Ground Source Heat Pump Cost

A ground source heat pump costs more than £10,000 to install, according to official guidance, and independent guidance puts the figure far higher: the Energy Saving Trust range cited by Uswitch is £28,000 to £57,000, depending on whether trenches or a borehole are used to lay the ground loop¹. The gap between those two numbers is the whole story of ground source pricing. The heat pump itself is a box; the cost is the ground.

Official statistics give a median upfront cost of around £20,000 for ground and water source heat pumps in the UK, against around £10,500 for air-to-water³. That is the comparison that matters for a household weighing the two technologies, and it is a 2021 figure.

The Boiler Upgrade Scheme softens the number rather than transforming it. A ground source heat pump attracts £7,500 off the cost and installation, and an eligible off-gas-grid property replacing oil or liquefied petroleum gas attracts £9,000⁴. Both are upfront discounts applied through the installer, not cheques.

What a ground source heat pump costs in the UK

The published figures do not agree, and the disagreement is informative rather than a problem to be resolved. Croydon Council's retrofit guidance gives a single headline: cost more than £10,000¹. The Energy Saving Trust range reported by Uswitch runs from £28,000 to £57,000, and the variable it names is the ground loop: trenches or a borehole². Government statistics sit between the two, at a median upfront cost of around £20,000 for ground and water source heat pumps in 2021³.

The reason for the spread is that a ground source installation is two projects. The first is the collector: horizontal trenches dug across a garden, or one or more vertical boreholes drilled where land is short. The second is the heat pump, the cylinder, the pipework and the electrical connection inside the house. A trench is cheap per metre and needs space; a borehole is expensive per metre and needs almost none. That single choice moves the total more than any brand decision.

Ground conditions add a second layer. Rock, made ground, archaeology, services and water table all affect drilling time and cost, and none of them are visible before a survey. Access matters too: a drilling rig needs a route to the loop field, and a narrow side return or a terraced back garden can rule out a borehole rig entirely.

For a household, the practical expectation is that a ground source quote will be installer-specific in a way an air source quote is not. There is no published UK price list that covers the groundworks, because the groundworks are priced per site. What the published figures give is the order of magnitude and the reason for the range, not a budget line.

The £7,500 grant, and the £9,000 off-gas-grid uplift

The Boiler Upgrade Scheme provides upfront capital grants towards the cost of installing approved heat pumps, and it is administered by Ofgem⁸. For a ground source heat pump the standard grant value is £7,500 off the cost and installation, and that figure covers water source heat pumps and those on shared ground loops as well⁴.

Where the property is off the gas grid and the heating system being replaced runs on oil or liquefied petroleum gas, the grant rises to £9,000⁵. Ofgem's installer guidance sets out the uplifted value explicitly, and the uplifted grant applies to applications properly made on or after 21 July 2026⁶.

The scheme opened on 23 May 2022 and closes on 30 December 2029⁴. As of 28 April 2026 it has been extended to 2030⁶. The £7,500 level itself is not new: the grant for air source and ground source heat pumps was increased to £7,500 from 23 October 2023, having previously been £5,000 and £6,000 respectively¹⁰.

One point of disagreement sits in the published material. Uswitch reports the scheme as offering homeowners up to £6,000 to install a ground source heat pump in place of existing gas or oil heating². That figure does not match the £7,500 and £9,000 values in the official scheme rules and guidance, and the two figures stand unreconciled. The official figures are the ones the scheme is administered on.

What the grant covers and what it does not

The grant is a contribution to the cost and installation of the heat pump. It is not a schedule of works, and it does not itemise groundworks, drilling, radiators, cylinder or electrical upgrades. Ofgem describes the scheme as providing upfront capital grants to support the installation of heat pumps and biomass boilers in homes and non-domestic buildings¹¹.

What the scheme does specify is the technology and its performance. Eligible technologies are air-to-water heat pumps, air-to-air heat pumps, ground source heat pumps including water source heat pumps and shared ground loops, and biomass boilers⁶. Ground source heat pumps must achieve an in situ seasonal coefficient of performance of at least 2.8⁶. All heating systems installed under the scheme must meet the relevant MCS standards approved and published by the Secretary of State⁶.

Capacity limits apply. An individual heat pump system is capped at 45 kWth, a multi heat pump system at 70 kWth, and a shared ground loop system at 300 kWth total, with each connected heat pump not exceeding 45 kWth⁶. Those ceilings sit far above a typical house.

The grant also does not cover the loop field as a separate item, and it does not scale with the size of the groundworks. A property needing a deep borehole and a property needing a shallow trench attract the same £7,500, which is why the grant covers a larger share of a trench installation than of a drilled one.

Eligibility: who can claim the grant

The scheme supports the decarbonisation of homes and small and medium non-domestic buildings in England and Wales⁴. Only properties in England and Wales are eligible⁶. Scotland and Northern Ireland run separate arrangements, and the grant figures in this article do not apply there.

The property must be replacing a fossil fuel heating system such as gas, oil or LPG, or an electric heating system that is not already a heat pump⁸. The previous heating system being replaced must have been either a fossil fuel-based system or an electric heating system that does not include a heat pump⁶.

Several exclusions matter to households:

• Properties classed as social housing are not eligible for BUS funding, and that includes shared ownership properties⁸.
• Self-build properties are eligible for heat pumps only, not biomass⁶.
• A property is not eligible if a previous BUS grant has already been received for installing a heat pump or biomass boiler at the same address⁶.
• Only one voucher can be redeemed per property⁶.

The energy performance certificate requirement has changed. Croydon's guidance states that a property must have a valid energy performance certificate¹, but Ofgem's installer guidance states that from 28 April 2026 properties are no longer required to have a valid EPC to apply for BUS⁶.

The installer must be certified by the Microgeneration Certification Scheme, a nationally recognised certification body⁴. That requirement is what connects the grant to the installation standards covered below.

How the grant is paid: upfront discount, not a cheque

The grant is an upfront capital grant, and Ofgem describes the scheme as providing upfront capital grants towards the cost of installing approved heat pumps¹¹. In practice the installer applies the discount to the quoted price and recovers the grant from Ofgem. The householder does not receive a payment.

The application is a two-stage process. The installer submits the voucher application, Ofgem issues the voucher, the installer submits a voucher redemption application, and the installer then receives the grant payment¹². Ofgem is the scheme administrator, and applications for a grant voucher go to Ofgem⁴.

The redemption application must be properly made within 120 days of the commissioning date⁶. That deadline sits behind the voucher deadline, and both have to be met.

General enquiries go to the BUS Enquiries team at BUS.Enquiry@ofgem.gov.uk⁸. Day-to-day questions about a specific installation go to the installer, who holds the voucher.

Installation standards: MCS certification and commissioning

Every ground source installation claiming the grant has to be done by an MCS-certified installer, and the system has to meet MCS standards⁴. The Microgeneration Certification Scheme is the product and installation standard that the scheme rules point to, and it is the same standard that planning legislation in Northern Ireland defines for air source heat pumps¹⁴.

The performance requirement is the part that bites. A ground source heat pump must achieve an in situ seasonal coefficient of performance of at least 2.8⁶. That is a measured figure from the installed system, not a laboratory rating, and it depends on the ground loop being correctly sized, the emitters being correctly specified and the system being commissioned properly.

Commissioning is what starts the clock. The redemption application must be properly made within 120 days of the commissioning date⁶, and the installation itself must be completed within the voucher period⁸.

There is support for the certification side. The MCS Certification Fund pays 75%, up to a maximum of £1,000, of the certification fees for MCS certification on heat pumps¹⁵. That is aimed at installers building the capability to work to the standard, and it is a Scottish Government measure.

For a household, the practical consequence is that the installer's certification is not a formality. It is the condition that makes the grant payable and the standard that the commissioning evidence is measured against.

Shared ground loops: costs and rules for multiple homes

A shared ground loop is a single buried collector serving several properties, with an individual heat pump in each home. The BUS grant covers them: £7,500 towards a ground source heat pump including water source heat pumps and those on shared ground loops⁴.

The capacity rules are set out separately for these systems. A shared ground loop system is capped at 300 kWth total, with each connected heat pump not exceeding 45 kWth⁶. That structure allows a terrace or a block to share one loop field while each household runs its own heat pump and its own heating controls.

Take-up has been very small. Ofgem's quarterly reporting shows 11 shared ground loop ground source heat pumps among grants paid cumulatively since launch, as at 30 November 2023¹⁶, rising to 17 by 29 February 2024¹⁷, and 29, or 0.05% of grants paid to date, by 29 August 2025¹³. In the quarter from May to July 2025, two shared ground loop grants were paid¹³.

The RHI also shows how ground source performance has been treated historically. Ground source heat pumps with high temperature flows became eligible for the RHI as long as they had a seasonal performance factor of 2.5 or more, and the scheme's example annual payment for a ground source heat pump was £1,356.10 a year, based on a deemed heat demand of 10,000 kWh, an SPF of 3.4 and a tariff of 19.10p¹⁹. That scheme is closed to new applicants, and the figures are historical.

Running costs and efficiency: why ground source costs more to install but less to run

Ground source heat pumps are generally more efficient than air source, dependent on ground conditions, but have higher set-up costs²⁰. That is the trade in one sentence. The ground stays at a more stable temperature than the air, so the pump works across a narrower temperature lift, and the efficiency advantage is largest when the air is coldest.

The installation cost difference has a physical cause. An air source heat pump is easier and cheaper to install than a ground source heat pump because it does not use buried pipes²¹. Ground source heat pumps are typically more expensive and require more space²².

What that buys is a system that heats the home and domestic hot water from a buried loop²³. The dependence it leaves is on electricity. Fuel costs for a ground source or water source heat pump system will vary with the price of grid electricity, unless the electricity is generated on site¹⁴. A ground loop removes the fuel delivery, not the meter.

The running cost figures published in the market do not agree, and the disagreement is wide enough that no single number should be treated as a budget. One set puts annual running costs at £1,050 and £1,650; another puts them at £540 to £900. Yearly savings are given as between £520 and £2,500 depending on the type of fuel, and separately as £145 to £380.

The one comparison that is stable across sources is the direction of travel. A ground source heat pump will save much more money if it is replacing an electric or coal-based system, and may not be suitable if the home is on mains gas². That is a statement about the fuel being displaced, not about the heat pump.

0% VAT on heat pump installations

Heat pump installations benefit from being exempt from VAT⁷. HMRC's guidance lists ground source heat pumps among the technologies qualifying for a lower rate of VAT, alongside air source heat pumps²⁴.

The effect is that the quoted installation price does not carry the standard rate. For a project at the £28,000 to £57,000 end of the published range, that is a material difference to the total, and it applies to the installation rather than to the equipment alone.

The VAT position is separate from the grant. A grant-funded installation and a privately funded installation both attract the treatment, and the two do not interact.

Why the phase-out of gas boilers shapes the decision

The direction of policy is the reason a ground source quote is worth reading even where the running cost case is thin. The government has set out an intention to phase out the installation of new and replacement natural gas boilers from 2035, running in line with replacement cycle timelines so that almost all heating systems in 2050 are low carbon²⁵. No legally binding regulatory decision has been made on that timeline.

The scheme itself runs to 30 December 2029, and as of 28 April 2026 it has been extended to 2030⁴. The £2.7bn in funding to 2030 covers £7,500 towards the cost and installation of ground and air source heat pumps, including water source heat pumps²⁶.

For a household, the phase-out matters in two ways. First, it sets the horizon over which a ground source installation is expected to be the last heating system fitted. Second, it makes the ground loop the durable part of the investment: the buried collector has no moving parts and no flue, and it is the part of the system that a future heat pump would reuse.

The dependence that remains is on the electricity grid and on a supplier. A ground loop is a source of heat, not a source of power, and the running cost of the system tracks the price of electricity unless that electricity is generated on site¹⁴. That is the honest limit of what a ground source heat pump does for a household's energy independence: it removes the fuel delivery and the flue, and it leaves the meter.