A ground source heat pump circulates a mixture of water and antifreeze around a loop of pipe called a ground loop, which is buried in the garden. Heat from the ground is absorbed into this fluid and is pumped through a heat exchanger in the heat pump. Low grade heat passes through the heat pump compressor and is concentrated into a higher temperature that is capable of heating water for the heating and hot water circuits of the house. After circulation, the cooler fluid passes back through the loop into the ground where it absorbs further energy from the ground in a continuous process while heating is required.
Is it suitable for me?
Your garden doesn’t have to be particularly large, but the ground needs to be suitable for digging a trench or a borehole and accessible to digging machinery.
Since ground source heat pumps produce a lower temperature heat than traditional boilers, it’s essential that your home is well insulated and draught proofed to ensure maximum effectiveness of the heating system.
Underfloor heating systems, larger radiators or low temperature fan convectors (warm air heating), perform better than standard radiator-based systems because of the lower water temperatures required.