How much can I expect to pay monthly for my sauna?

If you use your sauna 3 times per week, a 6 kW heater will use approximately $4 to $6 per month. A 2.1 kW heater, on the other hand, would use about $2/month. Far-infrared saunas typically use $3 to $5 per month. Steam baths usually average $3 to $5 per month.