Question: how much does it cost to run my electric heater?
Answer: A common wattage for space heaters is 1,500 watts. Apply the formula 1,500 x 24 ÷ 1,000 x $0.20 to determine the cost to run the space heater for a day. (Dividing by 1,000 changes watt hours to kilowatt hours.) In this case, it will cost $7.20 if it was running for 24 hours straight.