It depends on two factors, one is the electric heat conversion efficiency, the two is the power. The high the electric heating conversion efficiency, the less electricity it consumes. Well, if we understand this we can analyze whether our household appliances consumes electricity. Power is a fixed value, which is fixed before we buy. For example, we buy a electrothermal film heater whose power is 2000W. This means that the heater consumes 2 kwh of electricity per hour, which is 2 degrees, if it is 1500W, that is 1.5 degrees Electric per hour. The electrothermal conversion efficiency is to consume things unease to know, but we can generally analyze like so: The process of heating is a process that transfers electric energy into heat energy, so we would hope that electrothermal conversion efficiency be higher if we want to get maximum heat. According to the law of conservation of energy, the greatest possibility is 100% conversion. But in fact, the conversion of electric energy into heat energy also includes the conversion into light, (such as small solar heating, which is also luminous in the the moment of heating, a lot of power is converted into the energy we don't need, so the conversion efficiency is low, magnetic energy and other energy. Therefore, in general, the electrothermal conversion efficiency of most heating body is almost the same in the current market, the transfer efficiency of heat body that is not luminous is higher than those giving out lights.
