Inventor ATS08S/HU100S3 vs STIEBEL ELTRON WPL-A 07.2 W Plus HK 230
SCOP (35 °C): Inventor ATS08S/HU100S3 5.21, STIEBEL ELTRON WPL-A 07.2 W Plus HK 230 5.09. The STIEBEL ELTRON WPL-A 07.2 W Plus HK 230 is better on 8 of 15 comparable points.
Who wins where
- Inventor ATS08S/HU100S3
- STIEBEL ELTRON WPL-A 07.2 W Plus HK 230
Biggest differences
| Fact | ATS08S/HU100S3 | WPL-A 07.2 W Plus HK 230 |
|---|---|---|
| Refrigerant GWP | 675 | 3 |
| Heating capacity (A7/W35) | 8.3 kW | 3.05 kW |
| Outdoor unit sound power | 59 dB(A) | 43 dB(A) |
| Rated output 55 °C | 6.6 kW | 8.05 kW |
| Seasonal efficiency ηs 55 °C | 132 % | 158 % |
| SCOP (55 °C) | 3.38 | 4.03 |
Score per area = position (0–100) relative to all 1350 models in this category; higher is better.
| Technical specifications | InventorATS08S/HU100S3 | STIEBEL ELTRONWPL-A 07.2 W Plus HK 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) | 8.3 kW ✓ 2 | 3.05 kW 3 |
| Rated output 35 °C | 8.12 kW 1 | 8.15 kW ✓ 1 |
| Rated output 55 °C | 6.6 kW 1 | 8.05 kW ✓ 1 |
| Min. outdoor temperature | -22 °C 2 | -22 °C 3 |
| Efficiency | ||
| SCOP (35 °C) | 5.21 ✓ 1 | 5.09 1 |
| SCOP (55 °C) | 3.38 1 | 4.03 ✓ 1 |
| Seasonal efficiency ηs 35 °C | 205 % ✓ 1 | 200 % 1 |
| Seasonal efficiency ηs 55 °C | 132 % 1 | 158 % ✓ 1 |
| Energy label 35 °C | A, , , 2 | A, , , 3 |
| Energy label 55 °C | A, , 2 | A, , , 3 |
| COP A7/W35 | 5.2 1 | 5.5 ✓ 1 |
| COP A2/W35 | 5.09 ✓ 1 | 4.57 1 |
| COP A-7/W35 | 3.35 ✓ 1 | 3.25 1 |
| Noise | ||
| Outdoor unit sound power | 59 dB(A) 1 | 43 dB(A) ✓ 1 |
| Indoor unit sound power | 42 dB(A) 1 | – |
| Refrigerant | ||
| Refrigerant | R32 1 | R290 1 |
| Refrigerant GWP | 675 2 | 3 ✓ 3 |
| Refrigerant charge | 1.65 kg 1 | 1.6 kg ✓ 1 |
| Electrical | ||
| Max. power input | 1.63 kW 1 | 3.68 kW 1 |
| Connectivity & smart | ||
| SG Ready | Yes 1 | Yes 1 |
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
- Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed 29 Sept 2026