If the electric heating film is installed, you can feel numbness without direct contact, it must be electric leakage. Find an installation company or a seller to repair it, which is a serious quality problem.
At present, many sellers make the wattage very high, in order to show obvious heating effect, but since then, the use cost has increased, electromagnetic radiation will also increase, and electric heating films generally dissipate heat at low temperature. Matching with the warmer controller, it is the same principle as frequency conversion, and it always saves electricity.