What does a sauna consume per use?

A sauna heater typically has three to nine kilowatts of power, but after heating up it does not run continuously at full capacity: the thermostat switches on and off, often thirty to fifty percent of the time. A one-hour session with half an hour of heating uses approximately 4.5 kilowatt-hours, and two hours of use uses just over 6.5 kilowatt-hours, depending on power, insulation and how often the door opens. This consumption varies greatly per guest, which is why separate metering via a dedicated circuit makes more sense than including it in the general electricity bill.