Head to head
Baxi 800 Combi 2 30kW vs Vaillant ecoTEC Pro 24kW combi
The Baxi 800 Combi 2 30kW comes with 8 years more warranty and has 7kW more hot water output. The Vaillant ecoTEC Pro 24kW combi puts out 4kW more to the radiators.
Last reviewed 13 September 2026
Key differences
- Warranty: the Baxi 800 Combi 2 30kW comes with 8 years more warranty.
- Hot water output: the Baxi 800 Combi 2 30kW has 7kW more hot water output.
- Hot water flow rate: the Baxi 800 Combi 2 30kW runs 2.6 litres a minute more hot water.
- Central heating output: the Vaillant ecoTEC Pro 24kW combi puts out 4kW more to the radiators.
Specifications side by side
| Baxi 800 Combi 2 30kW | Vaillant ecoTEC Pro 24kW combi | |
|---|---|---|
| Hot water output | 30 kW | 23.4 kW |
| Central heating output | 21.2 kW | 24.8 kW |
| ErP class | A | A |
| Seasonal efficiency | 93% | 93% |
| Dimensions | 700 x 390 x 285 mm | 720 x 440 x 338 mm |
| Warranty | 10 years | 2 years standard, 7 years with Vaillant Advance registration |
| Hot water flow rate | 12.2 litres per minute | 9.6 litres per minute |
| Weight | - | 38 kg |
Sources: Baxi 800 Combi 2 30kW, Vaillant ecoTEC Pro 24kW combi. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the 800 Combi 2 30kW if...
- you want one that comes with 8 years more warranty
- you want one that has 7kW more hot water output
- you want one that runs 2.6 litres a minute more hot water
A gas combi boiler with 30 kW of hot water output, sized for a three-bed house with one or two bathrooms. It delivers about 12.2 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 10 years. Seasonal efficiency is 93%.
Full 800 Combi 2 30kW specifications →Buy or hire the ecoTEC Pro 24kW combi if...
- you want one that puts out 4kW more to the radiators
A gas combi boiler with 23.4 kW of hot water output, sized for a flat or small house with one bathroom. It delivers about 9.6 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 2 years standard, 7 years with Vaillant Advance registration. Seasonal efficiency is 93%.
Full ecoTEC Pro 24kW combi specifications →Common questions
What is the difference between the Baxi 800 Combi 2 30kW and the Vaillant ecoTEC Pro 24kW combi?
The Baxi 800 Combi 2 30kW comes with 8 years more warranty and has 7kW more hot water output. The Vaillant ecoTEC Pro 24kW combi puts out 4kW more to the radiators. The Baxi 800 Combi 2 30kW is a gas combi boiler, 30 kW hot water output; the Vaillant ecoTEC Pro 24kW combi is a gas combi boiler, 23.4 kW hot water output.
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