Air source heat pumps use very little electrical energy to absorb a large amount of low-temperature heat energy in the air, turn it into high-temperature heat energy through the compression of the compressor, and transmit it to the water tank to heat hot water, so it has low consumption, high efficiency, fast speed, and good safety. , strong environmental protection, continuous supply of hot water. As a hot water system it has incomparable advantages. However, a major disadvantage of air source heat pumps is that the heating capacity and heating performance coefficient decrease as the outdoor temperature decreases. Therefore, its use is limited by the ambient temperature. It is generally suitable for areas with a minimum temperature above -10°C. Combining heat pump technology with solar energy to supply hot water, air source heat pumps are undoubtedly an ideal auxiliary heating equipment.

The heat pump hot water unit follows the law of conservation of energy and the second law of thermodynamics. Using the principle of heat pump, it only needs to consume a small part of the mechanical work (electric energy) to transfer heat from a low-temperature environment (atmosphere or underground water, etc.) to a high-temperature environment. in a water heater to heat and produce high-temperature hot water. Heat pumps can be compared with water pumps. Water cannot flow spontaneously from low places to high places. To transport water from low places to high places, a water pump must be used, which consumes part of the electricity to send the water to the water tank at high places. . Similarly, according to the second law of thermodynamics, heat cannot spontaneously transfer (transmit) from a low-temperature environment to a high-temperature environment. To achieve this purpose, a machine must be installed that consumes part of the mechanical work (such as electrical energy) to transfer the low-temperature environment to the high-temperature environment. The heat is transferred to the high temperature environment. Such a machine is called a "heat pump". The function of a heat pump is to take out the heat in the air or low-temperature water, and send it to the high-temperature environment for use together with the heat energy converted from the electrical energy used.