UK 2026 / May 2026
Baxi boiler replacement cost
UK (Warwick, BDR Thermea Group)
UK 2026 installed cost range for Baxi: GBP 1,700 - GBP 2,700 depending on model + kW + install complexity. Boiler-only unit price: GBP 700 - GBP 1,450.
Position in the UK market
One of Britain's oldest boiler manufacturers (over 150 years of UK manufacturing). Solid value with strong parts availability through a large installer base.
Best for: Cost-conscious replacements where reliability and parts availability matter more than premium feel
Baxi models + prices
Unit prices are 2026 RRPs cross-checked against Heatable and BOXT installer-direct pricing. Installed cost adds GBP 700-GBP 1,500 of labour, flue, filter, flush, and Building Control on top.
| Model | Type | kW range | Unit RRP |
|---|---|---|---|
| 800 Combi | Combi | 24, 30, 36 kW | GBP 950 - GBP 1,350 |
| 600 Combi | Combi | 24, 30 kW | GBP 750 - GBP 1,000 |
| Megaflo System | System | 15, 18, 24, 32 kW | GBP 1,000 - GBP 1,400 |
| 600 Heat (regular) | Regular | 12, 15, 18, 24 kW | GBP 850 - GBP 1,150 |
Warranty
Up to 10 years (800 Combi via Baxi Works installer). Full warranty term typically requires (a) installation by an accredited installer, (b) annual service by a Gas Safe registered engineer, and (c) magnetic filter + system inhibitor fitted at install. Register the warranty within 30 days of install.
Strengths + watch-outs
Strengths
- UK manufactured, strong parts supply chain
- Affordable entry point (600 Combi from GBP 750)
- Simple controls + intuitive engineer interface
- Solid 10-year warranty on 800 Combi with Baxi Works installer
Watch-outs
- 600 series only carries a 7-year warranty as standard
- Build quality positioned for value, not premium
- Smaller smart-thermostat ecosystem vs Vaillant / Worcester Bosch native systems
Frequently asked
How much does a Baxi boiler cost installed?
Installed cost range for Baxi in UK 2026 is GBP 1,700 - GBP 2,700 all-in including supply, labour, removal, flue, filter, and Gas Safe certification. The unit itself is GBP 700 - GBP 1,450 depending on model + kW.
What warranty does Baxi offer?
Up to 10 years (800 Combi via Baxi Works installer). Full term typically requires accredited installer + annual service + magnetic filter and system inhibitor.
Is Baxi a reliable UK boiler brand?
One of Britain's oldest boiler manufacturers (over 150 years of UK manufacturing). Solid value with strong parts availability through a large installer base. Annual Gas Safe Register and Which? installer recommendation surveys consistently rate this brand in the top tier of UK domestic boiler manufacturers.
How do I find an accredited installer?
Baxi publishes an accredited installer search on their UK site. Independently, you can verify any installer at gassaferegister.co.uk. Always ask to see the Gas Safe ID card before work begins. For approved-installer status (required for the full warranty term), check the manufacturer's directly.
Compare against other brands on the by-brand index. Still deciding which type? cost by type.