How the upfront cost of installing a heat pump compares to an electric boiler
The installed cost of an air-source heat pump in 2026 ranges from £7,000 to £13,000, depending on property size and system complexity (Energy Saving Trust, 2026). A new electric boiler installation typically costs £1,500 to £3,000, including the unit and basic labour (Energy Saving Trust, 2026).
The Boiler Upgrade Scheme (BUS) offers a £7,500 grant toward the heat pump cost, reducing the net upfront to roughly £0–£5,500 for eligible households (GOV.UK, 2026). Electric boilers are not eligible for the BUS grant, so the full cost is paid by the homeowner. This means the upfront gap narrows significantly for those who qualify.
For a typical three-bedroom semi-detached home, the heat pump installation may still require additional work such as new radiators or a hot water cylinder, adding £1,000–£2,500 to the total (Energy Saving Trust, 2026). Electric boilers usually connect to existing pipework with minimal modification.
The annual running cost difference between a heat pump and an electric boiler
A heat pump with a Seasonal Coefficient of Performance (SCOP) of 3.0 produces 3 kWh of heat for every 1 kWh of electricity used (Energy Saving Trust, 2026). An electric boiler has 100% efficiency, 1 kWh of electricity produces 1 kWh of heat (Energy Saving Trust, 2026).
For a typical three-bedroom semi-detached home using 12,000 kWh of heat per year, the heat pump costs roughly £840–£960 annually, while the electric boiler costs £1,360–£1,560 annually (based on Ofgem price cap of 28p/kWh for electricity, Q1 2026; Ofgem, 2026). The annual saving of £395–£525 offsets the higher upfront cost over time.
If electricity prices rise further, the heat pump’s advantage grows because it uses less electricity per unit of heat. However, if the heat pump’s SCOP drops below 2.5 due to poor installation or a cold climate, the savings shrink considerably.
Who qualifies for the £7,500 Boiler Upgrade Scheme grant for heat pumps
The grant is available to homeowners in England and Wales who replace an existing fossil-fuel heating system (gas, oil, LPG, or electric) with an eligible heat pump (GOV.UK, 2026). The property must have a valid Energy Performance Certificate (EPC) with no outstanding recommendations for loft or cavity wall insulation (DESNZ, 2026).
Landlords, new-build properties, and social housing are not eligible for the BUS grant (GOV.UK, 2026). The grant is applied as a discount at the point of installation by the installer, not as a post-installation rebate. This means you pay the reduced price upfront.
If your EPC shows insulation recommendations, you must complete those improvements before or as part of the heat pump installation to qualify. This can add cost and time, but also improves the heat pump’s performance.
Quick numbers, heat pump vs electric boiler at a glance
| Metric | Heat pump (air-source) | Electric boiler |
|---|---|---|
| Upfront cost (installed, without grant) | £7,000–£13,000 | £1,500–£3,000 |
| Upfront cost (installed, with BUS grant) | £0–£5,500 | Not eligible |
| Annual running cost (12,000 kWh home) | £840–£960 | £1,360–£1,560 |
| Efficiency | SCOP 3.0 (300%) | 100% |
| Lifespan | 15–20 years | 10–15 years |
| Carbon emissions per year (kg CO₂) | ~1,000–1,200 | ~3,000–3,400 |
All figures sourced from Energy Saving Trust, 2026, Ofgem, 2026, and DESNZ, 2026. Carbon emissions assume grid electricity at 0.25 kg CO₂/kWh.
The direct answer to “should I choose a heat pump or an electric boiler in 2026”
If you can afford the upfront cost and qualify for the BUS grant, a heat pump is cheaper to run and produces lower carbon emissions than an electric boiler (Energy Saving Trust, 2026). If you cannot afford the upfront cost, do not qualify for the grant, or have a small home with low heating demand, an electric boiler is the cheaper and simpler option (Energy Saving Trust, 2026).
For homes without a gas connection, both are viable, but the heat pump offers long-term savings if the property is well-insulated. The payback period for a heat pump versus an electric boiler is typically 6–12 years with the grant, compared to 12–20 years without it.
Consider your property’s insulation level, your budget, and whether you plan to stay in the home long enough to recoup the higher upfront cost through lower bills. Heat pump running costs vs electric boiler
How to verify a certified heat pump installer for grant eligibility
The installer must be registered with the Microgeneration Certification Scheme (MCS) to carry out the installation and for the homeowner to claim the BUS grant (MCS, 2026; GOV.UK, 2026). Check the installer’s MCS certificate number on the MCS website before signing a contract.
Electric boiler installations do not require MCS certification, but the installer should be registered with Competent Person Schemes such as NICEIC or NAPIT for electrical work (NICEIC, 2026; NAPIT, 2026). TrustMark registration is also recommended for both heat pump and electric boiler installers as a quality assurance mark (TrustMark, 2026).
Using an uncertified installer for a heat pump will disqualify you from the BUS grant and may void the manufacturer’s warranty. Always ask for proof of certification in writing.
The role of home insulation in making a heat pump cost-effective
A heat pump operates best in a well-insulated home because it runs at lower flow temperatures (35–45°C) than a boiler (Energy Saving Trust, 2026). Without adequate loft and cavity wall insulation, the heat pump may struggle to heat the home efficiently, increasing running costs and reducing the annual savings (DESNZ, 2026).
The BUS grant requires the property to have an EPC with no outstanding insulation recommendations, meaning you must insulate before or as part of the installation (GOV.UK, 2026). This can add £1,000–£3,000 to the project cost but also lowers your overall heating bills.
Electric boilers are less sensitive to insulation levels, but running costs will still be higher in a draughty home. For both systems, improving insulation is the most cost-effective first step before upgrading your heating. Best insulation grants UK 2026
Frequently Asked Questions
Yes, a heat pump is cheaper to run. For a typical 3-bed semi using 12,000 kWh/year, the heat pump costs £840–£960 annually, while the electric boiler costs £1,360–£1,560 (Ofgem price cap, Q1 2026). That's an annual saving of £395–£525.
An air-source heat pump installation costs £7,000–£13,000, while an electric boiler costs £1,500–£3,000 (Energy Saving Trust, 2026). The Boiler Upgrade Scheme offers a £7,500 grant for heat pumps, reducing the net cost to £0–£5,500 for eligible households (GOV.UK, 2026).
No, the Boiler Upgrade Scheme does not cover electric boilers. It provides a £7,500 grant only for heat pumps (air-source or ground-source) and biomass boilers (GOV.UK, 2026). Electric boiler owners pay the full installation cost.
A heat pump typically lasts 15–20 years, while an electric boiler lasts 10–15 years (Energy Saving Trust, 2026). Heat pumps require less frequent replacement, though both need annual servicing to maintain efficiency.
Yes, a heat pump can replace an electric boiler, but it may need new radiators or a hot water cylinder, costing £1,000–£2,500 extra (Energy Saving Trust, 2026). Electric boilers connect to existing pipework with minimal changes.
