this post was submitted on 17 Nov 2025
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I thought electric heaters were 100% efficient? All the electricity you put into it becomes heat yeah?
Yea but heat pumps have a coefficient of performance of greater than 1 cause you're moving heat instead of generating it.
Yeah my heat pump is something like 2000% efficient. It can cheat because it doesn’t convert electricity into heat, it uses electricity to move heat from the outside to the inside (or vice versa).
So, 1 kwh electric energy to an electric heater produces 1 kwh of heating energy.
So to give you an idea how a heatpump would do: looking at my heat pump's data registers right now, it says it used 3.6 kwh electric energy in the last hour to produce 12.7 kwh heating energy (air to water).