Hoow much do I save buy heating with 240V instead of 120 V?

It seems more efficient to use 240V for electrical heating. But how much costly is it to use 120V to heat?

Thanks

Answers:
You pay based on kilowatts used. A kilowatt is voltage multiplied by the amperage draw. The 120 volt appliance that draws 10 amps would only draw 5 amps if were a 220 volt model. 120 time 10 = 1,200 watts. 240 time 5 = 1,200 watts. You will not save anything.

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