalent quality, which is why there are no cheap options in the boiler market.\"}},\n    {\"@type\":\"Question\",\"name\":\"What are the key advantages of the Axinar wood boiler?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Room thermostat control (like an oil boiler), automatic coordination with the existing oil boiler, a fail-safe magnetic damper, a flue gas sensor for optimal combustion, an ember retention system, and 3 registered patents in combustion control.\"}},\n    {\"@type\":\"Question\",\"name\":\"What steel plate thickness should a boiler have?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"According to EN303-5: 5mm in the combustion chamber, 4mm where only flue gas contacts the surface, and 3mm where only water is in contact.\"}},\n    {\"@type\":\"Question\",\"name\":\"Why are seamless (Mannesmann) pipes used in boilers?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"EN303-5 requires seamless pipes because they withstand alternating thermal loads and corrosive environments. Axinar uses exclusively Mannesmann seamless pipes for long-term reliability.\"}},\n    {\"@type\":\"Question\",\"name\":\"Open or closed expansion vessel, which is better for a wood boiler?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Closed. An open vessel exposes the water to air, causing continuous corrosion. In a closed circuit, corrosion essentially stops after the initial oxygen is consumed. At 3 bar, the water boiling point also rises to 130\u00b0C, providing greater safety margin.\"}},\n    {\"@type\":\"Question\",\"name\":\"Does the Axinar wood boiler need a three-way mixing valve?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. The Axinar boiler has a built-in recirculation bypass with no moving parts, nothing to seize, clog, or maintain. This saves approximately \u20ac100 compared to a conventional three-way valve installation.\"}},\n    {\"@type\":\"Question\",\"name\":\"Does a wood boiler need a buffer tank?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Only when the boiler cannot modulate down to 30% of maximum output, typically gasification boilers, not conventional wood boilers. A buffer tank can save 2\u201320% energy, but a full installation costs \u20ac1,800\u2013\u20ac2,500.\"}},\n    {\"@type\":\"Question\",\"name\":\"How many overheat protection systems does the Axinar boiler have?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Four layers: magnetic damper and recirculation solenoid valve (active\/electronic), plus cooling heat exchanger and pressure relief valves (passive\/mechanical).\"}},\n    {\"@type\":\"Question\",\"name\":\"What happens during a power cut with the Axinar wood boiler?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The magnetic damper closes automatically (fail-safe), cutting off air supply and restricting the fire. The passive safety devices, heat exchanger and pressure relief valves, continue to operate without power.\"}},\n    {\"@type\":\"Question\",\"name\":\"Does the combustion fan burn more firewood?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, quite the opposite. The fan delivers precisely the right air quantity for efficient combustion. Without controlled airflow, combustion depends on variable chimney draught.\"}},\n    {\"@type\":\"Question\",\"name\":\"Should firewood be bought by the cubic metre or by the tonne?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"By the cubic metre. Volume does not change as wood dries, but weight does, 10 tonnes fresh can become 6 tonnes dry. Volume is also easy to verify with a tape measure.\"}},\n    {\"@type\":\"Question\",\"name\":\"How long does firewood need to dry before use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"12 to 24 months depending on the wood species and storage conditions. Wood needs airflow, warmth, and low humidity to dry properly.\"}},\n    {\"@type\":\"Question\",\"name\":\"What is the correct moisture content for firewood?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Below 20% is acceptable; below 16% is ideal. At 50% moisture, virtually all the wood's energy is used just evaporating the water it contains.\"}},\n    {\"@type\":\"Question\",\"name\":\"Why does tar build up in a wood boiler?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Tar condenses on surfaces below 63\u00b0C. If boiler water temperature drops below 55\u00b0C, tar will form in the combustion chamber. Keep water temperature above 55\u00b0C at all times.\"}},\n    {\"@type\":\"Question\",\"name\":\"How many zone thermostats can the Axinar wood boiler control?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Up to 4 room thermostats via a zone control panel. No separate hydrostat or additional wiring is required, everything is pre-configured.\"}},\n    {\"@type\":\"Question\",\"name\":\"How does the Axinar boiler work alongside an existing oil boiler?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Automatically. When wood is loaded and lit, the oil boiler shuts off without any manual valve operation. When the wood burns out, the oil boiler restarts by itself.\"}},\n    {\"@type\":\"Question\",\"name\":\"What is the ember retention function on the Axinar wood boiler?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"A function that keeps a live ember bed between loads (scale 1\u201320). Used correctly, the boiler shuts down completely only 2\u20133 times per winter, avoiding cold re-starts.\"}},\n    {\"@type\":\"Question\",\"name\":\"What warranty does the Axinar wood boiler carry?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"2 years on mechanical components, 1 year on electronics. Axinar covers 100% of warranty costs including shipping, labour, and parts.\"}},\n    {\"@type\":\"Question\",\"name\":\"What is the expected service life of the boiler?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"25 years, according to EN303-5, provided the installation meets the standard's minimum requirements.\"}},\n    {\"@type\":\"Question\",\"name\":\"What does CE certification mean for a wood boiler?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"EN303-5 consolidates European boiler engineering knowledge since 1974, defining materials, dimensions, welding standards, and minimum safety and emissions requirements. It is the baseline guarantee of a reliable, compliant product.\"}}\n  ]\n}\n<\/script>\n\n<!-- \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\n     WPML REFERENCE\n     English Title:  FAQ, Axinar Wood Boilers\n     Slug:           faq-wood-boilers\n     Language code:  en_US\n     \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 -->\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Home \/ Academy \/ FAQ Wood Boilers Axinar Wood Boilers Frequently Asked Questions 79 technical questions and answers about wood [&hellip;]<\/p>\n","protected":false},"author":16,"featured_media":4154,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_eb_attr":"","site-sidebar-layout":"no-sidebar","site-content-layout":"","ast-site-content-layout":"full-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-6399","page","type-page","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/axinar.com\/en\/wp-json\/wp\/v2\/pages\/6399","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/axinar.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/axinar.com\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/axinar.com\/en\/wp-json\/wp\/v2\/users\/16"}],"replies":[{"embeddable":true,"href":"https:\/\/axinar.com\/en\/wp-json\/wp\/v2\/comments?post=6399"}],"version-history":[{"count":2,"href":"https:\/\/axinar.com\/en\/wp-json\/wp\/v2\/pages\/6399\/revisions"}],"predecessor-version":[{"id":7264,"href":"https:\/\/axinar.com\/en\/wp-json\/wp\/v2\/pages\/6399\/revisions\/7264"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/axinar.com\/en\/wp-json\/wp\/v2\/media\/4154"}],"wp:attachment":[{"href":"https:\/\/axinar.com\/en\/wp-json\/wp\/v2\/media?parent=6399"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}