How much does a ground source heat pump cost to install UK?

A ground source heat pump (GSHP) typically costs £15,000–£35,000 to install in the UK, depending on the system size, ground conditions, and property type. The Boiler Upgrade Scheme (BUS) grant covers £7,500 of the cost. After the grant, you'd typically pay £7,500–£27,500. Horizontal loop systems (trenches) are cheaper than vertical boreholes.

Are ground source heat pumps worth it UK?

For many homes — especially larger, well-insulated properties — GSHPs can significantly reduce heating bills and carbon emissions. They're more efficient than air source heat pumps (COP of 3.5–4.5 vs 2.5–3.5), especially in cold weather. They're best suited to homes with outdoor space for ground loops and adequate insulation. The high upfront cost is the main barrier.

How much do ground source heat pumps save on energy bills?

A GSHP can save £300–£1,500+ per year compared to gas boilers, depending on insulation, home size, and current heating system. Replacing oil or LPG heating offers the biggest savings. With a COP of 3.5–4.5, for every 1kW of electricity used, you get 3.5–4.5kW of heat — making it 3.5–4.5 times more efficient than a direct electric heater.

What is the BUS grant for ground source heat pumps?

The Boiler Upgrade Scheme (BUS) provides a £7,500 grant towards the cost of a ground source heat pump in England and Wales. The grant is applied directly by the installer, so you pay the reduced amount. You must own the property, have an existing heating system being replaced, and have a valid EPC. The scheme runs until March 2028.

Ground Source Heat Pumps UK — Costs, Grants, Savings, and How They Work | PocketWise

Ground source heat pumps (GSHPs) are one of the most efficient ways to heat a home — extracting heat from the ground to provide heating and hot water. They cost more to install than air source alternatives, but they’re more efficient and quieter.

How Ground Source Heat Pumps Work

Component	What it does
Ground loop	Pipes buried underground that absorb heat from the earth
Heat pump unit	Compresses the absorbed heat to usable temperatures
Distribution system	Underfloor heating or radiators to heat your home
Hot water cylinder	Stores heated water for taps and showers

The ground stays at a relatively constant 10–13°C year-round below a few metres depth, making it a reliable heat source even in winter.

Types of Ground Loop

Type	How it works	Space needed	Cost
Horizontal loop	Pipes laid in trenches (1–2m deep)	Large garden — typically 2x the floor area	Cheaper (£10,000–£20,000 for loops)
Vertical borehole	Pipes in deep boreholes (50–200m)	Small footprint — can work with limited space	More expensive (£15,000–£30,000 for boreholes)
Pond/lake loop	Pipes submerged in a body of water	Requires a suitable body of water	Variable

Costs

Cost element	Typical range
Heat pump unit	£5,000 – £10,000
Ground loops (horizontal)	£5,000 – £10,000
Ground loops (borehole)	£10,000 – £20,000
Installation and plumbing	£3,000 – £6,000
Underfloor heating (if needed)	£3,000 – £8,000
Hot water cylinder	£500 – £1,500
Total (horizontal)	£15,000 – £28,000
Total (borehole)	£20,000 – £35,000
After BUS grant (£7,500)	£7,500 – £27,500

BUS Grant (Boiler Upgrade Scheme)

Detail	Information
Grant amount	£7,500 (ground source)
Available in	England and Wales
Runs until	March 2028
Who can apply	Homeowners (not new builds)
Requirements	Valid EPC, replacing existing heating, MCS-certified installer
How it works	Installer applies directly — you pay the reduced price
Air source grant	£7,500 (same amount since 2024 increase)

Running Costs

Heating system	Annual cost (3-bed detached)
Ground source heat pump	£600 – £1,200
Air source heat pump	£700 – £1,400
Gas boiler	£800 – £1,400
Oil boiler	£1,200 – £2,000
LPG boiler	£1,500 – £2,500
Electric storage heaters	£1,800 – £3,000
Direct electric heating	£2,500 – £4,000+

COP (Coefficient of Performance)

System	Typical COP	What it means
Ground source heat pump	3.5 – 4.5	£1 of electricity produces £3.50–£4.50 of heat
Air source heat pump	2.5 – 3.5	£1 of electricity produces £2.50–£3.50 of heat
Gas boiler	0.9	£1 of gas produces 90p of heat
Direct electric heater	1.0	£1 of electricity produces £1 of heat

GSHPs maintain high efficiency even in cold weather because ground temperature stays constant — unlike air source pumps that lose efficiency when it’s coldest.

Annual Savings

Replacing	Estimated annual saving
Gas boiler	£200 – £600
Oil boiler	£500 – £1,200
LPG boiler	£700 – £1,500
Electric storage heaters	£1,000 – £2,000
Direct electric	£1,500 – £2,500+

Payback Period

Scenario	Upfront (after BUS)	Annual saving	Payback
Replacing gas boiler (horizontal)	£10,000	£400	~25 years
Replacing oil boiler (horizontal)	£10,000	£800	~12 years
Replacing LPG (horizontal)	£10,000	£1,100	~9 years
Replacing electric heating (horizontal)	£10,000	£1,500	~7 years

Payback is fastest when replacing expensive fuels (oil, LPG, electric) and when combined with solar PV.

Is Your Home Suitable?

Requirement	Detail
Outdoor space	Horizontal: garden 2x floor area. Borehole: much less
Insulation	Well-insulated homes benefit most. EPC C or above ideal
Heat distribution	Underfloor heating is best; larger radiators work too
Garden access	Digger access needed for trenching
Ground conditions	Rocky ground is harder/more expensive
Planning permission	Usually permitted development, but check

Best For

Situation	Why
Rural homes off the gas network	Replacing oil/LPG saves most
New builds	Easy to install during construction
Large, well-insulated homes	Maximum efficiency and savings
Homes with space for ground loops	Cheaper horizontal installations
People planning to stay long-term	Payback requires time

Not Ideal For

Situation	Why
Small properties with no garden	Need space for ground loops or boreholes
Poorly insulated homes	Must insulate first — heat pump output is lower temperature
Short-term residents	May not recoup investment
Tight budgets	Significant upfront cost even with grant

GSHP vs ASHP (Air Source)

Feature	Ground source	Air source
Efficiency (COP)	3.5–4.5	2.5–3.5
Winter efficiency	Stays high	Drops in cold weather
Installation cost	£15,000–£35,000	£8,000–£15,000
BUS grant	£7,500	£7,500
Running costs	Lower	Higher
Noise	Silent	Outdoor fan noise
Space needed	Large garden or borehole	Small outdoor unit
Maintenance	Minimal	Minimal
Lifespan	20–25+ years	15–20 years
Visual impact	None (underground)	External unit visible

Maintenance

Task	Frequency	Cost
Annual service	Yearly	£100 – £200
Antifreeze check (ground loops)	Every 5 years	Included in service
System pressure check	Annually	Included in service
Major repair (compressor)	Rare (10-15 years)	£1,000 – £2,500

GSHPs are generally low-maintenance. The ground loops have no moving parts and can last 50+ years.

Summary

Feature	Detail
Installation cost	£15,000 – £35,000
BUS grant	£7,500
Annual running cost	£600 – £1,200
COP efficiency	3.5 – 4.5
Best for	Off-grid homes, replacing oil/LPG, good insulation, space for loops
Payback	7–25 years depending on current heating
Lifespan	20–25+ years (loops 50+ years)
Maintenance	£100–£200/year service

Ground Source Heat Pumps UK — Costs, Grants, Savings, and How They Work