New Boiler Installation Cost

Typical new boiler prices

Combi-to-combi swap: from around £1,900–£2,500 including the boiler, fitting, controls and VAT. System boiler with unvented cylinder: £3,000–£4,500+. Full conversion (e.g. back boiler to combi, or conventional to system): £3,500–£6,000+ depending on pipework and property.

What's included in the price?

Free home survey, the boiler itself, all labour and fittings, system flush if required, magnetic filter, wireless thermostat or smart controls, removal of the old boiler, Gas Safe registration, building control notification and manufacturer warranty registration.

What affects the final price?

Boiler brand and model, flue length and routing, pipework modifications, location changes (e.g. moving the boiler upstairs), system complexity (multiple zones, unvented cylinders), and whether a power flush is needed.

Request a free, no-obligation survey and fixed quote for your new boiler.

Call 07932 898534

Frequently asked questions

Do you offer finance?

We can discuss payment options — contact us for details.

How long is the warranty on a new boiler?

Manufacturer warranties range from 5 to 12 years depending on brand and model, provided the boiler is serviced annually by a Gas Safe engineer.

Boiler Installation in your area

Book boiler installation in any KT or TW town — every location has its own local page.

Gas Safe Registered

Qualified & certified engineers

Highly Rated Locally

Reviews from KT & TW customers

Genuinely Local

Engineers based in the area

Same-Day Availability

Where possible, for urgent jobs

New Boiler Installation Cost — What to Expect