Combi boilers are the most popular UK heating choice. We’ve reviewed the best models available in 2026.
Top Models Compared
| Brand | Model | Efficiency | From | Warranty |
|---|---|---|---|---|
| Worcester Bosch | 4000S | 94% | £1,800 | 10 years |
| Vaillant | ecoTEC Plus | 94% | £1,700 | 10 years |
| Viessmann | Vitodens 050-W | 93% | £1,500 | 10 years |
| Ideal | Vogue Max | 93% | £1,600 | 7 years |
| Baxi | 800 Combi | 92% | £1,400 | 7 years |
1. Worcester Bosch 4000S – Market Leader
Efficiency: 94% | Cost: £1,800-£2,300 fitted | Warranty: 10 years
UK’s most popular boiler with excellent reliability. 10-year warranty standard. Best long-term value.
2. Vaillant ecoTEC Plus – Premium
Efficiency: 94% | Cost: £1,700-£2,100 fitted | Warranty: 10 years
German engineering. Excellent efficiency. 10-year warranty. Premium option.
3. Viessmann Vitodens 050-W – Best Value
Efficiency: 93% | Cost: £1,500-£1,900 fitted | Warranty: 10 years
Great value for money. Solid efficiency. 10-year warranty. Best budget premium option.
4. Ideal Vogue Max – Mid-Range
Efficiency: 93% | Cost: £1,600-£2,000 fitted | Warranty: 7 years
Good efficiency. Shorter warranty than premium brands.
5. Baxi 800 Combi – Budget
Efficiency: 92% | Cost: £1,400-£1,800 fitted | Warranty: 7 years
Most affordable option. Still 92% efficiency. Shorter warranty.
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