3. To estimate hourly running cost, multiply the input power in kW by the price of your electricity per kW hour. For example, if you pay
7.53 cents per kWh and you run a 5,000 watt or 5kW heater you would multiply
7.53 cents/kWh x 5kW x 1 hour =
37.65 cents per hour to run the heater.
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