The short answer: Yes, heat pumps can completely replace gas boilers
A properly designed heat pump system provides 100% of your heating and hot water needs — no backup boiler required. Modern air source heat pumps work efficiently in UK winters, maintaining performance even when outdoor temperatures drop below freezing.
The key question isn't can you replace your gas boiler with a heat pump, but should you — and increasingly, the answer is yes.
Why replace your gas boiler with a heat pump in 2026?
1. The £7,500 grant makes it affordable
The UK government's Boiler Upgrade Scheme (BUS) gives you up to £7,500 off the installed cost of an air source heat pump. Your MCS-certified installer claims the grant and deducts it from your quote.
For many homes, this brings the net cost of a heat pump to £500-£7,500 — comparable to or cheaper than a new gas boiler, but with a system that lasts twice as long.
2. Gas boilers will be banned from 2035
The UK government has confirmed that new gas boilers will be banned in new-build homes from 2025, and sales of new gas boilers for existing homes will end by 2035. If you install a gas boiler today, you'll likely need to replace it again before 2035.
Installing a heat pump now future-proofs your home and avoids a rushed, expensive replacement later.
3. Heat pumps last longer
Heat pumps have an expected lifespan of 20-25 years, compared to 10-15 years for gas boilers. Even if the upfront cost is higher, the longer lifespan means lower lifetime cost.
4. Lower (or zero) carbon emissions
Heat pumps run on electricity, which is increasingly generated from renewables. The UK grid is now cleaner than gas combustion, and getting cleaner every year. If you have solar panels, you can power your heat pump with zero-carbon electricity.
5. Cheaper electricity tariffs are available
Many energy suppliers offer heat-pump-friendly tariffs with cheaper overnight rates (often 7-9p/kWh). If you combine a heat pump with a hot water tank, you can heat water overnight at low cost and use it throughout the day.
What does it cost to replace a gas boiler with a heat pump?
| Item | Cost |
|---|---|
| Heat pump + installation | £8,000–£15,000 |
| Boiler Upgrade Scheme grant | -£7,500 |
| Net cost to you | £500–£7,500 |
For comparison, a new gas boiler costs £1,500-£4,000 — but will need replacing again in 10-15 years, while a heat pump lasts 20-25 years.
Will a heat pump work in my home?
Heat pumps work best in homes that are:
- Well insulated (EPC rating C or above ideal, D acceptable with some upgrades)
- Have adequate outdoor space for the heat pump unit (similar size to a gas meter box)
- Have appropriately sized radiators or underfloor heating
Your installer will conduct a Heat Loss Survey (required for the BUS grant) to assess your home's suitability and design the right system. This survey costs £200-£400 but is often included in quotes.
Do I need to upgrade my radiators?
Not always. Many homes can keep existing radiators if they're adequately sized. Heat pumps work at lower flow temperatures (45-55°C vs 65-75°C for gas boilers), so larger radiators help maintain comfort.
The Heat Loss Survey will determine if radiator upgrades are needed. Upgrading 1-2 key radiators typically costs £300-£800, still making the total cost competitive with a gas boiler.
How long does installation take?
Installation takes 1-3 days, depending on whether radiator upgrades are needed. The full process from quote to completion is typically 4-8 weeks:
- Initial survey (1-2 hours): installer visits, provides quote
- Heat Loss Survey (2-3 hours): detailed assessment, system design
- Grant application (1-2 weeks): installer applies for BUS grant on your behalf
- Installation (1-3 days): heat pump installed, old boiler removed, system commissioned
What about running costs?
Running costs depend on your tariff, insulation, and how you use the heat pump:
- Standard tariff: similar to gas boiler (£700-£1,200/year)
- Heat pump tariff (e.g. Octopus Cosy): 30-40% lower (£500-£900/year)
- With solar panels: up to 50% lower if you generate daytime electricity
Use our Heat Pump Cost Calculator to estimate running costs for your home.
Can I keep my gas connection?
Yes, if you have a gas hob or other gas appliances. If you switch to electric cooking (induction hob), you can ask your gas supplier to disconnect the supply, saving the standing charge (£100-£120/year).
How do I get started?
The easiest way to replace your gas boiler with a heat pump is to get quotes from MCS-certified installers. They'll assess your home, design the system, apply for the grant, and handle installation.
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Compare quotes from vetted, MCS-certified heat pump installers in your area. They'll assess your home, design the system, and handle the £7,500 BUS grant application.
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