NIBE S2125-20 3X400V vs STIEBEL ELTRON WPL-A 10.2 Plus HK 400
SCOP (35 °C): NIBE S2125-20 3X400V 5.3, STIEBEL ELTRON WPL-A 10.2 Plus HK 400 4.95. The NIBE S2125-20 3X400V is better on 6 of 12 comparable points.
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Both models in detail
Who wins where
- NIBE S2125-20 3X400V
- STIEBEL ELTRON WPL-A 10.2 Plus HK 400
Biggest differences
| Fact | S2125-20 3X400V | WPL-A 10.2 Plus HK 400 |
|---|---|---|
| Heating capacity (A7/W35) | 11.38 kW | 4.32 kW |
| Refrigerant charge | 1.15 kg | 1.6 kg |
| Outdoor unit sound power | 55 dB(A) | 46 dB(A) |
| Rated output 35 °C | 11 kW | 12 kW |
| Rated output 55 °C | 11 kW | 12 kW |
| COP A7/W35 | 5 | 5.4 |
Score per area = position (0–100) relative to all 1350 models in this category; higher is better.
| Technical specifications | NIBES2125-20 3X400V | STIEBEL ELTRONWPL-A 10.2 Plus HK 400 |
|---|---|---|
| General | ||
| Type (source) | Air-to-water1 | Air-to-water2 |
| Performance | ||
| Heating capacity (A7/W35) | 11.38 kW✓1 | 4.32 kW3 |
| Rated output 35 °C | 11 kW4 | 12 kW✓5 |
| Rated output 55 °C | 11 kW4 | 12 kW✓5 |
| Min. outdoor temperature | -22 °C1 | -22 °C3 |
| Efficiency | ||
| SCOP (35 °C) | 5.3✓4 | 4.955 |
| SCOP (55 °C) | 4.08✓4 | 45 |
| Seasonal efficiency ηs 35 °C | 209 %✓4 | 195 %5 |
| Seasonal efficiency ηs 55 °C | 160 %✓4 | 157 %5 |
| Energy label 35 °C | A+++4 | A+++5 |
| Energy label 55 °C | A+++4 | A+++5 |
| COP A7/W35 | 51 | 5.4✓2 |
| COP A2/W35 | – | 4.542 |
| COP A-7/W35 | – | 3.152 |
| Noise | ||
| Outdoor unit sound power | 55 dB(A)4 | 46 dB(A)✓5 |
| Indoor unit sound power | 35 dB(A)4 | – |
| Refrigerant | ||
| Refrigerant | R2901 | R2902 |
| Refrigerant GWP | 31 | 33 |
| Refrigerant charge | 1.15 kg✓1 | 1.6 kg2 |
| Electrical | ||
| Max. power input | – | 6.83 kW2 |
| Connectivity & smart | ||
| SG Ready | – | Yes2 |
| Grants & market | ||
| ISDE grant (NL) | – | 3,475 €6 |
Frequently asked questions
Which is better: the NIBE S2125-20 3X400V or the STIEBEL ELTRON WPL-A 10.2 Plus HK 400?
SCOP (35 °C): NIBE S2125-20 3X400V 5.3, STIEBEL ELTRON WPL-A 10.2 Plus HK 400 4.95. The NIBE S2125-20 3X400V is better on 6 of 12 comparable points.
What is the SCOP (35 °C) of the NIBE S2125-20 3X400V and the STIEBEL ELTRON WPL-A 10.2 Plus HK 400?
NIBE S2125-20 3X400V: 5.3. STIEBEL ELTRON WPL-A 10.2 Plus HK 400: 4.95.
Which is better on heating capacity (A7/W35): the NIBE S2125-20 3X400V or the STIEBEL ELTRON WPL-A 10.2 Plus HK 400?
NIBE S2125-20 3X400V: 11.38 kW. STIEBEL ELTRON WPL-A 10.2 Plus HK 400: 4.32 kW.
Which is better on refrigerant charge: the NIBE S2125-20 3X400V or the STIEBEL ELTRON WPL-A 10.2 Plus HK 400?
NIBE S2125-20 3X400V: 1.15 kg. STIEBEL ELTRON WPL-A 10.2 Plus HK 400: 1.6 kg.
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How we collect and check this data →
Sources
- Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed 29 Sept 2026
- 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
- European Product Registry for Energy Labelling (EPREL) – heat pumps — Europese Commissie · accessed 15 Oct 2026
- European Product Registry for Energy Labelling (EPREL) – heat pumps — Europese Commissie · accessed 15 Oct 2026
- ISDE heat pump notification code list — Rijksdienst voor Ondernemend Nederland (RVO) · accessed 28 Sept 2026