August Brötje BLW Eco-KP 9.2 vs Bosch Compress CS3800iAW 7 OE-S (CS3800iAW 7 O-S + AWEi)
SCOP (35 °C): August Brötje BLW Eco-KP 9.2 5.2, Bosch Compress CS3800iAW 7 OE-S (CS3800iAW 7 O-S + AWEi) 4.96. The August Brötje BLW Eco-KP 9.2 is better on 7 of 13 comparable points.
Who wins where
- August Brötje BLW Eco-KP 9.2
- Bosch Compress CS3800iAW 7 OE-S (CS3800iAW 7 O-S + AWEi)
Biggest differences
| Fact | BLW Eco-KP 9.2 | Compress CS3800iAW 7 OE-S (CS3800iAW 7 O-S + AWEi) |
|---|---|---|
| COP A2/W35 | 3.6 | 4.19 |
| COP A7/W35 | 4.98 | 4.41 |
| Indoor unit sound power | 31.7 dB(A) | 34 dB(A) |
| Seasonal efficiency ηs 55 °C | 153 % | 144 % |
| SCOP (55 °C) | 3.9 | 3.68 |
| COP A-7/W35 | 2.9 | 3.05 |
Score per area = position (0–100) relative to all 1000 models in this category; higher is better.
| Technical specifications | August BrötjeBLW Eco-KP 9.2 | BoschCompress CS3800iAW 7 OE-S (CS3800iAW 7 O-S + AWEi) |
|---|---|---|
| Grants & market | ||
| Boiler Upgrade Scheme | £7,500 – £9,000 | £7,500 – £9,000 |
| Performance | ||
| Rated output 35 °C | 8 kW 1 | 8 kW 1 |
| Rated output 55 °C | 7.8 kW 1 | 8 kW ✓ 1 |
| Efficiency | ||
| SCOP (35 °C) | 5.2 ✓ 1 | 4.96 1 |
| SCOP (55 °C) | 3.9 ✓ 1 | 3.68 1 |
| Seasonal efficiency ηs 35 °C | 205 % ✓ 1 | 195 % 1 |
| Seasonal efficiency ηs 55 °C | 153 % ✓ 1 | 144 % 1 |
| COP A7/W35 | 4.98 ✓ 1 | 4.41 1 |
| COP A2/W35 | 3.6 1 | 4.19 ✓ 1 |
| COP A-7/W35 | 2.9 1 | 3.05 ✓ 1 |
| Noise | ||
| Outdoor unit sound power | 49 dB(A) 1 | 48 dB(A) ✓ 1 |
| Indoor unit sound power | 31.7 dB(A) ✓ 1 | 34 dB(A) 1 |
| Refrigerant | ||
| Refrigerant | R290 1 | R290 1 |
| Refrigerant charge | 1.1 kg ✓ 1 | 1.13 kg 1 |
| Electrical | ||
| Max. power input | 3.9 kW 1 | 3.4 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