Ground Source Heat Pumps - Frequently Asked Questions for UK Homeowners

What is a Ground Source Heat Pump?

A ground source heat pump (GSHP) is a renewable heating system that extracts natural heat from the ground and uses it to heat your home and hot water. Even in winter, the ground stores solar energy at a stable temperature, making it an efficient heat source year-round.

How Does a Ground Source Heat Pump Work?

A loop of pipes is buried in the ground. A fluid circulates through these pipes and absorbs heat from the soil. The heat pump then compresses this heat to a higher temperature and transfers it into your home’s heating system.

Think of it as a refrigerator working in reverse.

Are Ground Source Heat Pumps Efficient?

Yes. Ground source heat pumps can achieve efficiencies of 300–400%. That means for every 1 unit of electricity used, you can get 3–4 units of heat.

They are among the most energy-efficient heating solutions available in the UK.

How much does a Ground Source Heat Pump Cost in the UK?

A typical ground source heat pump installation costs £18,000-£35,000 depending on property size and ground loop type. With the £7,500 BUS grant, this reduces to £10,500-£27,500. While higher than air source, the greater efficiency and longer lifespan often make GSHP more cost-effective over time. Use our free estimate calculator for an accurate quote.

Cost will always depend on:

• Property size

• Ground conditions

• Type of ground loop (horizontal or borehole)

• Existing heating system

While upfront costs are higher than gas boilers, long-term savings and grants can significantly offset this.

Are There Government Grants For Ground Source Heat Pumps?

Yes. UK homeowners may be eligible for the Boiler Upgrade Scheme (BUS), which offers grants towards installation.

Only MCS registered installers like Thermal Earth are able to install under the grant scheme - we will guide you through eligibility and applications.

Do I Need a Large Garden?

Not always. There are two main options:

Horizontal loops – require more surface area

Vertical boreholes – ideal for smaller gardens

A site survey determines the best solution.

How Long do Ground Source Heat Pumps Last?

• Heat pump unit: 20–25 years

• Ground loops: 50+ years

This makes GSHPs a long-term investment. Regula care and servicing will increase the life of your GSHP. 

Find out more about our comfort care plan

Are they Suitable for Older Homes?

Yes, especially when paired with:

• Good insulation

• Underfloor heating

• Larger radiators

Older homes may need upgrades for best performance.