Combi boiler replacement cost: what you will really pay
What it costs to replace a combi boiler in 2026, what pushes the price up, and how to avoid overpaying.
Replacing a combi is the most common boiler job in the UK, and the good news is it is usually the most affordable. Here is what you will really pay in 2026.
Typical combi replacement prices
For a like-for-like combi swap, where the new boiler goes where the old one was, expect roughly:
- Value brands (Baxi, Glow-worm): around £1,800 to £2,200
- Mid-range (Ideal, Vaillant ecoFit): around £2,200 to £2,600
- Premium (Worcester Bosch 8000, Vaillant ecoTEC plus): around £2,600 to £2,900
You can see real installed-from prices on our boiler catalogue. For the full market picture, our best boiler brands compared guide is a good read, as are the independent reviews at Which?.
What pushes the price up
- Moving the boiler to a new spot (extra pipework and a new flue)
- A bigger output for a larger home, see what size boiler do I need
- Old or sludgy pipework needing a flush or a filter
- Premium brand and longer warranty
How to avoid overpaying
Fixed-price installers like Norvera give you a written price before any work starts, so it cannot creep up on the day. Compare that to some services where extras get added mid-job. Bundling in a magnetic filter protects your new boiler and can save on future repairs.
Get your combi price
The only way to know your exact price is a quick assessment. Get a fixed quote in a couple of minutes, with no obligation.
Frequently asked questions
How much does it cost to replace a combi boiler?+
A like-for-like combi replacement usually costs between about £1,800 and £2,800 fully fitted. Premium brands or a bigger boiler push it higher, and moving the boiler adds more.
Is a combi cheaper than a system boiler?+
A like-for-like combi swap is usually the cheapest job because there is no cylinder or tank work. Converting from a system to a combi costs more because of the extra pipework.
Does the price include removing the old boiler?+
With Norvera, yes. The fixed price covers the new boiler, installation, removal of the old one and warranty registration, with no surprises on the day.
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