Air-to-water or ground-source: which heat pump suits your home?
One pulls heat from the outdoor air, the other from the earth beneath the garden. The difference shows on the coldest day of the year.
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Heat Pumps
A heat pump turns one kilowatt hour of electricity into three to five kilowatt hours of heat. How close you get to the upper end depends less on the brand than on the flow temperature your home needs.
3 to 4typical seasonal performance of air-to-water units at low flow temperatures
4 to 5typical seasonal performance of ground-source systems
2 to 3 %efficiency gained per degree of lower flow temperature, a rule of thumb
Guides in Heat Pumps
Heat pumps in older homes: flow temperature is the number that decides
Whether a heat pump works in a 1930s villa is rarely a question of the building's age. It is a question of how hot the radiators need to be.
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