The cost of a new boiler in the UK in 2025 ranges from around £1,000 to £3,500+ fully installed, depending on the boiler type, brand, and what else is involved in the installation. Here's a clear breakdown.
Combi boiler installed cost
- Budget (Baxi, Ideal entry range): £1,000–£1,400
- Mid-range (Worcester Bosch Greenstar 4000, Vaillant ecoTEC Pro): £1,400–£1,800
- Premium (Worcester Bosch Greenstar 8000, Viessmann Vitodens): £1,800–£2,500
System boiler with unvented cylinder
A system boiler installation including a new unvented cylinder typically costs £2,000–£3,500 installed. The cylinder adds £600–£1,200 to the price depending on size and brand.
What affects the price
- Boiler relocation: Moving the boiler to a new position adds £300–£800
- Power flush: If required, typically £250–£400
- New controls: Smart thermostat adds £150–£300
- Additional radiators: £150–£300 each supply and fit
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