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ViessmannIDU-A Hybrid HWMIW.A1.19-V054 ODU 250-A AWMOF-251.A1.19-400-V002

The Viessmann IDU-A Hybrid HWMIW.A1.19-V054 ODU 250-A AWMOF-251.A1.19-400-V002 is an air-to-water heat pump with a SCOP of 4.86 (35 °C) and a sound power level of 48 dB(A).1

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SCOP (35 °C)
4.861

Seasonal efficiency: how much heat you get per kWh of electricity across a heating season.

Heating capacity (A7/W35)
9kW1
Official source
Outdoor unit sound power
48dB(A)1
Official source
Refrigerant
R2901
Official source
Type (source)
Air-to-water1
Official source

Technical specifications

General
Type (source) Air-to-water1
System Hybrid (with gas boiler)1
Performance
Heating capacity (A7/W35) 9 kW1
Rated output 35 °C 13.61 kW1
Rated output 55 °C 13.18 kW1
Min. outdoor temperature -20 °C1
Efficiency
SCOP (35 °C) 4.861
SCOP (55 °C) 3.891
Seasonal efficiency ηs 35 °C 191 %1
Seasonal efficiency ηs 55 °C 152 %1
Energy label 35 °C A, , , 1
Energy label 55 °C A, , , 1
COP A7/W35 5.271
Noise
Outdoor unit sound power 48 dB(A)1
Indoor unit sound power 40 dB(A)1
Refrigerant
Refrigerant R2901
Refrigerant GWP 31
Refrigerant charge 2 kg1

Manufacturer documentation

External links to Viessmann's official website. The manufacturer may change or move documents; where they differ, the manufacturer's latest version applies.

Frequently asked questions

Which refrigerant does the Viessmann IDU-A Hybrid HWMIW.A1.19-V054 ODU 250-A AWMOF-251.A1.19-400-V002 use?

The Viessmann IDU-A Hybrid HWMIW.A1.19-V054 ODU 250-A AWMOF-251.A1.19-400-V002 uses R290.1

Sources

  1. Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed 29 Sept 2026