ELCO AEROTOP SX13 vs STIEBEL ELTRON WPL-A 13.2 Trend HK 400
SCOP (35 °C): ELCO AEROTOP SX13 4.76, STIEBEL ELTRON WPL-A 13.2 Trend HK 400 4.65. The STIEBEL ELTRON WPL-A 13.2 Trend HK 400 is better on 7 of 12 comparable points.
Who wins where
- ELCO AEROTOP SX13
- STIEBEL ELTRON WPL-A 13.2 Trend HK 400
Biggest differences
| Fact | AEROTOP SX13 | WPL-A 13.2 Trend HK 400 |
|---|---|---|
| Refrigerant GWP | 675 | 3 |
| COP A7/W35 | 3.15 | 5.36 |
| Refrigerant charge | 2.6 kg | 1.6 kg |
| Min. outdoor temperature | -20 °C | -22 °C |
| Rated output 55 °C | 13.53 kW | 14.09 kW |
| Outdoor unit sound power | 51 dB(A) | 49 dB(A) |
Score per area = position (0–100) relative to all 1350 models in this category; higher is better.
| Technical specifications | ELCOAEROTOP SX13 | STIEBEL ELTRONWPL-A 13.2 Trend HK 400 |
|---|---|---|
| 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) | – | 5.56 kW 2 |
| Rated output 35 °C | 14.18 kW 1 | 14.25 kW ✓ 1 |
| Rated output 55 °C | 13.53 kW 1 | 14.09 kW ✓ 1 |
| Min. outdoor temperature | -20 °C 3 | -22 °C ✓ 2 |
| Efficiency | ||
| SCOP (35 °C) | 4.76 ✓ 1 | 4.65 1 |
| SCOP (55 °C) | 3.85 1 | 3.85 1 |
| Seasonal efficiency ηs 35 °C | 187 % ✓ 1 | 183 % 1 |
| Seasonal efficiency ηs 55 °C | 151 % 1 | 151 % 1 |
| Energy label 35 °C | A, , , 3 | A, , , 2 |
| Energy label 55 °C | A, , , 3 | A, , , 2 |
| COP A7/W35 | 3.15 1 | 5.36 ✓ 1 |
| COP A2/W35 | – | 3.91 1 |
| COP A-7/W35 | – | 2.75 1 |
| Noise | ||
| Outdoor unit sound power | 51 dB(A) 1 | 49 dB(A) ✓ 1 |
| Refrigerant | ||
| Refrigerant | R32 1 | R290 1 |
| Refrigerant GWP | 675 3 | 3 ✓ 2 |
| Refrigerant charge | 2.6 kg 1 | 1.6 kg ✓ 1 |
| Electrical | ||
| Max. power input | 6.7 kW 1 | 7.65 kW 1 |
| Connectivity & smart | ||
| SG Ready | Yes 1 | Yes 1 |
| Grants & market | ||
| ISDE grant (NL) | – | 4,150 € 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