Ground Source Heat Pump Advice & Installation Support

Ground source heat pumps (GSHPs) can be highly efficient but are far more sensitive to property and site conditions than air source. EvoHome Improvements helps homeowners across Hampshire and the South think through whether a GSHP is realistically appropriate — available land for horizontal slinkies or budget for borehole drilling, ground conditions, existing insulation, emitter sizing (oversized radiators or underfloor heating), hot water demand and electrical supply.

We also help homeowners understand grant routes such as the Boiler Upgrade Scheme without guaranteeing eligibility, payback or running costs. EvoHome Improvements advises and coordinates — independent vetted MCS-accredited GSHP specialists carry out the design, heat-loss assessment and physical installation. We do not quote fixed prices or guaranteed outcomes without a full survey.

Ground source heat pumps (GSHPs) are the most efficient heating technology available for UK homes, achieving coefficients of performance (COP) of 4.0–5.0 — meaning every 1kW of electricity produces 4–5kW of heat. While installation costs are higher than air source alternatives, GSHPs offer superior efficiency, longer lifespans, and near-silent operation.

\n\n## How Ground Source Heat Pumps Work\n\nGSHPs extract heat from the ground via buried pipe loops filled with a water-glycol mixture. At depths of 1.2m or more, ground temperature in the UK remains stable at 10–13°C year-round, providing consistent heat even in the coldest winters. This stability is the key advantage over air source systems.

\n\n## Ground Loop Options\n\nHorizontal loops require trenches 1.2–2m deep across a garden area roughly 2–3 times the property's floor area. Vertical boreholes (100–200m deep) need far less surface area but cost more to drill. In Hampshire, the chalk and clay geology generally suits both approaches, though site-specific surveys are essential.

\n\n## Financial Incentives\n\nThe Boiler Upgrade Scheme (BUS) offers £7,500 towards GSHP installation costs. Combined with reduced running costs (typically 40–60% lower than gas), most systems pay back within 8–12 years. MCS certification is mandatory for grant eligibility.\n\n## Integration with Existing Homes\n\nGSHPs work best with underfloor heating or oversized radiators due to their lower flow temperatures (35–45°C vs 60–80°C for boilers).

A fabric-first approach — improving insulation before installing a heat pump — maximises efficiency and comfort.