WHAT ARE GROUND SOURCE HEAT PUMPS?
Ground source heat pumps use pipes buried in the garden to extract heat from the ground. This can then be used to heat radiators, water and underfloor heating systems in your home. Ground source heat pumps circulate a mixture of water and antifreeze around a loop of pipe absorbing heat from the ground and then passes through a heat exchanger into the heat pump. The ground stays at a fairly constant temperature under the surface, so the heat pump can be used throughout the year.
The length of the ground loop depends on the size of your home and the amount of heat you need. Longer loops can draw more heat from the ground, but need more space to be buried in. If space is limited, a vertical borehole can be drilled instead. Normally the loop is laid flat or coiled in trenches about two metres deep, but if there is not enough space in your garden you can install a vertical loop down into the ground to a depth of up to 100 metres for a typical domestic home.