Buderus Logatherm WLW176i-12 AR E vs NIBE S2125-20 3X400V
SCOP (35 °C): Buderus Logatherm WLW176i-12 AR E 4.66, NIBE S2125-20 3X400V 5.3. The NIBE S2125-20 3X400V is better on 7 of 13 comparable points.
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Both models in detail
Who wins where
- Buderus Logatherm WLW176i-12 AR E
- NIBE S2125-20 3X400V
Biggest differences
| Fact | Logatherm WLW176i-12 AR E | S2125-20 3X400V |
|---|---|---|
| Heating capacity (A7/W35) | 5.58 kW | 11.38 kW |
| Refrigerant charge | 1.7 kg | 1.15 kg |
| Outdoor unit sound power | 45 dB(A) | 55 dB(A) |
| Seasonal efficiency ηs 55 °C | 137 % | 160 % |
| SCOP (55 °C) | 3.51 | 4.08 |
| SCOP (35 °C) | 4.66 | 5.3 |
Score per area = position (0–100) relative to all 1350 models in this category; higher is better.
| Technical specifications | BuderusLogatherm WLW176i-12 AR E | NIBES2125-20 3X400V |
|---|---|---|
| General | ||
| Type (source) | Air-to-water1 | Air-to-water2 |
| Performance | ||
| Heating capacity (A7/W35) | 5.58 kW1 | 11.38 kW✓2 |
| Rated output 35 °C | 12.2 kW✓1 | 11 kW3 |
| Rated output 55 °C | 12 kW✓1 | 11 kW3 |
| Min. outdoor temperature | -22 °C1 | -22 °C2 |
| Efficiency | ||
| SCOP (35 °C) | 4.661 | 5.3✓3 |
| SCOP (55 °C) | 3.511 | 4.08✓3 |
| Seasonal efficiency ηs 35 °C | 184 %1 | 209 %✓3 |
| Seasonal efficiency ηs 55 °C | 137 %1 | 160 %✓3 |
| Energy label 35 °C | A+++1 | A+++3 |
| Energy label 55 °C | A++1 | A+++3 |
| COP A7/W35 | 4.841 | 5✓2 |
| Noise | ||
| Outdoor unit sound power | 45 dB(A)✓1 | 55 dB(A)3 |
| Indoor unit sound power | 31 dB(A)✓1 | 35 dB(A)3 |
| Refrigerant | ||
| Refrigerant | R2901 | R2902 |
| Refrigerant GWP | 31 | 32 |
| Refrigerant charge | 1.7 kg1 | 1.15 kg✓2 |
Frequently asked questions
Which is better: the Buderus Logatherm WLW176i-12 AR E or the NIBE S2125-20 3X400V?
SCOP (35 °C): Buderus Logatherm WLW176i-12 AR E 4.66, NIBE S2125-20 3X400V 5.3. The NIBE S2125-20 3X400V is better on 7 of 13 comparable points.
What is the SCOP (35 °C) of the Buderus Logatherm WLW176i-12 AR E and the NIBE S2125-20 3X400V?
Buderus Logatherm WLW176i-12 AR E: 4.66. NIBE S2125-20 3X400V: 5.3.
Which is better on heating capacity (A7/W35): the Buderus Logatherm WLW176i-12 AR E or the NIBE S2125-20 3X400V?
NIBE S2125-20 3X400V: 11.38 kW. Buderus Logatherm WLW176i-12 AR E: 5.58 kW.
Which is better on refrigerant charge: the Buderus Logatherm WLW176i-12 AR E or the NIBE S2125-20 3X400V?
NIBE S2125-20 3X400V: 1.15 kg. Buderus Logatherm WLW176i-12 AR E: 1.7 kg.
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- BoschCompress CS6800iAW 12 ORM-T (AW 12 OR-T + CS6800iAW 12 M)vsNIBES2125-20 3X400V
- BoschCompress CS3800iAW 13 OE-T (CS3800iAW 13 O-T + AWEi)vsBuderusLogaplus M WLW176i-12 AR E (Logatherm WLW-12 MB AR + WLW176i-12 E)
- BoschCompress CS5800iAW 12 ORE-T (AW 12 OR-T + CS5800iAW 12 E)vsBuderusLogaplus M WLW166i-13 MBB AR E (WLW-13 MBB AR P3 & Logatherm WLW176i.2 E)
- BoschCompress CS5800iAW 12 ORE-T (AW 12 OR-T + CS5800iAW 12 E)vsBuderusLogaplus M WLW176i-12 AR E (Logatherm WLW-12 MB AR + WLW176i-12 E)
How we collect and check this data →
Sources
- Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed Sep 29, 2026
- Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed Sep 29, 2026
- European Product Registry for Energy Labelling (EPREL) – heat pumps — Europese Commissie · accessed Oct 15, 2026