Weishaupt WAB 14-A-RMD-A vs STIEBEL ELTRON LWZ 8 CS Trend
SCOP (35 °C): Weishaupt WAB 14-A-RMD-A 4.86, STIEBEL ELTRON LWZ 8 CS Trend 4.14. The Weishaupt WAB 14-A-RMD-A is better on 13 of 15 comparable points.
Who wins where
- Weishaupt WAB 14-A-RMD-A
- STIEBEL ELTRON LWZ 8 CS Trend
Biggest differences
| Fact | WAB 14-A-RMD-A | LWZ 8 CS Trend |
|---|---|---|
| Refrigerant GWP | 3 | 2,088 |
| Heating capacity (A7/W35) | 7.63 kW | 4.4 kW |
| Refrigerant charge | 1.8 kg | 2.95 kg |
| Rated output 55 °C | 9.6 kW | 7 kW |
| COP A2/W35 | 4.78 | 3.74 |
| Outdoor unit sound power | 46 dB(A) | 55 dB(A) |
Score per area = position (0–100) relative to all 1350 models in this category; higher is better.
| Technical specifications | WeishauptWAB 14-A-RMD-A | STIEBEL ELTRONLWZ 8 CS Trend |
|---|---|---|
| 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 | ||
| Heating capacity (A7/W35) | 7.63 kW ✓ 2 | 4.4 kW 3 |
| Rated output 35 °C | 10 kW 1 | 10 kW 1 |
| Rated output 55 °C | 9.6 kW ✓ 1 | 7 kW 1 |
| Min. outdoor temperature | – | -20 °C 3 |
| Efficiency | ||
| SCOP (35 °C) | 4.86 ✓ 1 | 4.14 1 |
| SCOP (55 °C) | 3.62 ✓ 1 | 3.28 1 |
| Seasonal efficiency ηs 35 °C | 191 % ✓ 1 | 163 % 1 |
| Seasonal efficiency ηs 55 °C | 142 % ✓ 1 | 128 % 1 |
| Energy label 35 °C | A, , , 2 | A, , 3 |
| Energy label 55 °C | A, , 2 | A, , 3 |
| COP A7/W35 | 5.11 ✓ 1 | 4.74 1 |
| COP A2/W35 | 4.78 ✓ 1 | 3.74 1 |
| COP A-7/W35 | 3.03 ✓ 1 | 2.61 1 |
| Noise | ||
| Outdoor unit sound power | 46 dB(A) ✓ 1 | 55 dB(A) 1 |
| Indoor unit sound power | 46 dB(A) ✓ 1 | 50 dB(A) 1 |
| Refrigerant | ||
| Refrigerant | R290 1 | R410A 1 |
| Refrigerant GWP | 3 ✓ 2 | 2,088 3 |
| Refrigerant charge | 1.8 kg ✓ 1 | 2.95 kg 1 |
| Electrical | ||
| Max. power input | 5.25 kW 1 | 5.3 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
- Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed 29 Sept 2026
- Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed 29 Sept 2026