Flow temperature explained
See how water temperature affects efficiency and radiator output.
Heat-pump efficiency
Good
Radiator output vs a boiler
About 37%
Larger radiators or insulation
Sometimes
A common heat-pump setting. Efficient, but some radiators may need to be bigger than with a boiler.
Radiator output uses the standard method for how output changes with water temperature, compared with about 70°C from a boiler. We don't show exact efficiency figures because they depend on the heat pump and the weather.