How much is a new combi boiler fitted?

A straight combi replacement with a mid-range brand typically costs £1,800 to £2,800 supplied and fitted. Premium brands and longer warranties cost more.

Is it worth converting to a combi?

Converting from a system or conventional boiler to a combi removes the tanks and frees up space, but it adds £700 to £1,500 to the job because of the extra pipework and controls.

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How much does a new boiler cost in the UK?

A new boiler is priced by the type of swap and the brand. A straight combi-for-combi replacement is cheapest, and moving the boiler or changing system type costs more.

From

£1,800

Typical

£3,000

Up to

£4,500

supplied and fitted · typical UK job, 2026

Time on site: 1 day for a straight swap, 2 to 3 days for a conversion or relocation

Price your new boiler

Adjust for your job and area to get a range.

What's included in the price

The boiler and standard flue
Installation and commissioning
A system flush
Manufacturer warranty registration

What changes the cost

Combi swap versus changing to or from a system boiler
Brand and warranty length
Whether the boiler is moved to a new location
Controls, filters and any pipework changes

Costs by area

London adds around 15 to 25 percent on labour. The boiler itself costs about the same everywhere.

Common questions

How much is a new combi boiler fitted?: A straight combi replacement with a mid-range brand typically costs £1,800 to £2,800 supplied and fitted. Premium brands and longer warranties cost more.
Is it worth converting to a combi?: Converting from a system or conventional boiler to a combi removes the tanks and frees up space, but it adds £700 to £1,500 to the job because of the extra pipework and controls.

These are independent guide prices based on typical UK jobs in 2026. Your actual cost depends on your property, spec, access and where you live. Always get at least three written quotes before committing.