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Home heating guide
Alternatives to gas boilers: every UK option compared (2026)
Replacing a gas boiler in 2026 means choosing between heat pumps, electric systems, hybrid setups and other low-carbon options. Here is how each alternative compares on installed cost, running costs, grants and the homes they suit best — so you can shortlist the right one before getting quotes.
Quick answer: for most UK homes the best gas boiler replacement is an air source heat pump, especially with the £7,500 Boiler Upgrade Scheme grant. If your radiators or budget can't support a full switch yet, a hybrid heat pump plus boiler system is a practical halfway step. Electric boilers, infrared panels and storage heaters cost less to install but usually more to run.
Why replace a gas boiler at all?
New homes are now built without gas boilers under the Future Homes Standard, and around a sixth of the UK's carbon emissions come from home heating. But there is no ban on keeping or replacing a gas boiler in an existing home — the choice to switch is yours. Common reasons homeowners give include rising gas prices, an ageing boiler facing expensive repairs, wanting to cut carbon, or accessing the grants that only apply to low-carbon systems.
If your boiler is under ten years old and working reliably, simply keeping it — possibly alongside a hybrid heat pump — can be the most sensible short-term option. Our heat pump vs gas boiler comparison covers the running-cost maths in detail.
All your options at a glance
| Option | Typical installed cost | Running costs | Grant? | Best for |
|---|---|---|---|---|
| Air source heat pump | £9,000–£15,000 pre-grant | Low with a good SCOP and tariff | £7,500 (BUS) | Most homes, especially with upgraded emitters |
| Hybrid heat pump + boiler | £6,000–£11,000 | Medium–low | Rarely eligible for BUS | Homes keeping a working boiler |
| Ground source heat pump | £18,000–£35,000+ | Lowest | £7,500 (BUS) | Homes with gardens for ground arrays |
| Electric boiler | £1,500–£4,000 | High on standard tariffs | No | Flats with existing pipework/radiators |
| Infrared panels | £150–£500 per panel | Medium–high | No | Single rooms, extensions, occasional use |
| Modern storage heaters | £400–£700 per unit | Low with off-peak tariff | Sometimes via ECO4 | Flats and smaller off-gas homes |
| Biomass boiler | £12,000–£20,000 | Medium (pellet prices) | £5,000 (BUS, off-gas areas) | Rural homes with fuel storage |
| District heating | Connection fee varies | Scheme-dependent | No | Homes on an existing heat network |
Costs are typical UK ranges and vary by property size, system design and installer. Grant figures reflect the Boiler Upgrade Scheme in England and Wales; see our BUS guide and the ECO4 scheme explained guide for eligibility rules.
1. Air source heat pumps: the front-runner
An air source heat pump replaces the boiler with an outdoor unit that extracts heat from the air, feeding radiators or underfloor heating and a hot water cylinder. It qualifies for the full £7,500 Boiler Upgrade Scheme grant, is straightforward for an MCS-certified installer to fit in a few days, and can produce three to four units of heat per unit of electricity when well designed.
Running costs are where design quality decides the outcome: a low flow temperature, correctly sized radiators, good insulation and a heat pump electricity tariff keep bills competitive with gas. In older or draughtier properties, read our advice on heat pumps in old houses first.
2. Hybrid heat pump and boiler systems
A hybrid keeps your existing boiler and adds a smaller heat pump, with smart controls choosing whichever is cheaper or lower-carbon at any moment. It's a genuinely useful stepping stone where the boiler still works, radiators are unproven for low temperatures, or you want to spread the investment. Most hybrid setups do not qualify for the Boiler Upgrade Scheme, because the grant requires the heat pump to be designed to meet the property's full heating demand — see our hybrid systems guide for the economics.
3. Ground source heat pumps: highest efficiency, highest cost
Ground loops buried in the garden deliver more stable temperatures than air, making ground source heat pumps the most efficient option — but with installed costs from around £18,000 even before groundworks, it suits larger properties and new builds. If you have the land and are staying long-term, the ground source vs air source comparison shows when the premium pays back.
4. Electric boilers
An electric boiler keeps your existing radiators and pipework and swaps the fuel source. Installation is quick and disruption minimal, which is why flats with gas boilers often consider them. The catch is running cost: electricity is around three to four times the price of gas per kWh, so whole-home heating on a standard tariff is expensive. They can make sense in small, well-insulated flats or on off-peak tariffs.
5. Infrared panels
Infrared panels heat people and surfaces directly rather than the air, so they warm a room quickly and need no pipework. They suit extensions, home offices, conservatories and rooms used occasionally. As a whole-home heating strategy they struggle to match wet systems on comfort and cost, and they don't provide hot water — you'd pair them with an electric cylinder or heat pump water heater.
6. Modern storage heaters
Today's high-heat-retention storage heaters are far better than the 1970s models: they charge on cheap overnight electricity and release heat through the day with thermostatic control. In off-gas homes and flats without wet heating they can be cost-effective on Economy 7 or smart off-peak tariffs. Like infrared, hot water needs a separate solution, and ECO4 sometimes funds storage heater upgrades for eligible households.
7. Biomass boilers
Pellet or chip boilers suit rural, off-gas-grid homes with space for fuel storage and flues. They run hot enough to work with existing radiators, qualify for a £5,000 Boiler Upgrade Scheme grant in off-gas properties, and are close to carbon-neutral when fuel is sustainably sourced. The trade-offs are manual or semi-automatic fuelling, ongoing maintenance and fluctuating pellet prices.
8. District heating
Heat networks pipe hot water from a shared central source to whole estates or city districts. If a network already exists near you, connection is usually the simplest low-carbon option — but you can't opt in without one, and pricing is set by the scheme operator rather than the energy market.
What about hydrogen boilers?
Hydrogen-ready boilers have been marketed as a like-for-like gas replacement, and trials continue in a few areas. But in December 2023 the government concluded hydrogen will not be used for the overwhelming majority of home heating and no national gas-network conversion is planned. Buying a hydrogen-ready boiler today means buying an efficient gas boiler with future-proofing that may never be used — worth knowing before a sales pitch sways you.
How to choose: a decision walkthrough
- Check your insulation and radiators. Loft and wall insulation, and emitters sized for low water temperatures, open the heat pump option. If radiators can't yet cope, a hybrid is a reasonable first step.
- Set a realistic budget. Compare net-of-grant costs, not just sticker prices: £14,000 installed minus £7,500 BUS is £6,500 — often less than a high-end gas boiler plus future fuel bills.
- Look at your tariff options. The right electricity tariff can cut heat pump running costs by 15–30%. See our heat pump electricity tariffs comparison.
- Check grant eligibility early. Boiler Upgrade Scheme, ECO4, pensioner grant routes, Nest Wales and Home Energy Scotland can change the maths entirely.
- Get two or three quotes from MCS-certified installers. A proper room-by-room heat-loss survey — not a one-line estimate — is the mark of a company worth using. Our installer selection guide lists the checks.
You can explore the full range of low-carbon heating options in our heating alternatives hub, get a first view of system sizing with our sizing calculator, or browse MCS-certified installers covering your area.
Frequently asked questions
What is the best alternative to a gas boiler?
For most homes, an air source heat pump: it qualifies for the £7,500 grant, provides heating and hot water, and running costs can rival gas with the right design and tariff.
Is it illegal to replace a gas boiler in the UK?
No. Gas boilers can still be replaced in existing homes. Only new-build homes are now built without gas heating under the Future Homes Standard.
What is the cheapest alternative to gas central heating?
Electric options (infrared, storage heaters, electric boilers) are cheapest to install but usually cost more to run for a whole house. Over time, a granted heat pump usually balances cost and comfort best.
Can I get a grant to replace my gas boiler?
Not for another gas boiler, but yes for low-carbon options: £7,500 towards a heat pump via the Boiler Upgrade Scheme, or fully funded installations via ECO4, Nest Wales or Home Energy Scotland if you qualify.
Are hydrogen boilers a real option?
Hydrogen-ready boilers exist, but the government decided in 2023 that hydrogen won't play a major role in home heating. Heat pumps and electric systems are the practical replacements.
Are heat pumps cheaper to run than gas boilers?
It depends on your tariff, the system's efficiency and your insulation. A well-designed heat pump on a specialist tariff can match or beat gas; on a standard variable tariff it may cost more.
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