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ViessmannVitocal 250-A AWO-E-AC 251.A16

Viessmann Vitocal 250-A AWO-E-AC 251.A16
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The Viessmann Vitocal 250-A AWO-E-AC 251.A16 is an air-to-water heat pump with a SCOP of 4.85 (35 °C) and a sound power level of 48 dB(A).1

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SCOP (35 °C)
4.851

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

Heating capacity (A7/W35)
8.5kW1
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
Performance
Heating capacity (A7/W35) 8.5 kW1
Rated output 35 °C 13.29 kW1
Rated output 55 °C 12.09 kW1
Min. outdoor temperature -20 °C1
Efficiency
SCOP (35 °C) 4.851
SCOP (55 °C) 3.921
Seasonal efficiency ηs 35 °C 190 %1
Seasonal efficiency ηs 55 °C 153 %1
Energy label 35 °C A, , , 1
Energy label 55 °C A, , , 1
COP A7/W35 5.311
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

Variants

This model is registered in 13 combinations (for example with a different indoor unit or cylinder) with exactly the same performance. All figures on this page apply to each of these types. The part of the type number that differs is in bold; small differences (e.g. cylinder volume or anode) are listed after it:

  • Vitocal 250-A AWO-E-AC 251.A16
  • IDU-A Compact 2C AWMIT.A1.19-V056 ODU 250-A AWMOF-251.A1.16-400-V002
  • IDU-A Compact AWMIT.A1.19-V053 ODU 250-A AWMOF-251.A1.16-400-V002
  • IDU-A Modular AWMIW.A1.19-V051 ODU 250-A AWMOF-251.A1.16-400-V002
  • Vitocal 250-A AWO-E-AC 251.A16 2C
  • Vitocal 250-A AWO-E-AC-AF 251.A16 2C
  • Vitocal 250-A AWO-E-AC-AF 251.A16
  • Vitocal 250-AH HAWO-AC 252.A16
  • Vitocal 250-AH HAWO-AC-AF 252.A16
  • Vitocal 252-A AWOT-E-AC 251.A16 2C
  • Vitocal 252-A AWOT-E-AC 251.A16
  • Vitocal 252-A AWOT-E-AC-AF 251.A16 2C
  • Vitocal 252-A AWOT-E-AC-AF 251.A16

Manufacturer documentation

  • Datasheet / specifications — VITOCAL 250-A Luft/Wasser-Wärmepumpen mit Innen- und Außeneinheit – Datenblatt (4/2025) (viessmann.de, PDF)

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 Vitocal 250-A AWO-E-AC 251.A16 use?

The Viessmann Vitocal 250-A AWO-E-AC 251.A16 uses R290.1

Sources

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