Abstract: At present, the power supply is becoming increasingly severe, many enterprises are carrying out technology innovation for energy saving of wall hung electric water heaters. The heat pump technology has a good energy saving effect, but the traditional heat pump components are many and the system is complex. If heat pump is simply applied to the wall hung electric water heater, it will cause problems such as large size of the machine and difficult installation of the toilet. Subvert the traditional design idea, through the optimization and modular design of the heat pump system, break through the bottleneck that the energy efficiency of the traditional electric water heater does not exceed 100%, further improve the energy efficiency of the electric water heater, and form a new generation of energy-saving wall hung electric water heater.

Key words: Heat pump technology, Modular design, Energy-saving wall hung electric water heater