Ground source heat pumps work by absorbing natural heat energy from the ground to provide space heating and hot water.

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A system of pipes is run underground in the form of horizontal loops or vertical boreholes, through which a mix of water and antifreeze is pumped. The liquid absorbs the natural heat from the ground, is compressed and then passes through a heat exchanger, which is powered by electricity. This is used to heat water which is then used via your heating system and hot water. 

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As with air source heat pumps, ground source heat pumps are more efficient when producing water at lower temperatures – this makes them ideal solutions for homes with underfloor heating, but also work with conventional radiator systems.