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Therapist wrote: if it's 1 rand per KW, take the wattage in KWH, multiply it by the amount per KW, and multiply that by the number of hours. so for a 400w heater, you'll say (R1)*(0.400KW)*(1hour)=40c per hour. so if you want it 24 hours a day for 3 months (90 days) say 0.4*90. 36 rand extra on your bill, excluding VAT and usage taxes and so on and so forth. keep in mind, a heater's wattage varies depending on how hot it is while running. it'll pull more as it gets hotter, and the longer it runs aswell, and the length of the extension cord. everything you do affects resistance, therefore affecting watts per hour
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