Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M) vs STIEBEL ELTRON WPL-A 07.2 Plus HK 230
SCOP (35 °C): Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M) 4.56, STIEBEL ELTRON WPL-A 07.2 Plus HK 230 5.08. The STIEBEL ELTRON WPL-A 07.2 Plus HK 230 is better on 9 of 12 comparable points.
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Both models in detail
Who wins where
- Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M)
- STIEBEL ELTRON WPL-A 07.2 Plus HK 230
Biggest differences
| Fact | Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M) | WPL-A 07.2 Plus HK 230 |
|---|---|---|
| Refrigerant charge | 0.95 kg | 1.4 kg |
| COP A-7/W35 | 2.35 | 3.25 |
| Rated output 35 °C | 6.6 kW | 8 kW |
| Rated output 55 °C | 6.6 kW | 8 kW |
| Seasonal efficiency ηs 55 °C | 136 % | 158 % |
| SCOP (55 °C) | 3.48 | 4.03 |
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) | STIEBEL ELTRONWPL-A 07.2 Plus HK 230 |
|---|---|---|
| Grants & market | ||
| Boiler Upgrade Scheme | £7,500 – £9,000 | £7,500 – £9,000 |
| General | ||
| Type (source) | Air-to-water1 | Air-to-water1 |
| Performance | ||
| Heating capacity (A7/W35) | – | 3.05 kW2 |
| Rated output 35 °C | 6.6 kW1 | 8 kW✓3 |
| Rated output 55 °C | 6.6 kW1 | 8 kW✓3 |
| Min. outdoor temperature | – | -22 °C2 |
| Efficiency | ||
| SCOP (35 °C) | 4.561 | 5.08✓3 |
| SCOP (55 °C) | 3.481 | 4.03✓3 |
| Seasonal efficiency ηs 35 °C | 179 %1 | 200 %✓3 |
| Seasonal efficiency ηs 55 °C | 136 %1 | 158 %✓3 |
| Energy label 35 °C | – | A+++3 |
| Energy label 55 °C | – | A+++3 |
| COP A7/W35 | 4.811 | 5.5✓1 |
| COP A2/W35 | 4.031 | 4.57✓1 |
| COP A-7/W35 | 2.351 | 3.25✓1 |
| SEER (cooling) | 2.561 | – |
| Noise | ||
| Outdoor unit sound power | 42 dB(A)✓1 | 43 dB(A)3 |
| Indoor unit sound power | 37 dB(A)1 | – |
| Refrigerant | ||
| Refrigerant | R2901 | R2901 |
| Refrigerant GWP | – | 32 |
| Refrigerant charge | 0.95 kg✓1 | 1.4 kg1 |
| Electrical | ||
| Max. power input | 3.15 kW1 | 3.68 kW1 |
| Connectivity & smart | ||
| SG Ready | Yes1 | Yes1 |
| Grants & market | ||
| ISDE grant (NL) | – | 2,800 €4 |
Frequently asked questions
Which is better: the Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M) or the STIEBEL ELTRON WPL-A 07.2 Plus HK 230?
SCOP (35 °C): Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M) 4.56, STIEBEL ELTRON WPL-A 07.2 Plus HK 230 5.08. The STIEBEL ELTRON WPL-A 07.2 Plus HK 230 is better on 9 of 12 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 STIEBEL ELTRON WPL-A 07.2 Plus HK 230?
Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M): 4.56. STIEBEL ELTRON WPL-A 07.2 Plus HK 230: 5.08.
Which is better on refrigerant charge: the Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M) or the STIEBEL ELTRON WPL-A 07.2 Plus HK 230?
Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M): 0.95 kg. STIEBEL ELTRON WPL-A 07.2 Plus HK 230: 1.4 kg.
Which is better on COP A-7/W35: the Bosch Compress CS6800iAW 7 ORM-S (AW 7 OR-S + CS6800iAW 12 M) or the STIEBEL ELTRON WPL-A 07.2 Plus HK 230?
STIEBEL ELTRON WPL-A 07.2 Plus HK 230: 3.25. 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 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
- ISDE heat pump notification code list — Rijksdienst voor Ondernemend Nederland (RVO) · accessed 28 Sept 2026