Why would a lower voltage save money?Power is the same, slightly higher current requires heavier wiring.
Is this a load of crap or sound science?
I think the idea is that since all standard mains connected devices must be capable of operating with an input voltage of as low as 207v then you can safely drop the voltage to 220.
Most of the latter with still need to do fixed amounts of work, so your heater will need to run longer to keep your house warm when operating at a lower voltage.
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