Originally Posted by jstevens
AFAIK a water heater is just a resistance load and all it cares about is watts. So at 110V it will draw twice the amps it draws as at 220V, and you will likely have to beef up the electrical cables
That said I would check with the manufacturer. The internals of the heater may have limitations on the amount of amps it can handle.
You are mistaken. The constant is resistance, not power. As you drop voltage to one half, resistance stays the same, current
drops by one half and power drops by three quarters.
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