Air source heat pumps

Air-water heat pumps are among the most widely used types of heating pumps. If homeowners decide to operate an air-source heat pump, they can make use of attractive government subsidies.

How an air source heat pump works

How the heat pump generates heat energy with air can be simply described with the example of a refrigerator. While the refrigerator conducts the warm air outside, the air-water heat pump brings the heat from the ambient air into the room. Specifically, a fan actively draws in the ambient air and transfers it to a heat exchanger (evaporator) installed in the heat pump. A refrigerant circulates in it, changing its physical state and evaporating even at low temperatures. To raise this refrigerant steam to a level that can be used for heating and hot water production, it is compressed using a compressor. 

Indoor or outdoor installation is possible

Air source heat pumps are among the most frequently used heat pumps. This is not only due to their relatively low investment costs, but also to their many installation options.

Air source heat pumps in monobloc design

In the monobloc version, all components important for heat recovery are located inside the heat pump. The connecting lines between the indoor and outdoor units are only filled with water, so such devices can be brought into operation quickly and easily. The specialist carrying out the work does not have to have a cooling certificate. And because most devices operate very quietly, installation close to the living area is possible.

Heat pump uses the heat from the air

Air source heat pump

Heat from the air

[1] Vitocal heat pump
[2] DHW
[3] Heating water buffer cylinder

Depending on the application, air source heat pumps can be used in a variety of ways. The Vitocal 350-A and Vitocal 300-A air-water heat pumps are particularly suitable for modernisation, whereas the Vitocal 200-A air-water heat pump is suitable for new construction. Compared to a brine-water heat pump, the investment in an air-water system is lower. Because the installation of a geothermal collector or the drilling work for the geothermal probe is completely eliminated. The heat pumps are designed for indoor and outdoor use. The installation outside the house is particularly space-saving. Only the control system and the hydraulic components are mounted on the wall in the house.

Particularly quiet in operation

Modern air-source heat pumps from Viessmann operate very quietly and are hardly audible during operation. This is the result of years of intensive research and development work. Viessmann heat pumps feature the Advanced Acoustic Design, in which all components of the heat pump are designed to minimise noise. Especially low-frequency noises, which are perceived as particularly disturbing, have been minimised.

A summary of the advantages of an air-water heat pump

The use of an air-source heat pump offers numerous advantages. Among the most important are:

  • Free heat source available at any time of day
  • Relatively low investment costs
  • Expandable thanks to cascade function
  • No official approval required
  • Suitable for both new build and modernisation
  • Retrofitting possible