Cost Guide
New boiler cost guide — 2026 UK prices
A straightforward breakdown of what a new boiler actually costs in 2026 — combi, system, heat-only and heat pumps — with typical installation prices and the grants available.
How much does a new boiler cost?
In the UK, a new boiler typically costs between £1,800 and £4,000 fully fitted, depending on the boiler type, brand, warranty length and how much pipework needs changing. Air-source heat pumps run higher up front but qualify for a £7,500 government grant.
Combi boiler
£1,800 – £3,000 fitted
Heats water on demand, no separate hot water cylinder needed. The most popular choice in UK homes.
Best for small to medium homes (1–3 bathrooms)
System boiler
£2,200 – £3,800 fitted
Works with a hot water cylinder so multiple taps and showers can run at once without pressure loss.
Best for larger homes with 2+ bathrooms
Heat-only (regular) boiler
£2,000 – £3,500 fitted
Uses a cold water tank in the loft plus a hot water cylinder. Common in traditional heating systems.
Best for older homes with existing tanks
Air-source heat pump
£8,000 – £14,000 fitted
Low-carbon heating. Eligible for the £7,500 Boiler Upgrade Scheme grant, bringing net cost down significantly.
Best for well-insulated homes going green
What affects the price?
- Boiler brand & warranty. Worcester Bosch and Vaillant sit at the top; Ideal, Baxi and Alpha are strong mid-range choices. Longer warranties (10–12 years) add £100–£300.
- Fuel type. Gas is cheapest to install. Oil, LPG and electric come with different pipework and flue requirements.
- Moving the boiler. Relocating from an airing cupboard to a garage or loft adds £300–£800 in pipework.
- System type change. Swapping conventional to combi means removing tanks and cylinder — usually adds £400–£800.
- Power flush. Recommended on older systems to protect the new boiler's warranty — typically £400–£600.
Grants & funding
Boiler Upgrade Scheme (BUS): £7,500 towards an air-source heat pump for owner-occupied homes in England and Wales.
ECO4: Free or heavily discounted boiler replacements for homeowners on qualifying benefits.
Interest-free finance: Available on most Worcester Bosch installs we quote for — spread the cost over 2 to 10 years.
Frequently asked questions
How much does a new boiler cost in the UK?
A new gas combi boiler typically costs £1,800 – £3,500 fully fitted, including the boiler, flue, controls and standard installation. System and heat-only boilers usually run £2,200 – £4,000, and air-source heat pumps £8,000 – £14,000 before the government Boiler Upgrade Scheme grant.
How much does a combi boiler cost fitted?
Most straightforward combi boiler swaps in Sussex land between £1,800 and £3,000 supplied and fitted, depending on brand (Worcester Bosch, Vaillant, Ideal, Baxi), warranty length, and whether pipework and flue need altering.
Is it worth upgrading to a modern condensing boiler?
Yes — modern A-rated condensing boilers are around 90%+ efficient compared to 70-80% for older non-condensing units. On an average family home, upgrading typically saves £200 – £400 a year on gas.
Are there grants for a new boiler or heat pump?
Yes. The Boiler Upgrade Scheme (BUS) offers £7,500 towards an air-source heat pump. The ECO4 scheme can fund a new boiler for eligible homeowners on qualifying benefits. We can help you check eligibility as part of your quote.
Get a fixed price for your home
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