Head to head
Baxi 800 Combi 2 36kW vs Daikin Altherma 3 H HT EPRA16DV3
The Baxi 800 Combi 2 36kW is a gas combi boiler, 36 kw hot water output. The Daikin Altherma 3 H HT EPRA16DV3 is a r32 monobloc high-temperature air source heat pump, class 16.
Last reviewed 13 September 2026
Specifications side by side
| Baxi 800 Combi 2 36kW | Daikin Altherma 3 H HT EPRA16DV3 | |
|---|---|---|
| Dimensions | 700 x 390 x 285 mm | 990 x 1270 x 460 mm (H x W x D) (outdoor unit) |
| Weight | 29.5 kg | 146 kg (single-phase) (outdoor unit) |
| Hot water output | 36 kW | - |
| Central heating output | 26.4 kW | - |
| ErP class | A | - |
| Seasonal efficiency | 93% | - |
| Warranty | 10 years | - |
| Hot water flow rate | 15 litres per minute | - |
| Heat output | - | 11.57-11.82 kW |
| SCOP | - | 4.51-4.71 (35C flow), 3.57-3.58 (55C flow) |
| Refrigerant | - | R32, 4.2 kg charge |
| Sound pressure | - | 38 dBA at 3m (standard mode), 35 dBA at 3m (low sound mode) |
| Max flow temperature | - | 70C |
Sources: Baxi 800 Combi 2 36kW, Daikin Altherma 3 H HT EPRA16DV3. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the 800 Combi 2 36kW if...
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 →Buy or hire the Altherma 3 H HT EPRA16DV3 if...
The next size up in the Altherma 3 H HT range at around 11.7kW, still reaching a 70C flow for boiler-replacement jobs. It shares the same outdoor cabinet size and weight as the class 14 unit, so it suits a larger house without a larger footprint.
Full Altherma 3 H HT EPRA16DV3 specifications →Common questions
What is the difference between the Baxi 800 Combi 2 36kW and the Daikin Altherma 3 H HT EPRA16DV3?
The Baxi 800 Combi 2 36kW is a gas combi boiler, 36 kW hot water output; the Daikin Altherma 3 H HT EPRA16DV3 is a r32 monobloc high-temperature air source heat pump, class 16.
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