The heater has the characteristics of new appearance, compact structure, multiaspect and multi way installation. It prevents the condensing and frosting of the electric cabinet. It has small space and can keep effective heating. A variety of wiring ways, the separate control of the PTC and the fan. The heater has the function of temperature control and overheating protection to achieve accurate temperature control. The wind control function is optional. And the function can monitor running state of the fan in real time.