Electric heaters always have an energy efficiency of 3.413 B.T.U.s per watt hour, regardless of the design. It doesn't matter whether you are talking about a 4 watt night light bulb or a multi-killowatt electric furnace.
Creating a system that has hot rooms and cold rooms is a source of wastefulness, but that is called bad design, not due to variation of the power line voltage.
Creating a system that has hot rooms and cold rooms is a source of wastefulness, but that is called bad design, not due to variation of the power line voltage.
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