UK 2026 / May 2026
Viessmann boiler replacement cost
Germany (Allendorf)
UK 2026 installed cost range for Viessmann: GBP 2,400 - GBP 4,000 depending on model + kW + install complexity. Boiler-only unit price: GBP 1,350 - GBP 2,400.
Position in the UK market
Premium German manufacturer renowned for stainless steel heat exchangers and engineering excellence.
Best for: Households prioritising longevity and willing to pay top-end UK domestic boiler pricing
Viessmann 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 |
|---|---|---|---|
| Vitodens 050-W (combi) | Combi | 30, 35 kW | GBP 1,200 - GBP 1,550 |
| Vitodens 100-W (combi) | Combi | 25, 30, 35 kW | GBP 1,500 - GBP 1,950 |
| Vitodens 200-W (combi) | Combi | 25, 32, 35 kW | GBP 2,000 - GBP 2,400 |
| Vitodens 100-W (system) | System | 19, 26, 32 kW | GBP 1,350 - GBP 1,800 |
Warranty
Up to 10 years (Vitodens 100-W via Trained 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
- Stainless steel inox-radial heat exchanger (longer life than aluminium)
- MatriX cylinder burner (efficient modulation)
- Built-in WiFi on 100-W and 200-W
- Premium build quality and feel
Watch-outs
- Highest UK domestic price band
- Trained Installer network smaller than Worcester Bosch / Vaillant
- Vitodens 200-W has a 5-year standard warranty (extendable to 10 with annual service)
Frequently asked
How much does a Viessmann boiler cost installed?
Installed cost range for Viessmann in UK 2026 is GBP 2,400 - GBP 4,000 all-in including supply, labour, removal, flue, filter, and Gas Safe certification. The unit itself is GBP 1,350 - GBP 2,400 depending on model + kW.
What warranty does Viessmann offer?
Up to 10 years (Vitodens 100-W via Trained Installer). Full term typically requires accredited installer + annual service + magnetic filter and system inhibitor.
Is Viessmann a reliable UK boiler brand?
Premium German manufacturer renowned for stainless steel heat exchangers and engineering excellence. 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?
Viessmann 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.