Ground Source Heat pumps can be installed in most of the UK and Ireland, using a borehole or shallow trenches or, by taking heat from a pond or lake.

Heat collecting pipes (like a slincky) in a closed loop, containing water (with a little antifreeze) are used to extract this stored energy, which can then be used to for heating and domestic hot water.

In some applications, the pump can be reversed in summer to provide an element of cooling.