The air source water heater is composed of an outdoor main unit and a heat preservation water tank. The air source heat pump unit is generally composed of main components such as a compressor, an expansion valve, an evaporator, and a condenser. In simple terms, the working principle of the air source water heater is that the low-temperature refrigerant in the compressor system continuously absorbs the low-grade heat in the outdoor air and brings it back to the compressor to raise the usable high-grade heat to heat the cold water. The air source water heater heating principle is the same as the air conditioning heating principle, but the product configuration is different. The air source water heater is mainly used for heating the water, increasing the heat exchange area of the evaporator and the condenser, and adopting the high temperature and high pressure resistance. Compressor system.