Head to head
Baxi 600 Combi 2 24kW vs Baxi 800 Combi 2 36kW
The Baxi 800 Combi 2 36kW runs 4.8 litres a minute more hot water and comes with 3 years more warranty.
Last reviewed 13 September 2026
Key differences
- Hot water flow rate: the Baxi 800 Combi 2 36kW runs 4.8 litres a minute more hot water.
- Warranty: the Baxi 800 Combi 2 36kW comes with 3 years more warranty.
- Hot water output: the Baxi 800 Combi 2 36kW has 10kW more hot water output.
- Central heating output: the Baxi 800 Combi 2 36kW puts out 5kW more to the radiators.
Specifications side by side
| Baxi 600 Combi 2 24kW | Baxi 800 Combi 2 36kW | |
|---|---|---|
| Hot water output | 25.8 kW | 36 kW |
| Central heating output | 21.2 kW | 26.4 kW |
| ErP class | A | A |
| Seasonal efficiency | 93% | 93% |
| Dimensions | 700 x 395 x 297 mm | 700 x 390 x 285 mm |
| Weight | 29.5 kg | 29.5 kg |
| Warranty | 7 years | 10 years |
| Hot water flow rate | 10.2 litres per minute | 15 litres per minute |
Sources: Baxi 600 Combi 2 24kW, Baxi 800 Combi 2 36kW. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the 600 Combi 2 24kW if...
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 800 Combi 2 36kW if...
- you want one that runs 4.8 litres a minute more hot water
- you want one that comes with 3 years more warranty
- you want one that has 10kW more hot water output
- you want one that puts out 5kW more to the radiators
A gas combi boiler with 36 kW of hot water output, sized for a larger house with two bathrooms. It delivers about 15 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 36kW specifications →Common questions
What is the difference between the Baxi 600 Combi 2 24kW and the Baxi 800 Combi 2 36kW?
The Baxi 800 Combi 2 36kW runs 4.8 litres a minute more hot water and comes with 3 years more warranty. The Baxi 600 Combi 2 24kW is a gas combi boiler, 25.8 kW hot water output; the Baxi 800 Combi 2 36kW is a gas combi boiler, 36 kW hot water output.
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