Weather compensation
Weather compensation lets the outdoor temperature set the heating water temperature: warm water on a mild day, hotter water on a cold one. For a heat pump it is one of the most effective efficiency settings available.
The heating curve
A heating curve links outdoor temperature to flow temperature. It passes through two points: the design flow temperature at the design outdoor temperature (for example 35 °C at −5 °C for an underfloor system) and a low flow temperature on a mild day. Between those points the controller interpolates.
Why it saves energy
Most heating hours happen on mild days. With a fixed flow temperature the heat pump would produce design-day water all season. With compensation it produces cooler water most of the time, which reduces the temperature lift and raises the COP.
Setting it up
Start from the design values from the heat-loss calculation, then adjust in small steps: if rooms are cold on cold days, raise the cold end of the curve; if they are warm on mild days, lower the mild end. Hydraulic balancing has to be correct first, otherwise the curve compensates for a distribution problem.
On the RV series
Ask our engineers to confirm the RV controller's heating-curve options for your emitters before you order.
Related: Underfloor heating · Low-temperature radiators
Talk to an engineer about your project
Send the building details, location and the emitters you plan to use. We come back with a model proposal and a quotation.