STIEBEL ELTRON LWZ 8 CS Trend vs Viessmann IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.10-400-V001
SCOP (35 °C): STIEBEL ELTRON LWZ 8 CS Trend 4.14, Viessmann IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.10-400-V001 5.27. The Viessmann IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.10-400-V001 is better on 13 of 16 comparable points.
Who wins where
- STIEBEL ELTRON LWZ 8 CS Trend
- Viessmann IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.10-400-V001
Biggest differences
| Fact | LWZ 8 CS Trend | IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.10-400-V001 |
|---|---|---|
| Refrigerant GWP | 2,088 | 3 |
| Heating capacity (A7/W35) | 4.4 kW | 7.35 kW |
| Refrigerant charge | 2.95 kg | 2 kg |
| COP A2/W35 | 3.74 | 5.25 |
| COP A7/W35 | 4.74 | 6.63 |
| Rated output 55 °C | 7 kW | 9.37 kW |
Score per area = position (0–100) relative to all 1350 models in this category; higher is better.
| Technical specifications | STIEBEL ELTRONLWZ 8 CS Trend | ViessmannIDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.10-400-V001 |
|---|---|---|
| Grants & market | ||
| SEAI Heat Pump System Grant | €14,500 | €14,500 |
| General | ||
| Type (source) | Air-to-water 1 | Air-to-water 1 |
| Performance | ||
| Heating capacity (A7/W35) | 4.4 kW 2 | 7.35 kW ✓ 3 |
| Rated output 35 °C | 10 kW ✓ 1 | 9.8 kW 1 |
| Rated output 55 °C | 7 kW 1 | 9.37 kW ✓ 1 |
| Min. outdoor temperature | -20 °C 2 | -20 °C 3 |
| Efficiency | ||
| SCOP (35 °C) | 4.14 1 | 5.27 ✓ 1 |
| SCOP (55 °C) | 3.28 1 | 4.17 ✓ 1 |
| Seasonal efficiency ηs 35 °C | 163 % 1 | 208 % ✓ 1 |
| Seasonal efficiency ηs 55 °C | 128 % 1 | 164 % ✓ 1 |
| Energy label 35 °C | A, , 2 | A, , , 3 |
| Energy label 55 °C | A, , 2 | A, , , 3 |
| COP A7/W35 | 4.74 1 | 6.63 ✓ 1 |
| COP A2/W35 | 3.74 1 | 5.25 ✓ 1 |
| COP A-7/W35 | 2.61 1 | 3.44 ✓ 1 |
| Noise | ||
| Outdoor unit sound power | 55 dB(A) 1 | 49 dB(A) ✓ 1 |
| Indoor unit sound power | 50 dB(A) 1 | 40 dB(A) ✓ 1 |
| Refrigerant | ||
| Refrigerant | R410A 1 | R290 1 |
| Refrigerant GWP | 2,088 2 | 3 ✓ 3 |
| Refrigerant charge | 2.95 kg 1 | 2 kg ✓ 1 |
| Electrical | ||
| Max. power input | 5.3 kW 1 | 1.34 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