Bosch Compress CS5800iAW 4 ORMB-S (AW 4 OR-S + CS5800iAW 12 MB) vs Buderus M WLW186i-4 AR E (W)
SCOP (35 °C): Bosch Compress CS5800iAW 4 ORMB-S (AW 4 OR-S + CS5800iAW 12 MB) 4.55, Buderus M WLW186i-4 AR E (W) 4.58. The Buderus M WLW186i-4 AR E (W) is better on 8 of 14 comparable points.
Both models in detail
Who wins where
- Bosch Compress CS5800iAW 4 ORMB-S (AW 4 OR-S + CS5800iAW 12 MB)
- Buderus M WLW186i-4 AR E (W)
Biggest differences
| Fact | Compress CS5800iAW 4 ORMB-S (AW 4 OR-S + CS5800iAW 12 MB) | M WLW186i-4 AR E (W) |
|---|---|---|
| Indoor unit sound power | 37 dB(A) | 31 dB(A) |
Score per area = position (0–100) relative to all 1350 models in this category; higher is better.
| Technical specifications | BoschCompress CS5800iAW 4 ORMB-S (AW 4 OR-S + CS5800iAW 12 MB) | BuderusM WLW186i-4 AR E (W) |
|---|---|---|
| Grants & market | ||
| Boiler Upgrade Scheme | £7,500 – £9,000 | £7,500 – £9,000 |
| General | ||
| Type (source) | Air-to-water1 | Air-to-water1 |
| Performance | ||
| Rated output 35 °C | 4.4 kW1 | 4.4 kW1 |
| Rated output 55 °C | 4 kW1 | 4 kW1 |
| Efficiency | ||
| SCOP (35 °C) | 4.551 | 4.58✓1 |
| SCOP (55 °C) | 3.281 | 3.33✓1 |
| Seasonal efficiency ηs 35 °C | 179 %1 | 180 %✓1 |
| Seasonal efficiency ηs 55 °C | 128 %1 | 130 %✓1 |
| COP A7/W35 | 4.821 | 4.85✓1 |
| COP A2/W35 | 3.911 | 3.94✓1 |
| COP A-7/W35 | 2.881 | 2.9✓1 |
| SEER (cooling) | 2.361 | 2.361 |
| Noise | ||
| Outdoor unit sound power | 40 dB(A)1 | 40 dB(A)1 |
| Indoor unit sound power | 37 dB(A)1 | 31 dB(A)✓1 |
| Refrigerant | ||
| Refrigerant | R2901 | R2901 |
| Refrigerant charge | 0.95 kg1 | 0.95 kg1 |
| Electrical | ||
| Max. power input | 3.2 kW1 | 3.2 kW1 |
| Connectivity & smart | ||
| SG Ready | Yes1 | Yes1 |
Frequently asked questions
Which is better: the Bosch Compress CS5800iAW 4 ORMB-S (AW 4 OR-S + CS5800iAW 12 MB) or the Buderus M WLW186i-4 AR E (W)?
SCOP (35 °C): Bosch Compress CS5800iAW 4 ORMB-S (AW 4 OR-S + CS5800iAW 12 MB) 4.55, Buderus M WLW186i-4 AR E (W) 4.58. The Buderus M WLW186i-4 AR E (W) is better on 8 of 14 comparable points.
What is the SCOP (35 °C) of the Bosch Compress CS5800iAW 4 ORMB-S (AW 4 OR-S + CS5800iAW 12 MB) and the Buderus M WLW186i-4 AR E (W)?
Bosch Compress CS5800iAW 4 ORMB-S (AW 4 OR-S + CS5800iAW 12 MB): 4.55. Buderus M WLW186i-4 AR E (W): 4.58.
Which is better on indoor unit sound power: the Bosch Compress CS5800iAW 4 ORMB-S (AW 4 OR-S + CS5800iAW 12 MB) or the Buderus M WLW186i-4 AR E (W)?
Buderus M WLW186i-4 AR E (W): 31 dB(A). Bosch Compress CS5800iAW 4 ORMB-S (AW 4 OR-S + CS5800iAW 12 MB): 37 dB(A).
Which is better on seasonal efficiency ηs 55 °C: the Bosch Compress CS5800iAW 4 ORMB-S (AW 4 OR-S + CS5800iAW 12 MB) or the Buderus M WLW186i-4 AR E (W)?
Buderus M WLW186i-4 AR E (W): 130 %. Bosch Compress CS5800iAW 4 ORMB-S (AW 4 OR-S + CS5800iAW 12 MB): 128 %.
Related comparisons
- BoschCompress CS5800iAW 4 ORMB-S (AW 4 OR-S + CS5800iAW 12 MB)vsPanasonicAquarea [WH-ADC0509L3E5AN / WH-WDG05LE5]
- BoschCompress CS5800iAW 4 ORMB-S (AW 4 OR-S + CS5800iAW 12 MB)vsPanasonicAquarea [WH-SDC0509L3E5 / WH-WDG05LE5]
- BoschCompress CS5800iAW 4 ORMB-S (AW 4 OR-S + CS5800iAW 12 MB)vsBuderusLogaplus M WLW176i-4 AR E (Logatherm WLW-4 MB AR + WLW176i-12 E)
- BoschCompress CS5800iAW 4 ORMB-S (AW 4 OR-S + CS5800iAW 12 MB)vsBuderusM WLW186i-4 AR T180 W
- BoschCompress CS6800iAW 4 ORMB-S (AW 4 OR-S + CS6800iAW 12 MB)vsBuderusLogaplus M WLW176i-4 AR E (Logatherm WLW-4 MB AR + WLW176i-12 E)
- BuderusLogaplus M WLW166i-4 MBB AR E (WLW-4 MBB AR & Logatherm WLW176i.2 E)vsPanasonicAquarea [WH-SDC0309K3E5 / WH-UDZ03KE5]
How we collect and check this data →
Sources
- List of eligible heat pumps (BEG) — Bundesamt für Wirtschaft und Ausfuhrkontrolle (BAFA) · accessed 27 Sept 2026