Adjusting the Heating Curve for Better Comfort and Efficiency
What the heating curve is and how to optimise it for your building
Understanding and adjusting the heating curve
The heating curve (also called the weather compensation curve) determines how warm the water flowing through your radiators or underfloor heating should be at different outdoor temperatures. Getting this right is key to both comfort and efficiency.
How it works
When it's cold outside, the heat pump supplies warmer water to compensate. When it's mild, it supplies cooler water. The heating curve defines this relationship.
A curve that's too high wastes energy by producing hotter water than needed. A curve that's too low means the house stays cold on cold days.
Typical starting points
- Underfloor heating: Flow temperature of 30–35°C at 0°C outdoor temperature
- Low-temperature radiators: Flow temperature of 40–45°C at 0°C outdoor temperature
- Standard radiators: Flow temperature of 50–55°C at 0°C outdoor temperature
How to adjust in the app
- Go to Settings → Heating → Heating curve.
- Adjust the curve up if the house is too cold on cold days.
- Adjust the curve down if the house is consistently too warm or energy consumption seems high.
- Make small changes (one step at a time) and wait 24 hours to see the effect before adjusting again.
When to call an installer
If you're unsure about the right settings for your building, ask your installer to optimise the heating curve during a service visit. This is especially recommended after a new installation or if you've made significant changes to the building (e.g. added insulation or replaced radiators).