Head to head
Samsung EHS Mono HT Quiet 12.0kW vs Vaillant ecoFIT pure 825 25kW combi
The Samsung EHS Mono HT Quiet 12.0kW is a r32 monobloc air source heat pump, 12.0 kw heat output. The Vaillant ecoFIT pure 825 25kW combi is a gas combi boiler, 25.2 kw hot water output.
Last reviewed 13 September 2026
Specifications side by side
| Samsung EHS Mono HT Quiet 12.0kW | Vaillant ecoFIT pure 825 25kW combi | |
|---|---|---|
| Dimensions | 1018 x 1270 x 530 mm (H x W x D) | 700 x 390 x 295 mm |
| Weight | 137 kg | 32 kg |
| Heat output | 12.0 kW | - |
| SCOP | 4.90 (35C flow), 3.78 (55C flow) | - |
| Refrigerant | R32, 3.3 kg charge | - |
| Sound pressure | 46 dB(A) standard, 35 dB(A) night mode | - |
| Max flow temperature | 70C | - |
| Hot water output | - | 25.2 kW |
| Central heating output | - | 19.1 kW |
| ErP class | - | A |
| Seasonal efficiency | - | 94% |
| Warranty | - | 10 years when installed by Vaillant Advance installer |
| Hot water flow rate | - | 10.4 litres per minute |
Sources: Samsung EHS Mono HT Quiet 12.0kW, 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 EHS Mono HT Quiet 12.0kW if...
A 12.0kW unit for a larger house, with the highest SCOP quoted across the EHS Mono HT Quiet range at 4.90 on a 35C flow. It shares the same cabinet size as the 8kW model but weighs 11 kg more for the larger compressor.
Full EHS Mono HT Quiet 12.0kW specifications →Buy or hire the ecoFIT pure 825 25kW combi if...
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 Samsung EHS Mono HT Quiet 12.0kW and the Vaillant ecoFIT pure 825 25kW combi?
The Samsung EHS Mono HT Quiet 12.0kW is a r32 monobloc air source heat pump, 12.0 kW heat output; the Vaillant ecoFIT pure 825 25kW combi is a gas combi boiler, 25.2 kW hot water output.
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