Most homeowners considering a heating upgrade in 2026 fall into one of two camps: “my boiler’s getting old, what should I replace it with?” or “I’d like to reduce my carbon footprint, what are my options?” Both questions land at the same place — heat pump or new boiler — and the right answer depends on your specific property, not what’s fashionable.
We install both. This is the honest comparison, including the cases where a heat pump is genuinely the wrong choice.
Quick comparison
| New gas boiler | Air source heat pump | |
|---|---|---|
| Capital cost (3-bed semi) | £2,200-£3,800 | £11,500-£14,000 |
| Grant available | None | £7,500 BUS grant |
| Net cost (3-bed semi) | £2,200-£3,800 | £4,000-£6,500 |
| Install time | 1 day | 1-3 days |
| Annual running cost (typical) | £1,400-£1,700 | £1,300-£1,650 |
| vs oil boiler running cost | £2,400-£3,200 | £1,300-£1,650 (saves £1,000-£1,500/yr) |
| vs LPG running cost | £2,800-£3,600 | £1,300-£1,650 (saves £1,200-£2,000/yr) |
| Lifetime (typical) | 12-15 years | 15-20 years |
| Warranty | Up to 12 years | 7 years |
| Carbon emissions | ~2.2 tCO2e/yr (typical 3-bed) | ~0.6 tCO2e/yr (grid mix 2026) |
| Pairs with solar | No direct integration | Yes — large running cost reduction |
| Suitable for off-gas-grid | No (oil/LPG only) | Yes — strongest case |
When a boiler is the right answer
Despite all the heat pump talk, a modern A-rated gas boiler remains the right choice for many UK homes in 2026. The cases:
1. Your existing boiler has just failed. Heat pump installs typically take 4-10 weeks from quote to commissioning. If you’re staring at a non-functional boiler in February, a same-week boiler swap is the practical answer. You can plan a heat pump for a future replacement when the boiler is working but ageing.
2. You’re selling within 3-4 years. Heat pump capital cost is recouped over 7-15 years of running cost savings. If you’re moving sooner, those savings don’t accrue to you. The boiler is the smarter financial choice in this case, even if the heat pump is the better long-term decision for the property.
3. Budget constraint is the dominant factor. £2,200 vs £4,000+ for the net costs (post-grant) is a real gap, even if the heat pump is the better total-cost-of-ownership decision.
4. Severe insulation issues that can’t be addressed. Heat pumps work in EPC D and E homes, but they work better in EPC C or higher. If your home has solid walls that can’t easily be insulated and a budget that won’t stretch to extensive fabric work, the heat pump efficiency will disappoint and the running costs will reflect that.
5. Listed building with emitter constraints. Heat pumps deliver heat at lower flow temperatures than boilers, meaning radiators often need upsizing. In a listed Grade I or II* property where radiator changes aren’t consented, the heat pump won’t deliver its rated COP and the case weakens.
6. Your home was already going to need significant emitter changes anyway. If you’re doing a rewire and replumb regardless, the incremental cost of preparing for a future heat pump is small. Get the boiler now and plan the heat pump for when the boiler dies — the radiators and pipework will already be sized for low-flow operation.
When a heat pump is the right answer
1. You’re currently on oil, LPG or solid fuel. This is the strongest case. Running cost savings are £1,000-£2,000 per year typically, and the £7,500 BUS grant brings the net install cost close to a like-for-like boiler replacement. Payback against the cost gap is often 3-5 years, with 15+ years of additional savings beyond that. We see strong cases across the Tyne Valley, Weardale, rural Northumberland and the off-gas County Durham villages.
2. You’re already considering solar. Heat pump + solar PV is a genuinely compounding combination. Solar drops the heat pump’s electricity cost by 25-35% over the year, and the heat pump’s existence (~3,000-5,000 kWh/year extra electricity demand) makes a larger solar array economically viable. The combined install costs less than two sequential projects.
3. You’re planning to stay 7+ years. Heat pump payback timeline mostly works out within this window. Beyond it, you’re collecting genuine running cost savings every year.
4. Your home is reasonably well insulated. EPC C or B is ideal; EPC D works fine in most cases. Heat pumps reward insulation more than boilers do — every percentage point of fabric improvement compounds with the COP advantage.
5. You want to reduce carbon emissions. A heat pump in 2026 delivers roughly 70% lower direct carbon emissions than a gas boiler, falling further as the UK grid continues decarbonising. For homeowners with personal or ESG-linked carbon commitments, this is meaningful.
6. You’re buying a property that needs a heating system replaced. If you’ve just bought a house with an end-of-life boiler, the additional capital while you’re already doing renovation work is much easier to justify than a separate replacement project later.
What about hybrids?
A “hybrid” heat pump setup keeps the gas boiler as a backup or peak-demand topup, with the heat pump as the primary heat source. They sound appealing — best of both worlds — but they have practical issues:
- BUS grant excluded. The £7,500 grant requires the heat pump to fully replace the existing system. Hybrid setups don’t qualify.
- Capital cost is the worst of both. You’re paying for both systems’ equipment.
- Controls complexity. Switching between heat sources needs intelligent controls; not all setups handle it well.
- Long-term direction. If gas is going to be phased out as part of UK decarbonisation, the hybrid case weakens annually.
We don’t typically recommend hybrid setups for new installs. The only common case where they make sense is where an existing oil/LPG boiler is recent and working, and the customer wants to electrify gradually — but even then, full heat pump replacement plus selling the boiler typically wins.
The 10-year cost-of-ownership picture
For a typical 3-bed semi currently on mains gas:
| New gas boiler | Heat pump (after BUS) | |
|---|---|---|
| Year 0 capital | £3,000 | £5,500 |
| Year 1-10 running cost | £15,000 | £14,500 |
| Year 10 servicing | £1,500 | £1,000 |
| Year 5 likely repair | £400 | £200 |
| Total 10-year cost | £19,900 | £21,200 |
For mains gas swap, the 10-year cost is roughly comparable. The heat pump wins on year 11-20 (no capital cost as the gas boiler hits end-of-life around year 12) and carbon emissions throughout. But on a 10-year financial frame, the case is closer than heat pump advocates often claim.
For oil/LPG swap, the same picture:
| New oil boiler | Heat pump (after BUS) | |
|---|---|---|
| Year 0 capital | £4,500 | £5,500 |
| Year 1-10 running cost (oil) | £28,000 | £14,500 |
| Year 10 oil tank servicing/replacement | £500 | £0 |
| Total 10-year cost | £33,000 | £20,000 |
For off-gas-grid, the heat pump wins decisively — £13,000 less over 10 years, before counting the much larger reduction over years 11-20.
What to do next
The honest first step is to get a proper survey. Both options need site-specific information — heat loss calculation for a heat pump, gas supply assessment and emitter audit for a boiler.
We do free surveys for either option, and we’ll genuinely tell you which is right for your home. If your case clearly favours a boiler, we’ll quote a boiler — we install plenty of them. If it favours a heat pump, the £7,500 grant comes off the quote before you see the figure.
Book a free survey → or call 0191 535 2711.
Related: Heat pump cost UK 2026 · Boiler Upgrade Scheme 2026 complete guide · Heat pumps service page · Boilers service page