UK 2026 / Reviewed October 2026
Boiler replacement cost by brand
Five UK domestic boiler manufacturers compared on what is published: fixed installed prices from BOXT, an online installer that lists prices (checked 22 October 2026), and each manufacturer's own warranty terms. Baxi and Viessmann have no published installed price, so their row says so. Click into any brand for model-by-model detail.
Side-by-side
| Brand | Installed from (BOXT) | Warranty |
|---|---|---|
| Worcester Bosch | £2,199 | Up to 12 years on the Greenstar 8000 Life when fitted by a Worcester Bosch Accredited Installer |
| Vaillant | £2,519 | Up to 10 years on ecoTEC plus, ecoTEC exclusive and ecoFIT pure (up to 45 kW) with the Advance Boiler Protection Kit, registered through Advance |
| Ideal | £1,699 | Up to 12 years on Vogue Max combi and system; 10 years on Logic Max combi, system and heat |
| Baxi | Not published | 10 years on the 800 Combi 2 and 800 System 2; 7 years on the 600 Combi 2 and 600 System 2 |
| Viessmann | Not published | 2 years standard, 7 years free on registration; Vitodens 100-W and 200-W can be extended to 10 or 12 years for a fee |
The five brands at a glance
Worcester Bosch
Installed from £2,199
UK (Worcester), part of the Bosch group
Up to 12 years on the Greenstar 8000 Life when fitted by a Worcester Bosch Accredited Installer.
Vaillant
Installed from £2,519
Germany (Remscheid), Vaillant Group
Up to 10 years on ecoTEC plus, ecoTEC exclusive and ecoFIT pure (up to 45 kW) with the Advance Boiler Protection Kit, registered through Advance.
Ideal
Installed from £1,699
UK (Hull)
Up to 12 years on Vogue Max combi and system; 10 years on Logic Max combi, system and heat.
Baxi
No published installed price
UK, part of BDR Thermea Group
10 years on the 800 Combi 2 and 800 System 2; 7 years on the 600 Combi 2 and 600 System 2.
Viessmann
No published installed price
Germany (Allendorf)
2 years standard, 7 years free on registration; Vitodens 100-W and 200-W can be extended to 10 or 12 years for a fee.
How to compare quotes across brands
- Read the warranty conditions, not the headline years. The longest terms depend on an accredited installer, a specific filter fitted at install, registration within 30 days, or a paid extension (Viessmann).
- Treat a "from" price as a floor. It is for the smallest output in a like-for-like swap. Type changes, boiler moves and bigger outputs cost more.
- Get at least three written quotes for the same model and output, so the brand is the only thing that differs.
Brand decision usually settles after the type decision. If you're not sure which type yet, start with cost by boiler type.