| 18 October 2009
Heat pumps transfer heat from the ground or air into a building to provide all space heating and, in some cases, to pre-heat domestic hot water. Ground source heat pumps use a ground loop which can either be buried horizontally in a trench, or vertically in a borehole. Air source heat pumps absorb heat from the air outside to heat buildings.Water source heat pumps are also an option, where a suitable water source is available.
