One of the things many people don’t understand is there is little or no difference between the efficiencies of resistance-style electric heaters.
That’s because they all put out 3,414 Btu per watt, per hour. A 1,000-watt wall baseboard heater or an oil-filled electric radiator puts out exactly the same amount of heat per hour (3,414 Btu/hr.) as a 1,000-watt electric hair drier, a 1,000-watt electric range element, a 1,000-watt motor or even 1,000 watts of efficient light-emitting diodes (LEDs).