NIBE S2125-20 3X400V vs Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.10-400-V001
SCOP (35 °C): NIBE S2125-20 3X400V 5.3, Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.10-400-V001 5.27. The NIBE S2125-20 3X400V is better on 8 of 13 comparable points.
Both models in detail
Who wins where
- NIBE S2125-20 3X400V
- Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.10-400-V001
Biggest differences
| Fact | S2125-20 3X400V | Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.10-400-V001 |
|---|---|---|
| Refrigerant charge | 1.15 kg | 2 kg |
| Heating capacity (A7/W35) | 11.38 kW | 7.35 kW |
| COP A7/W35 | 5 | 6.63 |
| Rated output 55 °C | 11 kW | 9.37 kW |
| Indoor unit sound power | 35 dB(A) | 40 dB(A) |
| Outdoor unit sound power | 55 dB(A) | 49 dB(A) |
Score per area = position (0–100) relative to all 1350 models in this category; higher is better.
| Technical specifications | NIBES2125-20 3X400V | ViessmannVitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.10-400-V001 |
|---|---|---|
| General | ||
| Type (source) | Air-to-water1 | Air-to-water2 |
| Performance | ||
| Heating capacity (A7/W35) | 11.38 kW✓1 | 7.35 kW3 |
| Rated output 35 °C | 11 kW✓4 | 9.8 kW2 |
| Rated output 55 °C | 11 kW✓4 | 9.37 kW2 |
| Min. outdoor temperature | -22 °C✓1 | -20 °C3 |
| Efficiency | ||
| SCOP (35 °C) | 5.3✓4 | 5.272 |
| SCOP (55 °C) | 4.084 | 4.17✓2 |
| Seasonal efficiency ηs 35 °C | 209 %✓4 | 208 %2 |
| Seasonal efficiency ηs 55 °C | 160 %4 | 164 %✓2 |
| Energy label 35 °C | A+++4 | A+++3 |
| Energy label 55 °C | A+++4 | A+++3 |
| COP A7/W35 | 51 | 6.63✓2 |
| COP A2/W35 | – | 5.252 |
| COP A-7/W35 | – | 3.442 |
| Noise | ||
| Outdoor unit sound power | 55 dB(A)4 | 49 dB(A)✓2 |
| Indoor unit sound power | 35 dB(A)✓4 | 40 dB(A)2 |
| Refrigerant | ||
| Refrigerant | R2901 | R2902 |
| Refrigerant GWP | 31 | 33 |
| Refrigerant charge | 1.15 kg✓1 | 2 kg2 |
| Electrical | ||
| Max. power input | – | 1.34 kW2 |
| Connectivity & smart | ||
| SG Ready | – | Yes2 |
Frequently asked questions
Which is better: the NIBE S2125-20 3X400V or the Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.10-400-V001?
SCOP (35 °C): NIBE S2125-20 3X400V 5.3, Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.10-400-V001 5.27. The NIBE S2125-20 3X400V is better on 8 of 13 comparable points.
What is the SCOP (35 °C) of the NIBE S2125-20 3X400V and the Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.10-400-V001?
NIBE S2125-20 3X400V: 5.3. Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.10-400-V001: 5.27.
Which is better on refrigerant charge: the NIBE S2125-20 3X400V or the Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.10-400-V001?
NIBE S2125-20 3X400V: 1.15 kg. Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.10-400-V001: 2 kg.
Which is better on heating capacity (A7/W35): the NIBE S2125-20 3X400V or the Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.10-400-V001?
NIBE S2125-20 3X400V: 11.38 kW. Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.10-400-V001: 7.35 kW.
Related comparisons
- NIBES2125-20 3X400VvsSTIEBEL ELTRONWPL-A 10.2 Plus HK 400
- BoschCompress CS6800iAW 12 ORM-T (AW 12 OR-T + CS6800iAW 12 M)vsNIBES2125-20 3X400V
- BuderusLogatherm WLW176i-12 AR EvsNIBES2125-20 3X400V
- STIEBEL ELTRONLWZ 8 CS TrendvsViessmannVitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.10-400-V001
- GreeGRS-CQ12PdG/NhH2-MvsNIBEF2120-20
- ViessmannVitocal 150-A IDU-A AWMIW.A1.19-V052 / ODU 150-A AWMOF-151.A1.13-230-V001vsWaterkotteEcoTouch Air Bloc 7016
How we collect and check this data →
Sources
- Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed Sep 29, 2026
- List of eligible heat pumps (BEG) — Bundesamt für Wirtschaft und Ausfuhrkontrolle (BAFA) · accessed Sep 27, 2026
- Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed Sep 29, 2026
- European Product Registry for Energy Labelling (EPREL) – heat pumps — Europese Commissie · accessed Oct 15, 2026