Head to head
Daikin Altherma 3 H HT EPRA14DV3 vs Vaillant ecoTEC plus 825 25kW combi
The Daikin Altherma 3 H HT EPRA14DV3 is a r32 monobloc high-temperature air source heat pump, class 14. The Vaillant ecoTEC plus 825 25kW combi is a gas combi boiler, 25.4 kw hot water output.
Last reviewed 13 September 2026
Specifications side by side
| Daikin Altherma 3 H HT EPRA14DV3 | Vaillant ecoTEC plus 825 25kW combi | |
|---|---|---|
| Dimensions | 990 x 1270 x 460 mm (H x W x D) (outdoor unit) | 720 x 440 x 338 mm |
| Weight | 146 kg (single-phase) (outdoor unit) | 36 kg |
| Heat output | 10.17 kW (nominal heating) | - |
| SCOP | 4.51-4.71 (35C flow), 3.57-3.58 (55C flow) | - |
| Refrigerant | R32, 4.2 kg charge | - |
| Sound pressure | 43 dBA (heating) | - |
| Max flow temperature | 70C | - |
| Hot water output | - | 25.4 kW |
| Central heating output | - | 20.8 kW |
| ErP class | - | A |
| Seasonal efficiency | - | 94% |
| Warranty | - | 10 years with Vaillant Advance Boiler Protection Kit |
| Hot water flow rate | - | 10.5 litres per minute |
Sources: Daikin Altherma 3 H HT EPRA14DV3, Vaillant ecoTEC plus 825 25kW combi. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Altherma 3 H HT EPRA14DV3 if...
A high-temperature monobloc heat pump reaching a 70C flow, aimed squarely at replacing a boiler on an existing radiator system without upgrading radiators. Its class 14 size gives around 10.2kW of heat output, suiting a three or four-bed house.
Full Altherma 3 H HT EPRA14DV3 specifications →Buy or hire the ecoTEC plus 825 25kW combi if...
A gas combi boiler with 25.4 kW of hot water output, sized for a flat or small house with one bathroom. It delivers about 10.5 litres per minute of hot water, which decides how well a shower runs while a tap is on. Warranty: 10 years with Vaillant Advance Boiler Protection Kit. Seasonal efficiency is 94%.
Full ecoTEC plus 825 25kW combi specifications →Common questions
What is the difference between the Daikin Altherma 3 H HT EPRA14DV3 and the Vaillant ecoTEC plus 825 25kW combi?
The Daikin Altherma 3 H HT EPRA14DV3 is a r32 monobloc high-temperature air source heat pump, class 14; the Vaillant ecoTEC plus 825 25kW combi is a gas combi boiler, 25.4 kW hot water output.
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