Air/water heat pump

by: Mirjam Visser, 2011-01-21 01:42:00 UTC
Sustainability Aspects: Upto 3.7 times the heat/cold output to the energy you put in.

Heat exchanger

The new Vitocal 300-A is the first air/water heat pump with Digital Scroll Technology and electronic bi-flow expansion valve. This enables high annual performance factors up to 3.7 (to EN 14511) to be achieved, resulting in a significant reduction in operating costs.

The permanent monitoring with the new RCD system (Refrigerant Cycle Diagnostic) continually ensures that the output perfectly matches the actual demand and that the operation is optimised. Subject to system implementation, expensive buffer or primary systems can be saved, and investment outlay can be reduced.

Operating noise is low, ensured by radial fans with speed regulation and a reduced fan speed for night operation.

Benefits at a glance:

  • Low CO2 emissions through high COP (COP = Coefficient of Performance) to EN 14511
  • Highest efficiency at every operating point and low consumption costs
  • Low operating noise through radial fan and reduced fan speed during night operation
  • Efficient defrosting through circuit reversal


  • Variable output selection from 3 to 9 kW
  • Coefficient of Performance (air 2 °C / water 35 °C): Up to 3.7 to EN 14511 (5 K spread)
  • Maximum flow temperature: 60 °C (at 0 °C outside temperature)

Achieved a Red Dot Design award 2010

Designer: Viessmann
Manufacturer: Viessmann
Category: Energy efficient heating


Heat exchanger
Heat exchanger
picture Red dot

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