UK 2026 / May 2026
Vaillant boiler replacement cost
Germany (Vaillant Group, Remscheid)
UK 2026 installed cost range for Vaillant: GBP 2,100 - GBP 3,600 depending on model + kW + install complexity. Boiler-only unit price: GBP 1,150 - GBP 2,200.
Position in the UK market
Europe's largest heating technology company. Strong second to Worcester Bosch in UK installer recommendations.
Best for: Households who value engineering precision, willing to pay a slight premium for German build quality
Vaillant 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 |
|---|---|---|---|
| ecoTEC Plus (combi) | Combi | 25, 30, 35, 38 kW | GBP 1,300 - GBP 1,900 |
| ecoTEC Plus (system) | System | 12, 15, 18, 25, 30 kW | GBP 1,250 - GBP 1,750 |
| ecoTEC Plus (regular) | Regular | 12, 15, 18, 24 kW | GBP 1,150 - GBP 1,650 |
| ecoFIT Pure (combi) | Combi | 25, 30, 35 kW | GBP 1,050 - GBP 1,400 |
Warranty
Up to 10 years (Advance Guarantee via Advance 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
- Quiet Mark accredited - among the quietest combis on the market
- Green iQ technology (peak energy savings via flow temperature optimisation)
- Robust stainless steel internal components
- 10-year Advance Guarantee with strong installer support
Watch-outs
- Parts pricing slightly above Worcester Bosch on like-for-like comparison
- Advance Installer network smaller than Worcester Trade Accredited
- 10-year warranty caps below Worcester Bosch / Ideal Vogue Max 12-year
Frequently asked
How much does a Vaillant boiler cost installed?
Installed cost range for Vaillant in UK 2026 is GBP 2,100 - GBP 3,600 all-in including supply, labour, removal, flue, filter, and Gas Safe certification. The unit itself is GBP 1,150 - GBP 2,200 depending on model + kW.
What warranty does Vaillant offer?
Up to 10 years (Advance Guarantee via Advance Installer). Full term typically requires accredited installer + annual service + magnetic filter and system inhibitor.
Is Vaillant a reliable UK boiler brand?
Europe's largest heating technology company. Strong second to Worcester Bosch in UK installer recommendations. 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?
Vaillant 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.