Air and ground source heat pumps extract the natural and renewable heat from the air, or ground.
There is a trade off in that heat pumps require electricity to run, but the amount of heat they produce to provide hot water, heat radiators or underfloor heating far out ways this in terms of reduced energy bills.
Heat pumps deliver heat at a lower temperature and so in winter may need to be constantly turned on. In their favour however, is the fact that radiators will be less likely to become seriously hot to the touch, a worry in every house hold with young or elderly occupants.
Ground source heat pumps are made up of a loop of pipe which is buried vertically or horizontally in the earth. A fluid containing antifreeze circulates through the pipes absorbing heat from the ground and transmits it via a heat exchanger to the heat pump. The length of ground pipes depends on the requirements of your home and the amount of heat you require.
Air Source heat pumps are easier to install than ground source, mainly comprising of a cabinet like structure on the outside of a building, preferably on a sunny wall with plenty of space around them. They can extract heat from the air even at temperatures as low as -15 degrees centigrade.
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