How Much Weather-Compensated Control Saves: A Worked Example
Weather-compensated control lowers the water temperature when the outside temperature rises. Using a 150 m² house as an example, we calculate how much this saves over an entire heating season.
A conventional thermostat fires the boiler «at full power» and switches it off when the set temperature is reached. Weather-compensated control works more subtly: it continuously adjusts the supply temperature to the outdoor temperature according to a «heating curve».
Why it saves energy
The lower the average water temperature over the season, the higher the boiler efficiency (especially for condensing boilers) and the lower the heat losses from the pipework. During transitional periods, the boiler maintains 40–45 °C instead of 70 °C.
Calculation for a 150 m² house
Seasonal gas consumption without weather compensation — approximately 2,200 m³. Switching to weather-compensated control yields 10–20 % savings — that is 220–440 m³ of gas per season. The controller pays for itself within one to two heating seasons.
What is needed
- A weather-compensated controller and an outdoor sensor.
- For multi-circuit systems — pump groups with mixing valves and actuators.
- The actuator-controller A-413 for automatic temperature maintenance in individual circuits.
Termojet automation controls both the boiler and individual circuits, maintaining separate heating curves for underfloor heating and radiators. This is especially advantageous in combination with a heat pump, where every degree reduction in supply temperature translates directly into a gain in efficiency.
