The working principle of the water source heat pump unit is to transfer the heat from the building to the water source in summer; in winter, it extracts energy from a relatively constant temperature water source, and uses the principle of heat pump to raise the temperature through air or water as a refrigerant and send it to the building. In. Usually water source heat pump consumes 1kW of energy, and users can get more than 4kW of heat or cooling. The water source heat pump overcomes the lack of frosting of the outdoor heat exchanger of the air source heat pump in winter, and the operation reliability and heating efficiency are high.