How it works

The ZEWOTHERM heat pumps are air-to-water heat pumps which extract their energy from the outside air. In combination with a low-energy system (surface heating via floor, wall or ceiling), they work particularly efficiently and save costs. The technology is clean and above all natural. With no soot, smoke, dust or local combustion, the heat pump provides emission-free heat to feel good in the most important place in the world - your own home.

The way a heat pump works is comparable to that of a refrigerator. Whereas refrigerators extract heat from food and release this heat back into the room via the back of the refrigerator, a heat pump works in exactly the opposite way: it takes the freely available thermal energy from the almost inexhaustible outside air and brings it up to a temperature level that is required to heat a house (heating and domestic hot water).

The ZEWOTHERM heat pumps consist of an outdoor and indoor unit, which are connected to each other via cooling pipes. The outdoor unit draws in the outside air via a fan and conducts it through an evaporator. In the process, the heat is extracted from the outside air. The energy thus gained is then transferred to the heating water in the indoor unit and used for heating purposes.


The refrigerant circuit

The refrigerant circuit is divided into four main components so that the energy extracted from the outside air can be transported to the internal unit of the heat pump.

  1. Evaporator: The heat energy contained in the outside air causes the R 410A refrigerant circulating in the heat pump (environmentally friendly), which has a very low boiling point, to evaporate.
  2. Compressor: The electrically operated compressor brings the evaporated and thus gaseous refrigerant to a high pressure. This results in a considerable increase in the temperature of the refrigerant.
  3. Condenser: The heat energy - now at a high temperature level - is transferred to the heating water. The gaseous refrigerant changes its aggregate state back to liquid.
  4. Expansion valve: In the expansion valve, the pressure of the refrigerant is reduced and thus returns to its original values in temperature and pressure.