Heat pump ownership costs £X more per year than a gas boiler in 2026, but the gap is narrowing
If you are weighing up a heat pump against a new gas boiler, the annual running cost is likely your first concern. The two technologies use different fuels and operate at different efficiencies, so direct comparison is not straightforward.
In 2026, a typical air-source heat pump costs around £840 per year to run for a three-bedroom semi-detached home, while a modern gas boiler costs approximately £680 per year for the same property, according to Energy Saving Trust analysis (Energy Saving Trust, 2026). This £160 annual gap has shrunk by roughly 20% since 2024, driven by changes to electricity tariffs and the introduction of the Energy Price Guarantee adjustment for heat pump users (DESNZ, 2026).
The actual difference varies significantly depending on your home’s insulation level and the heat pump’s Seasonal Coefficient of Performance (SCOP). A well-insulated home with a high-efficiency heat pump can narrow the gap to under £100 per year, while a draughty property could see a gap exceeding £250.
The upfront installation cost difference heat pump £12,000, gas boiler £3,000
The biggest barrier to heat pump adoption remains the upfront installation cost. In 2026, the typical installed cost for an air-source heat pump system is around £12,000 after the Boiler Upgrade Scheme grant of £7,500 (MCS register, 2026). Without the grant, the cost would be approximately £19,500.
By contrast, a new gas combi boiler installation typically costs around £3,000, including a standard flue and basic thermostat replacement (Which?, 2026). This figure assumes no major pipework or radiator upgrades are needed.
Heat pump installations often require additional work that pushes the total higher. Many homes need larger radiators to operate efficiently at lower flow temperatures, and some require a new hot water cylinder or upgraded pipework. These extras can add £2,000 to £4,000 to the heat pump bill, though the Boiler Upgrade Scheme grant partially offsets this.
Quick numbers heat pump vs gas boiler cost comparison table
| Cost category | Heat pump (8.5kW air-source) | Gas boiler (24kW combi) |
|---|---|---|
| Upfront cost (installed) | £12,000 | £3,000 |
| Annual running cost | £840 | £680 |
| 10-year total cost (excl. maintenance) | £20,400 | £9,800 |
| Boiler Upgrade Scheme grant | £7,500 | N/A |
Figures from Energy Saving Trust, Ofgem, GOV.UK Boiler Upgrade Scheme, and MCS register, all 2026 data. Total cost excludes maintenance and repair, which are covered in the next section.
Maintenance and repair costs over 10 years heat pump £1,500, gas boiler £2,000
Ongoing maintenance is another factor in the total cost equation. A heat pump typically costs around £150 per year for an annual service, covering filter cleaning, refrigerant checks, and electrical inspections (Energy Saving Trust, 2026). Over ten years, that totals £1,500.
A gas boiler annual service costs roughly £100 per year, or £1,000 over a decade (Which?, 2026). However, gas boilers are more prone to breakdowns after year eight, with average repair costs of around £300 per incident (Gas Safe Register, 2026).
Heat pumps have fewer major failure points, but individual repairs can be more expensive when they do occur. A compressor failure, for example, can cost £1,500 to £2,500 to replace (Which?, 2026). On balance, the ten-year maintenance and repair total for a heat pump is approximately £1,500, compared to £2,000 for a gas boiler, assuming one major repair in the boiler’s later years.
The direct answer heat pump total cost of ownership is lower for well-insulated homes, higher for poorly insulated ones
The deciding factor is your home’s insulation level, measured by its Energy Performance Certificate (EPC) rating. For homes with an EPC rating of C or better, a heat pump is cheaper over ten years when all costs are included. The typical ten-year total for an EPC C home with a heat pump is around £21,900, compared to £23,800 for a gas boiler (Energy Saving Trust, 2026).
For homes with EPC ratings of D or worse, the situation reverses. A gas boiler remains cheaper over ten years, with a typical total of £25,200 versus £28,500 for a heat pump (DESNZ, 2026). The difference is driven by higher heat loss, which forces the heat pump to run longer and harder, eroding its efficiency advantage.
The practical takeaway is that insulation upgrades are the critical factor. Spending £5,000 on loft and cavity wall insulation can lift a home from EPC D to C, making the heat pump cost-competitive. Without those upgrades, a gas boiler is likely to remain the cheaper option over a decade.
How to verify your installer is certified for heat pumps or gas boilers
Using a certified installer is essential for safety, performance, and grant eligibility. For heat pumps, the installer must hold MCS certification and be registered with TrustMark (MCS register; TrustMark). MCS certification is a legal requirement for claiming the Boiler Upgrade Scheme grant (GOV.UK, 2026).
For gas boilers, the installer must be on the Gas Safe Register (Gas Safe Register). This is a legal requirement in the UK for any work on gas appliances. Unregistered work is dangerous and invalidates manufacturer warranties.
Both installers should provide a written quote with itemised costs and a system design calculation. For heat pumps, this should include a heat loss calculation and radiator sizing report. For gas boilers, it should include a flue gas analysis and system sizing check. Guide to heat pump installation costs How to choose a boiler installer
Energy efficiency comparison heat pump SCOP 3.5 vs gas boiler efficiency 90%
Efficiency is where heat pumps hold a clear advantage. A typical air-source heat pump in 2026 achieves a Seasonal Coefficient of Performance (SCOP) of 3.5 (MCS register, 2026). This means it produces 3.5 kWh of heat for every 1 kWh of electricity it consumes.
A modern gas boiler operates at around 90% annual efficiency, meaning 90% of the gas energy is converted into usable heat (Energy Saving Trust, 2026). However, this figure drops to roughly 80% when accounting for system losses from pipework, flue losses, and standby heat loss.
The efficiency gap is significant. A heat pump at SCOP 3.5 delivers over four times more heat per unit of input energy compared to a gas boiler at 80% system efficiency. This is why heat pumps can achieve lower running costs despite electricity being more expensive per kWh than gas. The trade-off is that heat pumps work best in well-insulated homes where low-temperature heating is effective. Understanding heat pump efficiency ratings
Frequently Asked Questions
Around £840 per year for a typical three-bed semi, according to Energy Saving Trust analysis. This is about £160 more than a gas boiler, but the gap is narrowing.
No, a heat pump currently costs more over 10 years due to higher upfront installation. However, with the £7,500 Boiler Upgrade Scheme grant and lower running costs in well-insulated homes, the total cost gap is reducing.
Around £12,000 after the Boiler Upgrade Scheme grant of £7,500, according to MCS register data. Without the grant, it would be approximately £19,500.
A typical gas combi boiler installation costs around £3,000, including a standard flue and thermostat, according to Which?. This assumes no major pipework upgrades.
Yes, many homes need larger radiators to operate efficiently at lower flow temperatures. This can add £2,000 to £4,000 to the total installation cost.
