From what I understand, it’s a semantics thing.
An electric light heater converts 100% of energy into heat and light, and as those are the byproducts you want, it’s technically 100% efficient.
However, things like – the cable and internal wires have resistance, where energy is lost as heat. You want heat, so that’s fine, but if that resistance didn’t exist you would have more heat in the places you want to have it.
So arguably they’re not 100% efficient too.
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