Head to head
Baxi 600 Combi 2 24kW vs Vaillant ecoFIT pure 825 25kW combi
The Vaillant ecoFIT pure 825 25kW combi comes with 3 years more warranty and runs 0.2 litres a minute more hot water. The Baxi 600 Combi 2 24kW puts out 2kW more to the radiators and has 1kW more hot water output.
Last reviewed 13 September 2026
Key differences
- Warranty: the Vaillant ecoFIT pure 825 25kW combi comes with 3 years more warranty.
- Central heating output: the Baxi 600 Combi 2 24kW puts out 2kW more to the radiators.
- Hot water output: the Baxi 600 Combi 2 24kW has 1kW more hot water output.
- Hot water flow rate: the Vaillant ecoFIT pure 825 25kW combi runs 0.2 litres a minute more hot water.
- Seasonal efficiency: the Vaillant ecoFIT pure 825 25kW combi is 1 points more efficient.
Specifications side by side
| Baxi 600 Combi 2 24kW | Vaillant ecoFIT pure 825 25kW combi | |
|---|---|---|
| Hot water output | 25.8 kW | 25.2 kW |
| Central heating output | 21.2 kW | 19.1 kW |
| ErP class | A | A |
| Seasonal efficiency | 93% | 94% |
| Dimensions | 700 x 395 x 297 mm | 700 x 390 x 295 mm |
| Weight | 29.5 kg | 32 kg |
| Warranty | 7 years | 10 years when installed by Vaillant Advance installer |
| Hot water flow rate | 10.2 litres per minute | 10.4 litres per minute |
Sources: Baxi 600 Combi 2 24kW, Vaillant ecoFIT pure 825 25kW combi. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the 600 Combi 2 24kW if...
- you want one that puts out 2kW more to the radiators
- you want one that has 1kW more hot water output
A gas combi boiler with 25.8 kW of hot water output, sized for a flat or small house with one bathroom. It delivers about 10.2 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 7 years. Seasonal efficiency is 93%.
Full 600 Combi 2 24kW specifications →Buy or hire the ecoFIT pure 825 25kW combi if...
- you want one that comes with 3 years more warranty
- you want one that runs 0.2 litres a minute more hot water
- you want one that is 1 points more efficient
A gas combi boiler with 25.2 kW of hot water output, sized for a flat or small house with one bathroom. It delivers about 10.4 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 10 years when installed by Vaillant Advance installer. Seasonal efficiency is 94%.
Full ecoFIT pure 825 25kW combi specifications →Common questions
What is the difference between the Baxi 600 Combi 2 24kW and the Vaillant ecoFIT pure 825 25kW combi?
The Vaillant ecoFIT pure 825 25kW combi comes with 3 years more warranty and runs 0.2 litres a minute more hot water. The Baxi 600 Combi 2 24kW puts out 2kW more to the radiators and has 1kW more hot water output. The Baxi 600 Combi 2 24kW is a gas combi boiler, 25.8 kW hot water output; the Vaillant ecoFIT pure 825 25kW combi is a gas combi boiler, 25.2 kW hot water output.
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