Bosch Compress CS3800iAW 4 OE-S (CS3800iAW 4 O-S + AWEi) vs Bosch Home Comfort Cooling and Heating airH2O 800 H (2HP) RASM-2VTW2E+HWM-W2E(-B)
SCOP (35 °C): Bosch Compress CS3800iAW 4 OE-S (CS3800iAW 4 O-S + AWEi) 4.99, Bosch Home Comfort Cooling and Heating airH2O 800 H (2HP) RASM-2VTW2E+HWM-W2E(-B) 4.5. The Bosch Compress CS3800iAW 4 OE-S (CS3800iAW 4 O-S + AWEi) is better on 8 of 13 comparable points.
Who wins where
- Bosch Compress CS3800iAW 4 OE-S (CS3800iAW 4 O-S + AWEi)
- Bosch Home Comfort Cooling and Heating airH2O 800 H (2HP) RASM-2VTW2E+HWM-W2E(-B)
Biggest differences
| Fact | Compress CS3800iAW 4 OE-S (CS3800iAW 4 O-S + AWEi) | airH2O 800 H (2HP) RASM-2VTW2E+HWM-W2E(-B) |
|---|---|---|
| COP A7/W35 | 4.99 | 6.89 |
| Refrigerant charge | 1.13 kg | 0.9 kg |
| COP A-7/W35 | 3.22 | 2.64 |
| Indoor unit sound power | 34 dB(A) | 41 dB(A) |
| Outdoor unit sound power | 48 dB(A) | 55 dB(A) |
| Seasonal efficiency ηs 55 °C | 141 % | 127 % |
Score per area = position (0–100) relative to all 1000 models in this category; higher is better.
| Technical specifications | BoschCompress CS3800iAW 4 OE-S (CS3800iAW 4 O-S + AWEi) | Bosch Home Comfort Cooling and HeatingairH2O 800 H (2HP) RASM-2VTW2E+HWM-W2E(-B) |
|---|---|---|
| Grants & market | ||
| Boiler Upgrade Scheme | £7,500 – £9,000 | £7,500 – £9,000 |
| Performance | ||
| Rated output 35 °C | 4 kW 1 | 4 kW 1 |
| Rated output 55 °C | 4 kW 1 | 4 kW 1 |
| Efficiency | ||
| SCOP (35 °C) | 4.99 ✓ 1 | 4.5 1 |
| SCOP (55 °C) | 3.6 ✓ 1 | 3.25 1 |
| Seasonal efficiency ηs 35 °C | 196 % ✓ 1 | 177 % 1 |
| Seasonal efficiency ηs 55 °C | 141 % ✓ 1 | 127 % 1 |
| COP A7/W35 | 4.99 1 | 6.89 ✓ 1 |
| COP A2/W35 | 5 ✓ 1 | 4.66 1 |
| COP A-7/W35 | 3.22 ✓ 1 | 2.64 1 |
| Noise | ||
| Outdoor unit sound power | 48 dB(A) ✓ 1 | 55 dB(A) 1 |
| Indoor unit sound power | 34 dB(A) ✓ 1 | 41 dB(A) 1 |
| Refrigerant | ||
| Refrigerant | R290 1 | R290 1 |
| Refrigerant charge | 1.13 kg 1 | 0.9 kg ✓ 1 |
| Electrical | ||
| Max. power input | 1.9 kW 1 | 2.88 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