Air Source vs Ground Source Heat Pumps

Choosing the Right Heat Pump

As the UK transitions away from gas boilers, heat pumps are becoming the standard for home heating. But should you choose an Air Source Heat Pump (ASHP) or a Ground Source Heat Pump (GSHP)? Here is a breakdown of the key differences.

Air Source Heat Pumps (ASHP)

ASHPs extract heat from the outside air. They look similar to an air conditioning unit and are placed outside your home.

• Cost: Typically £10,000 to £14,000 before grants.
• Installation: Relatively straightforward and quick (1-3 days). Suitable for most properties with a bit of outdoor space.
• Efficiency: Highly efficient (300% to 400%), though efficiency drops slightly in extreme cold.
• Grant: Eligible for the £7,500 Boiler Upgrade Scheme grant.

Ground Source Heat Pumps (GSHP)

GSHPs extract heat from the ground via a network of buried pipes. The ground maintains a constant temperature year-round.

• Cost: Considerably more expensive, typically £20,000 to £35,000 before grants.
• Installation: Major earthworks required. You need a large garden for horizontal trenches or deep boreholes for vertical systems.
• Efficiency: Extremely high and consistent year-round (400%+), as ground temperatures don't fluctuate like air temperatures.
• Grant: Also eligible for the £7,500 Boiler Upgrade Scheme grant.

Which is Better?

For 90% of UK homes, an Air Source Heat Pump is the most practical and cost-effective choice. Ground Source Heat Pumps are generally reserved for new builds with substantial land, or large rural properties undertaking major renovations. Open Energy Services can connect you with specialists to survey your property and recommend the best system.