The central air-conditioning auxiliary electric heater, or auxiliary electric heater and electric auxiliary, is a component of the central air-conditioning water circulation system. When the user uses the central air conditioner for heating and heating in winter, the heating effect of the central air conditioning unit will be greatly attenuated due to the low outdoor temperature. If the working efficiency of the central air conditioning unit is completely unable to meet the heating demand, in order to better To meet the heating needs of users, it is necessary to supplement the auxiliary heaters on the basis of the central air conditioning unit. The auxiliary heater can be used independently or connected to the main unit. The auxiliary heater is connected to the pipeline of the air conditioner. When heating in winter, the medium is heated by the auxiliary electric heater and then enters the indoor end device to output heat, and the air conditioner does not need to flow through the auxiliary heater during the summer operation. Directly enter the indoor end equipment, output cooling capacity.