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Andy Wade

wrote:

All electric resistance heating is 100% efficient.

Not so, because of the voltage drop between the meter and the appliance.
Some heat will always be dissipated in the wiring - whether this
counts as useful heat or waste heat depends on the particular
circumstances. In the worst case, with 4% voltage drop the efficiency
is only 96%.

And then of course efficiency wrt the primary energy source is generally
very poor, maybe only 35% overall (40% generation * 90% transmission *
97% utilisation).

--
Andy