STIEBEL ELTRON LWZ 07.1 Premium HKL 230 vs Sunex NEXUS M9 Pro
SCOP (35 °C): STIEBEL ELTRON LWZ 07.1 Premium HKL 230 4.2, Sunex NEXUS M9 Pro 4.79. The Sunex NEXUS M9 Pro is better on 6 of 14 comparable points.
Who wins where
- STIEBEL ELTRON LWZ 07.1 Premium HKL 230
- Sunex NEXUS M9 Pro
Biggest differences
| Fact | LWZ 07.1 Premium HKL 230 | NEXUS M9 Pro |
|---|---|---|
| Refrigerant charge | 1.24 kg | 2.45 kg |
| COP A7/W35 | 5.77 | 4.47 |
| Seasonal efficiency ηs 35 °C | 165 % | 188.8 % |
| SCOP (35 °C) | 4.2 | 4.79 |
| Seasonal efficiency ηs 55 °C | 128 % | 141.6 % |
| SCOP (55 °C) | 3.28 | 3.62 |
Score per area = position (0–100) relative to all 1350 models in this category; higher is better.
| Technical specifications | STIEBEL ELTRONLWZ 07.1 Premium HKL 230 | SunexNEXUS M9 Pro |
|---|---|---|
| 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) | 2.71 kW 2 | – |
| Rated output 35 °C | 7.23 kW 1 | 7.52 kW ✓ 1 |
| Rated output 55 °C | 7.27 kW ✓ 1 | 7.1 kW 1 |
| Efficiency | ||
| SCOP (35 °C) | 4.2 1 | 4.79 ✓ 1 |
| SCOP (55 °C) | 3.28 1 | 3.62 ✓ 1 |
| Seasonal efficiency ηs 35 °C | 165 % 1 | 188.8 % ✓ 1 |
| Seasonal efficiency ηs 55 °C | 128 % 1 | 141.6 % ✓ 1 |
| Energy label 35 °C | A, , 2 | – |
| Energy label 55 °C | A, , 2 | – |
| COP A7/W35 | 5.77 ✓ 1 | 4.47 1 |
| COP A2/W35 | 3.97 ✓ 1 | 3.65 1 |
| COP A-7/W35 | 2.71 1 | 2.96 ✓ 1 |
| Noise | ||
| Outdoor unit sound power | 56 dB(A) ✓ 1 | 58 dB(A) 1 |
| Indoor unit sound power | 53 dB(A) 1 | – |
| Refrigerant | ||
| Refrigerant | R290 1 | R290 1 |
| Refrigerant GWP | 3 2 | 3 3 |
| Refrigerant charge | 1.24 kg ✓ 1 | 2.45 kg 1 |
| Electrical | ||
| Max. power input | 12.55 kW 1 | 4 kW 1 |
| Connectivity & smart | ||
| SG Ready | Yes 1 | Yes 1 |
| Grants & market | ||
| ISDE grant (NL) | 2,375 € 3 | 2,375 € 3 |
Sources
- List of eligible heat pumps (BEG) — Bundesamt für Wirtschaft und Ausfuhrkontrolle (BAFA) · accessed 28 Sept 2026
- Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed 29 Sept 2026
- ISDE heat pump notification code list — Rijksdienst voor Ondernemend Nederland (RVO) · accessed 28 Sept 2026