Heat Pump vs Gas Boiler: Which Is Better for Your Home? (2026)
Millions of UK homes face the same question: when the boiler breaks, do you replace it with another gas boiler — or make the switch to a heat pump? This guide compares the two technologies across every dimension that matters: upfront cost, running costs, grants, carbon footprint, lifespan and home suitability.
At a glance
| Heat pump | Gas boiler | |
|---|---|---|
| Upfront cost (installed) | £8,000–£15,000 (before BUS grant) | £1,500–£4,000 |
| After best available grant | £500–£7,500 (with £7,500 BUS grant) | No relevant grant |
| Annual running costs (typical home) | ~£600–£900/yr (optimised tariff) | ~£700–£1,200/yr (current gas prices) |
| Carbon emissions | Low–zero (grid electricity, improving yearly) | High (direct methane combustion) |
| Expected lifespan | 20–25 years | 10–15 years |
| Installation disruption | 1–3 days; may need larger radiators | Half a day; drop-in replacement |
| Works well in poorly insulated homes | Not ideal — needs good insulation | Yes |
| Future-proof (gas boiler ban 2035) | Yes — electric heating exempt from ban | No — new gas boilers banned from 2035 |
Verdict:For most homes that can accommodate one, a heat pump — especially with the £7,500 BUS grant — is the better long-term choice: lower carbon, longer lifespan, and future-proof against the 2035 gas boiler phase-out. A gas boiler remains the lower-disruption, lower-upfront-cost option for poorly insulated or cash-constrained households in the near term.
The £7,500 Boiler Upgrade Scheme changes the calculation
The UK government's Boiler Upgrade Scheme (BUS) gives up to £7,500 off the installed cost of an air-source heat pump for homes in England and Wales. The grant is claimed by your MCS-certified installer and deducted from your quote. For many homes, this brings the net cost of a heat pump close to that of a mid-range gas boiler — while delivering a system that will last twice as long and qualifies for lower-carbon electricity tariffs.
Running costs: the honest picture
Gas currently costs around 6–7p/kWh in the UK; electricity costs around 25–30p/kWh. A gas boiler running at 90% efficiency delivers heat at roughly 7–8p/kWh effective cost. A heat pump producing 3.5 units of heat per unit of electricity (SCOP 3.5) delivers heat at roughly 7–9p/kWh at standard electricity rates — very similar.
On a heat-pump-optimised electricity tariff (e.g. Octopus Cosy, Intelligent Octopus), overnight electricity can fall to 7–12p/kWh, making a well-installed heat pump cheaper to run than gas. The economics continue to improve as the grid decarbonises and electricity-to-gas price ratios normalise.
Is my home suitable for a heat pump?
Heat pumps work best in homes with an EPC rating of C or above, good loft and wall insulation, and adequate radiator or underfloor heating sizing. An MCS-certified installer will calculate your home's heat loss before specifying a system — most homes built after the 1970s are suitable, and many pre-war homes can be upgraded first (the ECO4 and GBIS grants can fund the insulation work).
Poorly insulated solid-wall homes in poor condition may still be better served by a new efficient gas boiler in the short term — but it's worth getting a heat pump survey to understand the full picture before committing either way.
The 2035 gas boiler ban — what does it mean?
The UK government has confirmed that new gas boilers will not be permitted in new-build homes from 2025, and has targeted phasing out new gas boiler installations in existing homes by 2035(the exact policy mechanism is still being finalised). Heat pumps are not affected by this ban. Installing a gas boiler now in a home that's not near the end of its boiler's life means you may face another transition before 2035 anyway. For homes that can accommodate a heat pump today, the BUS grant makes the transition more affordable than it has ever been.
Common questions
Should I replace my gas boiler with a heat pump now?
If your boiler needs replacing anyway and your home is reasonably well-insulated (EPC C or better), the £7,500 BUS grant makes now an excellent time. If your boiler has years of life left and your home needs significant insulation work first, it may be worth planning the transition over the next 1–3 years — combining insulation and heat pump grants.
Can a heat pump heat my home as well as a gas boiler?
Yes, when correctly sized and installed. Heat pumps are designed to run at lower temperatures (40–50°C vs 60–80°C for a boiler) for longer periods — this is actually more efficient, and means well-designed systems keep homes at a comfortable, even temperature. Correctly sized radiators or underfloor heating are important for best results.
Do heat pumps work in cold weather?
Modern air-source heat pumps continue to operate efficiently down to -15°C to -20°C outside air temperature — well below typical UK winter lows. Most UK winters rarely fall below -5°C. SCOP ratings are based on realistic seasonal conditions, not just warm days.
Will a heat pump increase my property value?
Recent research suggests heat pumps modestly increase property values in the UK — particularly as EPC ratings become more visible to buyers and mortgage lenders. A heat pump typically lifts an EPC by one band, and improved EPC ratings are increasingly linked to buyer premiums of 2–5% in some markets.
Is there a grant for a gas boiler replacement?
There is no grant specifically for replacing a gas boiler with a new gas boiler for most households. The ECO4 scheme can fund a first-time gas central heating installation for off-gas-grid homes, and in some cases a heating controls upgrade. The BUS grant (£7,500) applies only to heat pump and biomass boiler replacements.
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