Feature:
It absorbs heat energy from low temperature reserve, and release the heat energy to high temperature reserve.
Heat pump is composed of compressor, condenser, expansion valve, evaporator, control and so on. According to the reverse cannot cycle principle, it absorbs heat energy from low temperature reserve, and release the heat energy to high temperature reserve.

Working principle:
Enter the power energy, the refrigerant compressor can drive. It can output mechanical heating, pressure cold medium at a high temperature. High temperature go into the condenser after the water to be heated with heat exchange, medium release heat energy become liquid and flow through expansion valve, the low temperature and pressure liquid medium flow into the evaporator, then continue to absorb heat of air, change into a low temperature and pressure of the gas goes back to the compressor, completing a cycle of work. Again and again, the water temperature rising to produce the hot water.

Diameter: