A heat pump for your swimming pool costs between £3,500 and £7,500 installed, but running costs are roughly 60% lower than a gas or electric heater
If you own a swimming pool in the UK, you will know that heating it with gas, LPG or direct electric resistance can be expensive. A pool heat pump offers a much cheaper way to keep the water warm, using the same technology as an air-source heat pump for your home.
The direct answer is that a professionally installed air-source pool heat pump costs between £3,500 and £7,500 in 2026, and the running costs are roughly 60% lower than a gas or electric heater (Energy Saving Trust, 2026). A pool heat pump uses 1 kW of electricity to move 3–5 kW of heat from the outside air into your pool water, which is why the energy bills are so much lower.
The exact saving depends on three variables: your pool size, how often you use it, and your local electricity tariff. DESNZ domestic heating cost comparison tables show that a heat pump typically delivers a 60–75% reduction in energy bills compared with direct electric or LPG/propane heaters (DESNZ, 2026).
Quick numbers pool heat pump performance and cost benchmarks
| Metric | Typical Value | Source |
|---|---|---|
| Installed cost (air-source pool heat pump) | £3,500 – £7,500 | EST / MCS installer surveys |
| COP (coefficient of performance) range | 3.0 – 5.5 | EST / MCS product database |
| Running cost per season (6-month outdoor pool, 12m x 6m) | £400 – £800 | EST / Ofgem typical domestic consumption |
| Heat output range (kW) | 5 – 20 kW | MCS certified product list |
| Noise level (at 1m) | 40 – 55 dB(A) | MCS / manufacturer data sheets |
| Typical lifespan | 10 – 15 years | EST / industry trade bodies |
| Eligibility for BUS grant | No | GOV.UK Boiler Upgrade Scheme |
The direct answer a heat pump for a swimming pool in the UK is an air-source heat pump that heats pool water efficiently, but it is not eligible for the Boiler Upgrade Scheme
A pool heat pump is a dedicated air-to-water heat pump that circulates pool water through a heat exchanger, rather than heating it directly. It works exactly like the heat pump in your home, but it is built to handle the higher flow rates and chemical conditions of pool water.
The UK Boiler Upgrade Scheme (BUS) does NOT cover pool heating. The BUS only applies to primary space heating and hot water for a home, not to swimming pools, hot tubs or any other secondary heating loads (GOV.UK Boiler Upgrade Scheme guidance, 2026). No other national grant scheme such as ECO4 or the Great British Insulation Scheme covers pool heat pumps either.
DESNZ eligibility rules for BUS confirm that the grant is strictly for replacing fossil fuel heating systems in the main dwelling, and pool heating is explicitly excluded (DESNZ, 2026).
Who is eligible for any financial support for a pool heat pump in 2026?
There is no direct national grant for pool heat pumps, but some local authorities or energy company schemes may offer partial funding. You should check with your local council or energy supplier for any regional offers, though these are rare and usually small.
The main financial support available in 2026 is the VAT reduction. All heat pumps, including pool models, installed by an MCS-certified installer are eligible for 0% VAT on the supply and installation until 2027 (HMRC VAT notice 708/6, 2026). This saves you 20% on the total installed cost.
To qualify for the 0% VAT rate, the homeowner must own the property and the pool. Landlords and tenants may have different rules, so check with your installer or HMRC if you are not the owner-occupier (GOV.UK VAT relief for energy-saving materials, 2026).
How to verify your installer is certified for a pool heat pump installation
Your installer must be MCS-certified for heat pumps to qualify for the 0% VAT reduction and any local funding. MCS certification covers air-source heat pumps for pool heating, but the installer must hold the specific product endorsement for the model they are fitting (MCS website, 2026).
TrustMark registration is also required for any government-backed scheme, though none currently apply to pool heat pumps. Even so, a TrustMark-registered installer is a good sign of quality workmanship (TrustMark, 2026).
You can check the MCS Installer Database at mcscertified.com for a certified installer in your area. Enter your postcode and filter by “heat pumps” to find installers who are qualified for pool heat pump work. DESNZ quality assurance requirements also recommend using MCS-certified installers for any heat pump installation (DESNZ, 2026).
What size heat pump does your pool need
Heat pump sizing is based on pool volume, the desired temperature rise, and heat loss from the pool surface caused by wind and ambient temperature. A rough rule of thumb is 1 kW of heat pump output per 10–15 m³ of pool water for a typical outdoor UK pool used from April to September (MCS heat pump sizing guidance, 2026).
For a standard 12m x 6m outdoor pool with an average depth of 1.5m, the volume is roughly 108 m³. That means you need a heat pump output of around 7–11 kW. Most UK homes have a single-phase electricity supply, which can handle heat pumps up to about 15 kW. Larger pools or indoor pools that need heating all year may require a 3-phase electricity supply. Check with a qualified electrician before ordering (CIBSE design standards for pool heating, 2026).
What running costs can you expect for a pool heat pump in the UK climate?
A seasonal running cost estimate for a standard 12m x 6m outdoor pool heated to 28°C from April to September is £400–£800 per year (EST heat pump running cost calculator, 2026). The heat pump’s COP drops in colder months when the outside air temperature falls below 5°C, so running costs increase significantly if you use it in winter.
Compare that with gas pool heaters, which cost roughly £1,000–£1,500 per season, and electric resistance heaters, which cost around £1,500–£2,500 per season (Ofgem typical domestic consumption values, 2026). The savings from a pool heat pump are clear, especially if you run the pool for the full six-month season.
What to check before buying a heat pump for your swimming pool
Before you buy, check these key specifications. The COP at 15°C and 7°C ambient temperature tells you how efficient the unit is in typical UK conditions. The noise level must comply with MCS 020 or local planning noise limits, which is usually 40–55 dB(A) at 1 metre (MCS 020 noise standard, 2026). The refrigerant type in 2026 is typically R32 or R290, both of which have lower global warming potential than older refrigerants. The warranty length is usually 2–5 years, but some manufacturers offer longer cover (MCS product database, 2026).
Check the MCS product database for the specific model to confirm it is certified. Get at least three quotes from MCS-certified installers and compare the total installed cost, not just the unit price. A cheaper unit may cost more to run if its COP is lower, so ask each installer for the expected seasonal running cost for your pool size.
How to compare heat pump quotes for your home
VAT relief on heat pumps explained
Frequently Asked Questions
A professionally installed air-source pool heat pump costs £3,500 to £7,500 in 2026, according to Energy Saving Trust and MCS installer surveys. The exact price depends on pool size and heat output.
Yes, pool heat pumps are worth it for most UK owners because running costs are 60% lower than gas or electric heaters, as reported by the Energy Saving Trust. They also have a lifespan of 10 to 15 years.
No, swimming pool heat pumps are not eligible for the Boiler Upgrade Scheme (BUS) in 2026, according to GOV.UK. The scheme only covers heat pumps for home heating.
Running a pool heat pump costs roughly £400 to £800 per season for a 12m x 6m outdoor pool, based on Ofgem typical consumption figures. Monthly costs range from £65 to £135 over a 6-month season.
Pool heat pumps range from 5 kW to 20 kW heat output, as listed on the MCS certified product database. Choose a size based on your pool volume and desired temperature rise.
