Ground source heat pumps

How it Works

Ground source heating pumps (GSHPs) use pipes that are buried in the garden to extract heat from the ground. This heat can then be used to heat radiators, underfloor or warm air heating systems and hot water in your home.

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 your garden.

Heat from the ground is absorbed into the fluid 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.

The benefits of ground source heat pumps

  • Could lower your fuel bills, especially if you replace conventional electric heating
  • Could provide you with income through the government’s Renewable Heat Incentive (RHI)
  • Could lower home carbon emissions, depending on which fuel you are replacing
  • No fuel deliveries needed
  • Can heat your home as well as your water
  • Minimal maintenance required

Unlike gas and oil boilers, heat pumps deliver heat at lower temperatures over much longer periods.

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