Abstract: The present invention proposes an electrothermal element which comprises a substrate, a reflective layer, an electrothermal layer, and an auxiliary layer. The electrothermal layer can emit infrared radiation which is reflected by the reflective layer and enable infrared radiation emitted from one side of the electrothermal element. The auxiliary layer can increase the thermal uniformity of the electrothermal element and also convert the thermal energy of the electrothermal element itself into infrared radiation. It not only improves overall infrared emissivity of the electrothermal element but also reduces the temperature of the electrothermal element. This invention offers an effectively and rapidly warming up solution at selected local regions, no oxygen consumption and fan noise problems, and the electrothermal element can replace the traditional ceiling or be mounted directly on the wall, to solve the disadvantage of requiring space of the conventional electric heating device.