Head to head
Baxi 600 Combi 2 24kW vs Vaillant aroTHERM plus 5kW
The Baxi 600 Combi 2 24kW is a gas combi boiler, 25.8 kw hot water output. The Vaillant aroTHERM plus 5kW is a r290 monobloc air source heat pump, 5 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Baxi 600 Combi 2 24kW | Vaillant aroTHERM plus 5kW | |
|---|---|---|
| Dimensions | 700 x 395 x 297 mm | 965 x 1100 x 450 mm (H x W x D) |
| Weight | 29.5 kg | 128 kg (operating) |
| Hot water output | 25.8 kW | - |
| Central heating output | 21.2 kW | - |
| ErP class | A | - |
| Seasonal efficiency | 93% | - |
| Warranty | 7 years | - |
| Hot water flow rate | 10.2 litres per minute | - |
| Heat output | - | 5 kW |
| SCOP | - | up to 5.03 |
| Refrigerant | - | R290 (propane), low GWP |
| Sound power | - | 53 dB(A) at A7/W35, 58 dB(A) at A7/W55 |
| Max flow temperature | - | 75C |
Sources: Baxi 600 Combi 2 24kW, Vaillant aroTHERM plus 5kW. 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 aroTHERM plus 5kW if...
The smallest aroTHERM plus, sized for a well-insulated flat or small house. It uses the natural refrigerant R290 rather than an F-gas, and reaches a 75C flow temperature, which helps it work with existing radiators on a retrofit job.
Full aroTHERM plus 5kW specifications →Common questions
What is the difference between the Baxi 600 Combi 2 24kW and the Vaillant aroTHERM plus 5kW?
The Baxi 600 Combi 2 24kW is a gas combi boiler, 25.8 kW hot water output; the Vaillant aroTHERM plus 5kW is a r290 monobloc air source heat pump, 5 kW heat output.
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