Thermia iTec E 12 400V vs Viessmann IDU-A AWMIW.A1.19-V052 ODU 250-A AWMOF-251.A1.16-400-V002
SCOP (35 °C): Thermia iTec E 12 400V 4.69, Viessmann IDU-A AWMIW.A1.19-V052 ODU 250-A AWMOF-251.A1.16-400-V002 4.85. The Viessmann IDU-A AWMIW.A1.19-V052 ODU 250-A AWMOF-251.A1.16-400-V002 is better on 12 of 15 comparable points.
Who wins where
- Thermia iTec E 12 400V
- Viessmann IDU-A AWMIW.A1.19-V052 ODU 250-A AWMOF-251.A1.16-400-V002
Biggest differences
| Fact | iTec E 12 400V | IDU-A AWMIW.A1.19-V052 ODU 250-A AWMOF-251.A1.16-400-V002 |
|---|---|---|
| Refrigerant GWP | 675 | 3 |
| Heating capacity (A7/W35) | 12 kW | 8.5 kW |
| COP A7/W35 | 4.53 | 6.2 |
| Outdoor unit sound power | 64 dB(A) | 48 dB(A) |
| COP A2/W35 | 3.94 | 5 |
| Seasonal efficiency ηs 55 °C | 138 % | 153 % |
Score per area = position (0–100) relative to all 1350 models in this category; higher is better.
| Technical specifications | ThermiaiTec E 12 400V | ViessmannIDU-A AWMIW.A1.19-V052 ODU 250-A AWMOF-251.A1.16-400-V002 |
|---|---|---|
| Grants & market | ||
| Boiler Upgrade Scheme | £7,500 – £9,000 | £7,500 – £9,000 |
| General | ||
| Type (source) | Air-to-water 1 | Air-to-water 1 |
| Performance | ||
| Heating capacity (A7/W35) | 12 kW ✓ 2 | 8.5 kW 3 |
| Rated output 35 °C | 13 kW 1 | 13.29 kW ✓ 1 |
| Rated output 55 °C | 12 kW 1 | 12.09 kW ✓ 1 |
| Min. outdoor temperature | – | -20 °C 3 |
| Efficiency | ||
| SCOP (35 °C) | 4.69 1 | 4.85 ✓ 1 |
| SCOP (55 °C) | 3.53 1 | 3.9 ✓ 1 |
| Seasonal efficiency ηs 35 °C | 185 % 1 | 190 % ✓ 1 |
| Seasonal efficiency ηs 55 °C | 138 % 1 | 153 % ✓ 1 |
| Energy label 35 °C | A, , , 2 | A, , , 3 |
| Energy label 55 °C | A, , 2 | A, , , 3 |
| COP A7/W35 | 4.53 1 | 6.2 ✓ 1 |
| COP A2/W35 | 3.94 1 | 5 ✓ 1 |
| COP A-7/W35 | 2.66 1 | 2.8 ✓ 1 |
| Noise | ||
| Outdoor unit sound power | 64 dB(A) 1 | 48 dB(A) ✓ 1 |
| Indoor unit sound power | 40 dB(A) 1 | 40 dB(A) 1 |
| Refrigerant | ||
| Refrigerant | R32 1 | R290 1 |
| Refrigerant GWP | 675 2 | 3 ✓ 3 |
| Refrigerant charge | 2.2 kg 1 | 2 kg ✓ 1 |
| Electrical | ||
| Max. power input | 3.73 kW 1 | 1.6 kW 1 |
| Connectivity & smart | ||
| SG Ready | Yes 1 | Yes 1 |
Sources
- List of eligible heat pumps (BEG) — Bundesamt für Wirtschaft und Ausfuhrkontrolle (BAFA) · accessed 27 Sept 2026
- Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed 29 Sept 2026
- Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed 29 Sept 2026