If you have a 100 sqm residence and are considering a pellet boiler, the first question is always the same, “how many kW do I need?”. The answer depends on insulation, climate zone, ceiling height, and whether you need domestic hot water. Below is a realistic picture and the AXINAR models that have proven themselves in thousands of installations in similar homes.
How Many kW You Need for 100 sqm
The basic rule for Greece ranges from 0.08 to 0.15 kW per square meter, depending on insulation and zone. For 100 sqm this translates to:
| Building characteristics | Required Power |
|---|---|
| Good insulation (post-2010 construction), Zone A–B | 10–13 kW |
| Medium insulation (1990–2010), Zone B | 13–17 kW |
| Older construction, Zone C–D (Northern Greece, mountainous) | 17–22 kW |
If you add domestic hot water (120–200L tank), add 3–5 kW to the estimate.
Recommended AXINAR Models for 100 sqm
1. AXINAR Calos CL8-32, Flexible 8–32 kW Solution
Our most flexible model for homes that may change needs in the future, adding a boiler tank, changing insulation, new zone. Works excellently on 100 sqm under any conditions.
- Automatic power adjustment 8–32 kW on demand
- All-in-one unit (boiler, control, cleaning)
- Integrated automatic auger cleaning
2. AXINAR PELIT PL20, Classic 20 kW Option
Our most popular model for homes of 90–130 sqm with medium insulation. Proven in thousands of installations across Greece.
- Nominal power 20 kW
- Multi-pass flue gas, efficiency >92%
- Automatic auger cleaning, Axistat thermostat
3. AXINAR PelletWork PW20, Integrated System 20 kW
If you want quick installation without multiple purchases and connections, PelletWork PW20 brings everything into one unified unit.
- Boiler + DHW tank + circulators + control panel
- Compact, fits small boiler rooms
- Single warranty covering all components
Indicative Annual Pellet Consumption
For a 100 sqm residence with medium insulation in Greece, typical consumption ranges:
- Zone A (Athens, Patras, Crete): 700–900 kg/year
- Zone B (Northern Peloponnese, Thessaly): 900–1,150 kg/year
- Zone C (Thessaloniki, Central Macedonia): 1,100–1,400 kg/year
- Zone D (Western/Eastern Macedonia, mountainous Epirus): 1,400–1,800 kg/year
These are indicative. Actual consumption depends on room temperature setting, usage duration, and pellet quality (ENplus A1 certified has a stable 4.8 kWh/kg).
What You Need to Know Before Buying
- Installation space: You need a boiler room or ventilated outdoor space of ~2×2m for the boiler plus additional space for the pellet storage tank (external or internal).
- Chimney: Stainless steel or concrete tube Ø150mm for most models, with mechanical ventilation.
- Heating network: Compatible with radiators, underfloor heating, or fan coils. Underfloor needs a mixing valve for correct inlet temperature.
- Automatic cleaning: Choose a model with automatic auger cleaning, minimizes maintenance to 1–2 times per season.
Need Specialized Advice for Your Specific Case?
Send us the basics of your setup and we’ll get back within 24 hours with a specific model recommendation and indicative installation cost.
Want to see in detail how boiler power is calculated per square meter, with tables and real examples from 85 to 320 sqm? Read the complete boiler selection guide.
