Axen KS-70W/EN7BP vs STIEBEL ELTRON LWZ 07.1 Premium HKL 230
SCOP (35 °C): Axen KS-70W/EN7BP 5.05, STIEBEL ELTRON LWZ 07.1 Premium HKL 230 4.2. The Axen KS-70W/EN7BP is better on 10 of 14 comparable points.
Who wins where
- Axen KS-70W/EN7BP
- STIEBEL ELTRON LWZ 07.1 Premium HKL 230
Biggest differences
| Fact | KS-70W/EN7BP | LWZ 07.1 Premium HKL 230 |
|---|---|---|
| Heating capacity (A7/W35) | 7 kW | 2.71 kW |
| Refrigerant charge | 0.83 kg | 1.24 kg |
| COP A2/W35 | 5.22 | 3.97 |
| Seasonal efficiency ηs 35 °C | 199 % | 165 % |
| SCOP (35 °C) | 5.05 | 4.2 |
| COP A-7/W35 | 3.25 | 2.71 |
Score per area = position (0–100) relative to all 1350 models in this category; higher is better.
| Technical specifications | AxenKS-70W/EN7BP | STIEBEL ELTRONLWZ 07.1 Premium HKL 230 |
|---|---|---|
| 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 kW ✓ 2 | 2.71 kW 3 |
| Rated output 35 °C | 7.2 kW 1 | 7.23 kW ✓ 1 |
| Rated output 55 °C | 6.8 kW 1 | 7.27 kW ✓ 1 |
| Efficiency | ||
| SCOP (35 °C) | 5.05 ✓ 1 | 4.2 1 |
| SCOP (55 °C) | 3.9 ✓ 1 | 3.28 1 |
| Seasonal efficiency ηs 35 °C | 199 % ✓ 1 | 165 % 1 |
| Seasonal efficiency ηs 55 °C | 153 % ✓ 1 | 128 % 1 |
| Energy label 35 °C | A, , , 2 | A, , 3 |
| Energy label 55 °C | A, , , 2 | A, , 3 |
| COP A7/W35 | 6.85 ✓ 1 | 5.77 1 |
| COP A2/W35 | 5.22 ✓ 1 | 3.97 1 |
| COP A-7/W35 | 3.25 ✓ 1 | 2.71 1 |
| Noise | ||
| Outdoor unit sound power | 54 dB(A) ✓ 1 | 56 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 | 0.83 kg ✓ 1 | 1.24 kg 1 |
| Electrical | ||
| Max. power input | 5.9 kW 1 | 12.55 kW 1 |
| Connectivity & smart | ||
| SG Ready | Yes 1 | Yes 1 |
| Grants & market | ||
| ISDE grant (NL) | – | 2,375 € 4 |
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
- ISDE heat pump notification code list — Rijksdienst voor Ondernemend Nederland (RVO) · accessed 28 Sept 2026