Since you are billed per KW and not volts or current ... no solution is "cheaper" than the other as far as your energy bill is concerned. All the current goes into producing heat. You can only vary the amount of time you operate them or the power level consumed during operation
convectors have the added advantage of moving the air faster than a baseboard resulting in more even heating and less operating time.
convectors have the added advantage of moving the air faster than a baseboard resulting in more even heating and less operating time.