Domestic Ground Source Heat Pumps | Information and costs

Ground Source Heat Pumps

There are two common types of ground source heat pump systems:

1) Horizontal ground loops

A loop of plastic tubing is placed in a shallow trench in the ground, usually in the garden of a home, and a mixture of water and glycol is pumped around the tubing, extracting heat from the ground. This heat can be used to heat your home and produce hot water.

2) Vertical borehole loops

The plastic tube is arranged in a U-shape going downwards into the ground. Boreholes can be anywhere from 15 to 100 meters deep, depending on the heat demand from the house.

The longer the tubing, the more energy the pump is capable of producing. The technology works well with underground heating systems, but also works with conventional central heating systems using radiators.

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Advantages of the technology include:

Once installed, they are unobtrusive and need little maintenance.
As the ground maintains a more constant temperature than the air, the technology is not prone to fluctuations in efficiency in colder weather
There is no need to find space to store fuel
Reductions in heating bills will be seen, especially if they are replacing heating fuels such as oil used by homes off the gas grid.
CO2 emissions will be reduced as the technology uses only a third of the energy of an average existing gas boiler to produce the same amount of heat. Even less environmental impact will be seen if this energy is obtained through another renewable source.
The government has recently proposed the Renewable Heat Incentive to provide a subsidy payment to heat pump users, which could mean a payback time on installation costs of 8 years.
This technology is an eligible measure under the Government’s Green Deal, a loan available for energy-efficient improvements to your home.