Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M) vs Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001
SCOP (35 °C): Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M) 4.56, Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001 4.44. The Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M) is better on 7 of 13 comparable points.
Both models in detail
Who wins where
- Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M)
- Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001
Biggest differences
| Fact | Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M) | Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001 |
|---|---|---|
| COP A7/W35 | 4.81 | 6.2 |
| COP A-7/W35 | 2.35 | 3 |
| Refrigerant charge | 0.95 kg | 1.2 kg |
| Outdoor unit sound power | 42 dB(A) | 48 dB(A) |
| Indoor unit sound power | 37 dB(A) | 40 dB(A) |
| Rated output 55 °C | 6.6 kW | 6.17 kW |
Score per area = position (0–100) relative to all 1350 models in this category; higher is better.
| Technical specifications | BoschCompress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M) | ViessmannVitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001 |
|---|---|---|
| General | ||
| Type (source) | Air-to-water1 | Air-to-water1 |
| Performance | ||
| Heating capacity (A7/W35) | – | 5.6 kW2 |
| Rated output 35 °C | 6.6 kW✓1 | 6.47 kW1 |
| Rated output 55 °C | 6.6 kW✓1 | 6.17 kW1 |
| Min. outdoor temperature | – | -20 °C2 |
| Efficiency | ||
| SCOP (35 °C) | 4.56✓1 | 4.441 |
| SCOP (55 °C) | 3.481 | 3.58✓1 |
| Seasonal efficiency ηs 35 °C | 179 %✓1 | 176 %1 |
| Seasonal efficiency ηs 55 °C | 136 %1 | 140 %✓1 |
| Energy label 35 °C | – | A+++2 |
| Energy label 55 °C | – | A++2 |
| COP A7/W35 | 4.811 | 6.2✓1 |
| COP A2/W35 | 4.031 | 4.2✓1 |
| COP A-7/W35 | 2.351 | 3✓1 |
| SEER (cooling) | 2.561 | – |
| Noise | ||
| Outdoor unit sound power | 42 dB(A)✓1 | 48 dB(A)1 |
| Indoor unit sound power | 37 dB(A)✓1 | 40 dB(A)1 |
| Refrigerant | ||
| Refrigerant | R2901 | R2901 |
| Refrigerant GWP | – | 32 |
| Refrigerant charge | 0.95 kg✓1 | 1.2 kg1 |
| Electrical | ||
| Max. power input | 3.15 kW1 | 1.14 kW1 |
| Connectivity & smart | ||
| SG Ready | Yes1 | Yes1 |
Frequently asked questions
Which is better: the Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M) or the Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001?
SCOP (35 °C): Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M) 4.56, Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001 4.44. The Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M) is better on 7 of 13 comparable points.
What is the SCOP (35 °C) of the Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M) and the Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001?
Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M): 4.56. Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001: 4.44.
Which is better on COP A7/W35: the Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M) or the Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001?
Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001: 6.2. Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M): 4.81.
Which is better on COP A-7/W35: the Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M) or the Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001?
Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001: 3. Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M): 2.35.
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How we collect and check this data →
Sources
- 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