As a prudent consumer,the first step of purchasing heat pumps is always to understand how do they work.Air source heat pumps consist mainly with four parts: Compressor, heat exchanger, throttling set, evaporator.
The refrigerant in the evaporator absorbs heat from the air, which makes the air source heat pump able to make three copies of heat by a power and has COP reach more than 4. After absorbing the heat, the temperature and pressure rise by the compression of the compressor, making the circulation to the heat exchanger for heating the water. Then throttling set device to buck,letting the pressure and temperature reduce to the beginning level for cooling down the evaporator. Finally the circle starts again from absorbing heat from the air in the evaporator.
In this way, air source heat pump is able to produce large amount of hot water with high water pressure 24 hours for all need, while at the same time costing the less energy.