I don't run a heater, but 11 inch flexwatt is 20 Watts per foot I think, (typically 5 feet), so 100 Watts.
Heaters are typically 750-1000 Watts.
My electric is included in my rent so I cant say how much I pay, but the landlord would have said something if my 2 racks were drawing enough power to make a noticeable difference.
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