Full air source heat pump systems
These are guide prices for a complete air-to-water heat pump system, installed and including VAT: the outdoor unit, a hot water cylinder, weather-compensating controls, minor pipework and commissioning. The after-grant column applies in England and Wales, where the Boiler Upgrade Scheme deducts £7,500 (£9,000 when replacing oil or LPG, for installations from 21 July 2026 to 31 March 2027).
| Home | Typical size | Installed guide price | After £7,500 grant (England and Wales) |
|---|---|---|---|
| 1–2 bedroom flat or small terrace | 4–5 kW | £9,500–£12,500 | £2,000–£5,000 |
| 2–3 bedroom terrace or semi | 5–7 kW | £10,500–£13,500 | £3,000–£6,000 |
| 3 bedroom semi or small detached | 6–9 kW | £12,000–£15,500 | £4,500–£8,000 |
| 4 bedroom detached | 8–12 kW | £14,000–£18,000 | £6,500–£10,500 |
| 5+ bedroom or larger older house | 11–16 kW | £16,500–£22,500 | £9,000–£15,000 |
Prices vary by region; the guide price tool applies a regional adjustment from your postcode.
Radiators, pipework and underfloor heating
Heat pumps run most efficiently with cooler water, so some homes need larger radiators. The survey gives a room-by-room list; many homes keep most of their existing radiators.
| Work | Guide price |
|---|---|
| Replacement radiator, sized for a heat pump (each, fitted) | £250–£450 |
| Upgrade of about 10 radiators | £2,000–£5,000 |
| Pipework upgrade (e.g. microbore to larger bore) | £1,500–£3,500 |
| Wet underfloor heating, one room | £1,500–£3,500 |
| Wet underfloor heating, whole ground floor | £5,000–£15,000 |
Installed, inc VAT.
Other heat pump types
Air-to-air systems heat rooms directly and do not provide hot water. Hybrid systems keep an existing boiler alongside a smaller heat pump and are not eligible for the Boiler Upgrade Scheme.
| System | Guide price |
|---|---|
| Air-to-air heat pump, 1–2 rooms | £2,400–£5,000 |
| Air-to-air heat pump, multi-room 3–4 bedroom home | £4,000–£8,000 |
| Hybrid heat pump alongside an existing boiler | £7,000–£11,000 |
| High-temperature unit (extra over a standard unit) | £1,500–£3,000 |
| Replacing an old outdoor unit like-for-like | £6,000–£9,500 |
Installed, inc VAT. In England and Wales the Boiler Upgrade Scheme gives £2,500 towards air-to-air systems.
Servicing, surveys and repairs
Annual servicing keeps a heat pump efficient and is often a warranty condition. Repairs start with a fault-finding visit at a rate agreed before we attend.
| Work | Guide price |
|---|---|
| Annual heat pump service | £120–£250 |
| Fault-finding visit (first hour) | £90–£180 |
| Stand-alone heat loss survey and report | £150–£400 |
| Sensor or thermistor replacement | £120–£280 |
| Expansion vessel or pressure relief valve | £150–£350 |
| Circulating pump replacement | £250–£480 |
| Fan motor replacement | £300–£650 |
| Refrigerant leak repair and re-gas (split systems) | £350–£950 |
| Main control board (PCB) replacement | £450–£1,100 |
Inc VAT.
Grants and VAT by nation
| Nation | Main support for heat pumps | Key points |
|---|---|---|
| England | Boiler Upgrade Scheme: £7,500 (£9,000 replacing oil or LPG, 21 July 2026 to 31 March 2027; £2,500 air-to-air) | MCS-certified installer applies; deducted from your quote |
| Wales | Boiler Upgrade Scheme: £7,500 (£9,000 replacing oil or LPG, 21 July 2026 to 31 March 2027) | Same scheme and rules as England |
| Scotland | Home Energy Scotland grant up to £7,500, plus up to £1,500 rural uplift; interest-free loan up to £7,500 | You apply; written offer needed before work starts |
| Northern Ireland | No dedicated heat pump grant for homeowners at present | Some heat pumps funded through NISEP in the past |
Heat pump installation is zero-rated for VAT across the UK, including Northern Ireland, until 31 March 2027. Scheme figures as at October 2026; check gov.uk, Ofgem or Home Energy Scotland before relying on them.
Price questions
How much does an air source heat pump cost to install?
A full air source heat pump system typically costs £9,500–£12,500 for a one- or two-bedroom flat or small terrace, £12,000–£15,500 for a three-bedroom semi and £16,500–£22,500 for a larger or older home with five or more bedrooms. These are guide prices, installed and including VAT. Grants can reduce the cost, depending on which UK nation you live in. Your final price is fixed in a written quote after the free home survey. See all guide prices.
What is included in the guide price for a heat pump system?
Our full-system guide price covers the outdoor heat pump unit, a hot water cylinder, controls, commissioning and typical minor pipework. Extras are priced separately only when your home needs them: a replacement radiator sized for a heat pump is a guide price of £250–£450 each, and a pipework upgrade is typically £1,500–£3,500. All are guide prices, installed and including VAT. Your written quote lists exactly what is included before you decide.
What heat pump grants can I get, and does it depend on where I live?
The grant you can get depends on which UK nation you live in. In England and Wales, the Boiler Upgrade Scheme gives £7,500 towards an air-to-water heat pump, or £9,000 when it replaces oil or LPG heating for installations from 21 July 2026 to 31 March 2027. In Scotland, Home Energy Scotland offers a grant of up to £7,500, more for eligible rural and island homes, plus an optional interest-free loan. Northern Ireland has no dedicated heat pump grant for homeowners at present. See heat pump grants.
How does the Boiler Upgrade Scheme work?
The Boiler Upgrade Scheme is a government grant in England and Wales that takes £7,500 off the cost of an air source heat pump. The MCS-certified installer applies to Ofgem for you and deducts the grant from your quote, and Ofgem then contacts the property owner to confirm. Your quote names the MCS-certified installer for your job. Since 28 April 2026 a valid Energy Performance Certificate (EPC) is no longer required. For a typical three-bedroom home the guide price after the grant is £4,500–£8,000, installed and including VAT.
Who is eligible for the Boiler Upgrade Scheme?
You are usually eligible for the Boiler Upgrade Scheme if you own an existing home in England or Wales, including as a landlord, and are replacing fossil-fuel or electric heating. The new system must meet the home's full heating and hot water needs. Most new builds, social housing, homes already funded for a heat pump and hybrid systems are not eligible. Air-to-air heat pumps in homes can get a separate £2,500 grant from 28 April 2026. We check eligibility at survey.
What heat pump funding is there in Scotland?
In Scotland, Home Energy Scotland offers a grant of up to £7,500 towards a heat pump, plus up to £1,500 more for eligible rural and island homes, and an optional interest-free loan of up to £7,500. You must receive a written funding offer before any work starts, and both the installer and the products must be MCS certified. Funding is first come, first served. The Boiler Upgrade Scheme is for England and Wales only.