Buderus Logatherm WLW176i-7 AR E vs Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001
SCOP (35 °C): Buderus Logatherm WLW176i-7 AR E 4.58, Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001 4.44. The Buderus Logatherm WLW176i-7 AR E is better on 8 of 13 comparable points.
Both models in detail
Who wins where
- Buderus Logatherm WLW176i-7 AR E
- Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001
Biggest differences
| Fact | Logatherm WLW176i-7 AR E | Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001 |
|---|---|---|
| Heating capacity (A7/W35) | 2.84 kW | 5.6 kW |
| Indoor unit sound power | 31 dB(A) | 40 dB(A) |
| COP A7/W35 | 4.85 | 6.2 |
| Refrigerant charge | 0.95 kg | 1.2 kg |
| Outdoor unit sound power | 42 dB(A) | 48 dB(A) |
| Min. outdoor temperature | -22 °C | -20 °C |
Score per area = position (0–100) relative to all 1350 models in this category; higher is better.
| Technical specifications | BuderusLogatherm WLW176i-7 AR E | ViessmannVitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001 |
|---|---|---|
| Grants & market | ||
| SEAI Heat Pump System Grant | €14,500 | €14,500 |
| General | ||
| Type (source) | Air-to-water1 | Air-to-water2 |
| Performance | ||
| Heating capacity (A7/W35) | 2.84 kW1 | 5.6 kW✓3 |
| Rated output 35 °C | 6.6 kW✓1 | 6.47 kW2 |
| Rated output 55 °C | 6.6 kW✓1 | 6.17 kW2 |
| Min. outdoor temperature | -22 °C✓1 | -20 °C3 |
| Efficiency | ||
| SCOP (35 °C) | 4.58✓1 | 4.442 |
| SCOP (55 °C) | 3.521 | 3.58✓2 |
| Seasonal efficiency ηs 35 °C | 180 %✓1 | 176 %2 |
| Seasonal efficiency ηs 55 °C | 138 %1 | 140 %✓2 |
| Energy label 35 °C | A+++1 | A+++3 |
| Energy label 55 °C | A++1 | A++3 |
| COP A7/W35 | 4.851 | 6.2✓2 |
| COP A2/W35 | – | 4.22 |
| COP A-7/W35 | – | 32 |
| Noise | ||
| Outdoor unit sound power | 42 dB(A)✓1 | 48 dB(A)2 |
| Indoor unit sound power | 31 dB(A)✓1 | 40 dB(A)2 |
| Refrigerant | ||
| Refrigerant | R2901 | R2902 |
| Refrigerant GWP | 31 | 33 |
| Refrigerant charge | 0.95 kg✓1 | 1.2 kg2 |
| Electrical | ||
| Max. power input | – | 1.14 kW2 |
| Connectivity & smart | ||
| SG Ready | – | Yes2 |
Frequently asked questions
Which is better: the Buderus Logatherm WLW176i-7 AR E or the Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001?
SCOP (35 °C): Buderus Logatherm WLW176i-7 AR E 4.58, Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001 4.44. The Buderus Logatherm WLW176i-7 AR E is better on 8 of 13 comparable points.
What is the SCOP (35 °C) of the Buderus Logatherm WLW176i-7 AR E and the Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001?
Buderus Logatherm WLW176i-7 AR E: 4.58. Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001: 4.44.
Which is better on heating capacity (A7/W35): the Buderus Logatherm WLW176i-7 AR E or the Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001?
Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001: 5.6 kW. Buderus Logatherm WLW176i-7 AR E: 2.84 kW.
Which is better on indoor unit sound power: the Buderus Logatherm WLW176i-7 AR E or the Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001?
Buderus Logatherm WLW176i-7 AR E: 31 dB(A). Viessmann Vitocal 250-A IDU-A AWMIW.A1.19-V052 / ODU 250-A AWMOF-251.A1.08-230-V001: 40 dB(A).
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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