The function of electric water heater is to consume electric energy through the operation of point heater and convert electric energy into heat energy of water, which can be stored water or directly heated.
Heat exchanger refers to heat exchange equipment, such as finned tube heat exchanger in indoor unit of air conditioner and evaporator in refrigerator. According to the definition of JB/T7249, heat exchanger refers to "the equipment that transfers heat between separated fluids".