How Much Does a New Boiler Cost UK 2026? Full Price Breakdown
The total cost of a new boiler, including supply and installation, typically falls between £1,800 and £4,000 for a standard gas combi boiler.
Replacing a boiler is one of those jobs most homeowners face eventually. Prices have risen in recent years, but a new A-rated condensing boiler typically cuts gas consumption by 20 to 30 per cent compared to a boiler over 10 years old, which goes some way to offsetting the cost.
The total cost of a new boiler, including supply and installation, typically falls between £1,800 and £4,000 for a standard gas combi boiler.
Boiler Costs by Type
- Combi boiler (supply and fit): £1,800 to £3,500
- System boiler with cylinder: £2,500 to £5,000
- Heat-only (regular) boiler with cylinder: £2,200 to £4,500
- Oil boiler: £2,500 to £5,000
- LPG boiler: £2,200 to £4,500
What Affects the Price?
- Boiler brand — Worcester Bosch and Vaillant are among the most reliable and carry warranties up to 12 years; budget brands cost less upfront but warranties are shorter
- Whether the flue position changes — a new flue route adds labour cost
- Whether a magnetic filter, scale reducer, or new thermostatic radiator valves are included
- Whether a powerflush is needed to clean the system before installation
- Location — London and South East installation costs run higher
Getting Quotes
Get at least three quotes from Gas Safe registered installers. Make sure each specifies the boiler model and output (kW), what's included, and the warranty offered. Check each installer on the Gas Safe Register at gassaferegister.co.uk before work starts.
Finance and Grants
Many installers offer 0 per cent or low-rate finance for boiler replacement. The government's Boiler Upgrade Scheme provides grants of £7,500 for homeowners switching to a heat pump, though standard gas boiler replacements don't currently qualify. If you're on benefits or low income, the Energy Company Obligation (ECO4) scheme may provide free or subsidised replacement — contact your energy supplier to check eligibility.
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