Bosch Compress CS3800iAW 10 OM-T (CS3800iAW O-T + AWMi) vs Buderus M WLW186i-10 AR T180
SCOP (35 °C): Bosch Compress CS3800iAW 10 OM-T (CS3800iAW O-T + AWMi) 5.01, Buderus M WLW186i-10 AR T180 4.73. The Bosch Compress CS3800iAW 10 OM-T (CS3800iAW O-T + AWMi) is better on 7 of 13 comparable points.
Who wins where
- Bosch Compress CS3800iAW 10 OM-T (CS3800iAW O-T + AWMi)
- Buderus M WLW186i-10 AR T180
Biggest differences
| Fact | Compress CS3800iAW 10 OM-T (CS3800iAW O-T + AWMi) | M WLW186i-10 AR T180 |
|---|---|---|
| SEER (cooling) | 4.46 | 2.7 |
| COP A-7/W35 | 3.19 | 2.5 |
| Refrigerant charge | 1.37 kg | 1.7 kg |
| Outdoor unit sound power | 49 dB(A) | 42 dB(A) |
| Seasonal efficiency ηs 55 °C | 154 % | 141 % |
| SCOP (55 °C) | 3.93 | 3.6 |
Score per area = position (0–100) relative to all 1350 models in this category; higher is better.
| Technical specifications | BoschCompress CS3800iAW 10 OM-T (CS3800iAW O-T + AWMi) | BuderusM WLW186i-10 AR T180 |
|---|---|---|
| Grants & market | ||
| Boiler Upgrade Scheme | £7,500 – £9,000 | £7,500 – £9,000 |
| General | ||
| Type (source) | Air-to-water 1 | Air-to-water 1 |
| Performance | ||
| Rated output 35 °C | 10 kW 1 | 10 kW 1 |
| Rated output 55 °C | 10 kW 1 | 10 kW 1 |
| Efficiency | ||
| SCOP (35 °C) | 5.01 ✓ 1 | 4.73 1 |
| SCOP (55 °C) | 3.93 ✓ 1 | 3.6 1 |
| Seasonal efficiency ηs 35 °C | 197 % ✓ 1 | 186 % 1 |
| Seasonal efficiency ηs 55 °C | 154 % ✓ 1 | 141 % 1 |
| COP A7/W35 | 4.73 1 | 4.8 ✓ 1 |
| COP A2/W35 | 3.82 1 | – |
| COP A-7/W35 | 3.19 ✓ 1 | 2.5 1 |
| SEER (cooling) | 4.46 ✓ 1 | 2.7 1 |
| Noise | ||
| Outdoor unit sound power | 49 dB(A) 1 | 42 dB(A) ✓ 1 |
| Indoor unit sound power | 40 dB(A) 1 | 40 dB(A) 1 |
| Refrigerant | ||
| Refrigerant | R290 1 | R290 1 |
| Refrigerant charge | 1.37 kg ✓ 1 | 1.7 kg 1 |
| Electrical | ||
| Max. power input | 4.7 kW 1 | 7.45 kW 1 |
| Connectivity & smart | ||
| SG Ready | Yes 1 | Yes 1 |
Sources
- List of eligible heat pumps (BEG) — Bundesamt für Wirtschaft und Ausfuhrkontrolle (BAFA) · accessed 27 Sept 2026