If efficiency for electric devices is defined as how well it converts electric power into the desired effect, the rest usually being heat, aren’t electric heaters 100% efficient? If i had a 99% efficient heater, what undesired form of energy would the 1% go to? I see a lot of electric heaters being marketed as “way more efficient than others”.
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“Efficient” electric heater is mainly marketing term for low power heater. It’s “efficient”, because it barely does anything.
However, heat pump electric heater, is legitimately more efficient than resistance electric heater, because instead of just creating heat, it works on principle of moving heat from outside to inside (basically air conditioner backwards), which is indeed more efficient.
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