A standard resistive heater is approx 99.9% efficient
That means for every 1kw of power you put in, about 999 watts of heat comes out.
@raytaylor Where does the last 1 watt of electrical energy go to if it doesn't get converted into heat? Keeping in mind the laws of physics, in that energy cannot be created or destroyed.
Sure, it doesn't sound like much. But multiply that 0.001% by every single electric stove, heater, hot water cylinder, kettle etc in NZ. Suddenly that 0.001% equals a lot of energy supposedly going somewhere other than heat.