Utilising a small amount of electricity, the air source heat pump powers the compressor, expands the expansion tank, and produces gaseous state in the evaporator by applying a high-pressure working medium. During this process, the air's heat is greatly absorbed by the medium, which is subsequently turned into a high-pressure, high-heat liquid by the compressor. Heat is transferred to water by this liquid as it passes through the condenser. Water is heated in this manner.