Carbon far infrared heaters are extremely efficient and cost very little to operate each month. 1 hour of sauna usage costs from 10 to 20 cents, which is around $5 a month to operate if you use it every day. All of our saunas use 110/120 volt plug in the wall power. The wattage ranges from 1320 watts (11A) to 2300 watts (20A) depending on the model.