Bosch Compress CS6800iAW 12 ORM-T (AW 12 OR-T + CS6800iAW 12 M) vs NIBE S2125-20 3X400V
SCOP (35 °C): Bosch Compress CS6800iAW 12 ORM-T (AW 12 OR-T + CS6800iAW 12 M) 4.64, NIBE S2125-20 3X400V 5.3. The NIBE S2125-20 3X400V is better on 7 of 10 comparable points.
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Both models in detail
Who wins where
- Bosch Compress CS6800iAW 12 ORM-T (AW 12 OR-T + CS6800iAW 12 M)
- NIBE S2125-20 3X400V
Biggest differences
| Fact | Compress CS6800iAW 12 ORM-T (AW 12 OR-T + CS6800iAW 12 M) | S2125-20 3X400V |
|---|---|---|
| Refrigerant charge | 1.6 kg | 1.15 kg |
| Outdoor unit sound power | 45 dB(A) | 55 dB(A) |
| Seasonal efficiency ηs 55 °C | 136 % | 160 % |
| SCOP (55 °C) | 3.48 | 4.08 |
| Indoor unit sound power | 40 dB(A) | 35 dB(A) |
| SCOP (35 °C) | 4.64 | 5.3 |
Score per area = position (0–100) relative to all 1350 models in this category; higher is better.
| Technical specifications | BoschCompress CS6800iAW 12 ORM-T (AW 12 OR-T + CS6800iAW 12 M) | NIBES2125-20 3X400V |
|---|---|---|
| Grants & market | ||
| Boiler Upgrade Scheme | £7,500 – £9,000 | £7,500 – £9,000 |
| General | ||
| Type (source) | Air-to-water1 | Air-to-water2 |
| Performance | ||
| Heating capacity (A7/W35) | – | 11.38 kW2 |
| Rated output 35 °C | 12.2 kW✓1 | 11 kW3 |
| Rated output 55 °C | 12 kW✓1 | 11 kW3 |
| Min. outdoor temperature | – | -22 °C2 |
| Efficiency | ||
| SCOP (35 °C) | 4.641 | 5.3✓3 |
| SCOP (55 °C) | 3.481 | 4.08✓3 |
| Seasonal efficiency ηs 35 °C | 183 %1 | 209 %✓3 |
| Seasonal efficiency ηs 55 °C | 136 %1 | 160 %✓3 |
| Energy label 35 °C | – | A+++3 |
| Energy label 55 °C | – | A+++3 |
| COP A7/W35 | 4.81 | 5✓2 |
| COP A2/W35 | 4.451 | – |
| COP A-7/W35 | 2.41 | – |
| SEER (cooling) | 2.781 | – |
| Noise | ||
| Outdoor unit sound power | 45 dB(A)✓1 | 55 dB(A)3 |
| Indoor unit sound power | 40 dB(A)1 | 35 dB(A)✓3 |
| Refrigerant | ||
| Refrigerant | R2901 | R2902 |
| Refrigerant GWP | – | 32 |
| Refrigerant charge | 1.6 kg1 | 1.15 kg✓2 |
| Electrical | ||
| Max. power input | 7.45 kW1 | – |
| Connectivity & smart | ||
| SG Ready | Yes1 | – |
Frequently asked questions
Which is better: the Bosch Compress CS6800iAW 12 ORM-T (AW 12 OR-T + CS6800iAW 12 M) or the NIBE S2125-20 3X400V?
SCOP (35 °C): Bosch Compress CS6800iAW 12 ORM-T (AW 12 OR-T + CS6800iAW 12 M) 4.64, NIBE S2125-20 3X400V 5.3. The NIBE S2125-20 3X400V is better on 7 of 10 comparable points.
What is the SCOP (35 °C) of the Bosch Compress CS6800iAW 12 ORM-T (AW 12 OR-T + CS6800iAW 12 M) and the NIBE S2125-20 3X400V?
Bosch Compress CS6800iAW 12 ORM-T (AW 12 OR-T + CS6800iAW 12 M): 4.64. NIBE S2125-20 3X400V: 5.3.
Which is better on refrigerant charge: the Bosch Compress CS6800iAW 12 ORM-T (AW 12 OR-T + CS6800iAW 12 M) or the NIBE S2125-20 3X400V?
NIBE S2125-20 3X400V: 1.15 kg. Bosch Compress CS6800iAW 12 ORM-T (AW 12 OR-T + CS6800iAW 12 M): 1.6 kg.
Which is better on outdoor unit sound power: the Bosch Compress CS6800iAW 12 ORM-T (AW 12 OR-T + CS6800iAW 12 M) or the NIBE S2125-20 3X400V?
Bosch Compress CS6800iAW 12 ORM-T (AW 12 OR-T + CS6800iAW 12 M): 45 dB(A). NIBE S2125-20 3X400V: 55 dB(A).
Related comparisons
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- BuderusLogatherm WLW176i-12 AR EvsNIBES2125-20 3X400V
- BoschCompress CS6800iAW 12 ORM-T (AW 12 OR-T + CS6800iAW 12 M)vsBuderusLogaplus M WLW176i-12 AR E (Logatherm WLW-12 MB AR + WLW176i-12 E)
- BoschCompress CS3800iAW 13 OE-T (CS3800iAW 13 O-T + AWEi)vsBuderusLogaplus M WLW176i-12 AR E (Logatherm WLW-12 MB AR + WLW176i-12 E)
- BoschCompress CS5800iAW 12 ORE-T (AW 12 OR-T + CS5800iAW 12 E)vsBuderusLogaplus M WLW166i-13 MBB AR E (WLW-13 MBB AR P3 & Logatherm WLW176i.2 E)
How we collect and check this data →
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
- European Product Registry for Energy Labelling (EPREL) – heat pumps — Europese Commissie · accessed 15 Oct 2026