There’s no one type of electric heater — infrared, ceramic, or otherwise — that’s more efficient than another. So, it really comes down to the level of wattage. An energy-efficient electric heater is typically between 500 to 1500 watts. To determine how a heater will affect your electric bill, first find out the wattage of your unit, your cost of electricity per kilowatt, and the amount of time you plan to use the heater. From there, you can run the numbers in an online calculator to estimate how much your bill will increase.