Comment by Vendan

Resistive heating is terribly inefficient as a heating method in most cases. Much more effective(in most cases) is stuff like heat pumps. Remember, you aren't grading it on "amount of electricity turned into heat", but on "amount of heat added per unit of energy". You can technically push that above 100%. A good heat pump can do something like 3.5 CoP, i.e. you put in 1 kWh of electricity, it heats the "hot side" by 3.5 kWh of heat.