Edit:
Many thanks for your input everyone!
Just to clarify, I don’t want to take into account the method of generating electricity or shipping it to the home, or the relative costs of gas and electricity. I just want to look at the heater itself! i.e. does 1500W of input into a heater produce 1500W of heat, for example? Or are there other losses I haven’t thought of. Heat pumps are off-topic.
In: 1063
Yes, electric heaters convert 100% of the power that they consume into heat. So they have an efficiency of 100%.
Heat pumps move heat from one area (outside your house) to another area (inside your house) The amount of heat they move is typically about 3 times more than the power they consume. So the in terms of energy-to-heat efficiency, they are 300%+ efficient.
But thermodynamically they are not “creating” heat from nothing. So heat pumps are not perpetual motion machines, they don’t break any of the laws of thermodynamics.
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