### How Does the "Magic" Work? A heat pump does not "create" heat — it transfers it. Even air at -10°C contains thermal energy. The refrigerant in the outdoor unit boils at very low temperatures, absorbs heat from outside air, is compressed by the compressor (at which point temperature rises sharply) and transfers this heat to the water in your heating system.
### Main System Components
**Evaporator:** The outdoor heat exchanger cooled by a fan.
**Compressor:** The "heart" of the system, which compresses the gas.
**Condenser:** The heat exchanger where refrigerant transfers heat to water.
**Expansion valve:** Reduces pressure to repeat the cycle.
### Why Choose "Air-to-Water"? This is the most popular type of pump due to ease of installation. No boreholes are needed (unlike geothermal systems) nor large land plots.
You get a 3-in-1 system: heating in winter, cooling in summer and hot water year-round. The most balanced solution in terms of price, installation speed and payback period for the Ukrainian consumer.