Frequently Asked Questions

It is a standalone room thermostat designed for both residential and commercial use. It delivers advanced heating and cooling control with straightforward operation through just three buttons.

For users who want reliable temperature control without complex automation, without an internet connection, and without programming. The Axinar thermostat works right out of the box.

Yes. The thermostat can operate in both heating and cooling mode, selectable directly from the menu. It is compatible with boilers, heat pumps, fan coils, and most standard HVAC systems.

No. The Axinar thermostat operates fully autonomously — no Wi-Fi, no app, no cloud dependency.

In Greece. Design, manufacturing, assembly, and plastic housing production are carried out entirely at our facilities. Every Axinar thermostat is made in-house.

2 years.

• Heating and cooling mode
• Domestic hot water (DHW) function
• Antifreeze protection
• Sleep mode (automatic nighttime temperature setback)
• Keypad lock
• Year-round room thermometer function

The Axinar thermostat is a true plug-and-play device. All functions and parameters come pre-configured from the factory — just wire it up and it is ready to use.

No special configuration is required. If desired, you can fine-tune individual parameters from the menu to match your specific installation.

Yes. After wiring, the thermostat is immediately operational with factory-optimized settings that suit the vast majority of heating and cooling installations.

2 × AAA batteries, any brand or quality. Higher-quality batteries will naturally provide a longer service life.

Depending on usage, batteries can last up to 2 years. The thermostat is specifically engineered for ultra-low power consumption to maximise battery life.

A low battery indicator appears on the LCD display as soon as the voltage drops below a safety threshold.

Approximately one month. The thermostat continues to operate normally after the warning, giving you plenty of time to replace the batteries.

No. All settings are stored in non-volatile memory and are retained indefinitely, regardless of how long the thermostat remains without batteries. If the swap takes less than 30 seconds, the display does not even turn off.

It features a built-in voltmeter that continuously measures battery voltage — even during relay activation. The current voltage is displayed in the menu or whenever fresh batteries are inserted.

Internal calculations are performed with a resolution of 0.1°C for precise thermostat control.

The display shows temperature in 0.5°C increments for easy, at-a-glance reading.

Every unit is calibrated against a certified reference thermometer. Measurement accuracy exceeds what is required for residential thermostat applications.

Mounting location is the main factor: avoid placing the thermostat near a window, radiator, or any spot exposed to direct sunlight, as these can produce incorrect readings.

Yes. The menu includes a temperature offset adjustment so you can align the displayed value with the actual room temperature as measured by an independent reference.

From −4°C to +4°C.

The differential is the temperature band around the set point within which the heating (or cooling) system cycles on and off. For example, with a set point of 23°C and a differential of 0.5°C, heating turns on at 22.75°C and turns off at 23.25°C.

The differential determines how stable the room temperature remains. A smaller differential means smaller temperature swings and better thermal comfort throughout the day.

0.5°C. This provides a good balance between thermal comfort and burner cycle frequency for most installations.

From 0.1°C to 1°C, allowing fine-tuning to suit the specific characteristics of each heating or cooling installation.

With a narrower differential, the room temperature stays closer to the set point. This means the same comfort level can be achieved at a lower set temperature, which also contributes to energy savings.

Hysteresis refers to the delay between the thermostat sending a heat demand signal and hot water actually arriving at the radiators. This lag can cause overshooting of the set temperature.

Thermal inertia occurs when radiators contain a large volume of water and continue releasing heat into the room even after the boiler has shut off, causing the temperature to overshoot the set point.

The thermostat continuously monitors the deviation between the desired and actual room temperature. Once it detects a consistent deviation pattern over at least 10 operating cycles, it automatically adjusts its internal differential to compensate. The result is more precise temperature control without any manual intervention.

Approximately 2 days for the initial learning phase. After that, the thermostat continues to refine its behaviour as conditions change.

PID systems require individual tuning for each specific installation. Every home has unique characteristics — room size, radiator volume, insulation level — as well as dynamic disturbances such as open windows, fireplaces, or varying occupancy, all of which can destabilise a fixed PID controller.

• Automatically adapts to the thermal characteristics of each individual room
• Handles sudden disturbances (open windows, extra heat sources) without instability
• Delivers consistently stable temperature control over the long term without any manual tuning

Sleep mode automatically lowers the heating set point (or raises the cooling set point) to save energy while you sleep, without any manual intervention.

The thermostat has a built-in ambient light sensor. It detects when the lights in the room are turned off.

After 30 consecutive minutes of darkness. While counting down, a clock symbol is displayed on screen to indicate standby.

When light is detected for 2 consecutive minutes. The thermostat immediately resumes normal operation and returns to the standard set point.

From 1 to 5°C, depending on the configured setting.

A clock symbol displayed below the °C symbol.

Enabled, with a 1°C temperature setback.

Pressing the DHW button activates the hot water production cycle for a preset duration, or until you manually deactivate it.

Two versions: a single-relay version with smart DHW logic, and a dual-relay version for fully independent control of space heating and domestic hot water.

In single-zone installations where heating and DHW share the same circuit, the thermostat forces the boiler on for the preset DHW duration — even if the room is already at the set temperature. This eliminates the old workaround of physically cooling the thermostat just to trigger a DHW cycle.

Yes. You can set any duration up to 60 minutes, disable the timer entirely, or configure it for unlimited runtime with manual deactivation.

20 minutes.

The thermostat automatically shuts off the DHW cycle after the preset time expires, preventing unnecessary energy waste.

Yes. The thermostat automatically activates heating to protect the system from freezing, even when the unit is in standby.

Protection activates when room temperature drops below 5°C and maintains the temperature at 8°C until the risk passes.

Particularly useful for holiday homes or properties left unoccupied in winter. If the boiler is active, it operates normally. If the heating system is switched off, only the circulator pump can be triggered to prevent pipe freezing.

To prevent accidental setting changes — particularly useful in homes with young children.

Press and hold the DHW button and the DOWN button simultaneously.

A padlock symbol displayed below the decimal digit of the temperature reading.

Yes. Full thermostat function continues uninterrupted; only button input is disabled.

Designed for hotels, serviced apartments, and Airbnb properties. Hotel Mode locks the thermostat within a defined temperature range, preventing guests from setting temperatures outside the permitted limits.

Guests can only adjust the temperature within the pre-configured min/max limits and have access only to MENU 1 (heating or cooling mode selection).

Yes. MENU 1 remains accessible for mode selection.

No. The keypad lock is automatically released after 10 seconds in Hotel Mode, so guests can still interact with the thermostat within the allowed range.

The thermostat can display a modified temperature reading calibrated to enhance the guest's perceived comfort, in line with hospitality best practices.

Yes. The same configured limits apply in both modes.

Through three core mechanisms: a narrow differential for tighter temperature control, automatic adaptation to room thermal inertia, and automatic nighttime temperature setback via sleep mode.

When the temperature is held more consistently close to the set point, the same level of thermal comfort is achieved at a lower set temperature — directly reducing heating demand.

It automatically reduces heating demand during the night without any user action — one of the most effective and effortless ways to cut heating bills.

A high-clarity, high-contrast LCD display, engineered for excellent readability in all lighting conditions — from bright rooms to near-darkness.

Yes. A flame icon appears when heating is active; a snowflake icon appears when cooling is active. The thermostat has no distracting LEDs or additional light indicators.

The relay produces a familiar "click" sound when it engages — just like a traditional bimetallic thermostat. Many users, especially those accustomed to older thermostats, find this reassuring audible confirmation helpful.

Up to 6 metres for users with normal eyesight.

135° horizontal and 90° vertical.

Flame-retardant ABS plastic with enhanced UV stabilisation to resist discolouration over time.

The UV-stabilised ABS significantly delays colour change, even in positions with prolonged direct sunlight exposure.

Every 30 seconds during normal operation, or immediately upon pressing any button.

Outside the heating and cooling season, it functions as a precise room thermometer year-round. The large, high-contrast display and high measurement accuracy make it a genuinely useful wall instrument even when the heating system is off.