Do Saunas Use Lots of Electricity? Real Numbers Explained

Do Saunas Use Lots of Electricity? Real Numbers Explained

It's one of the first questions people ask before buying a home sauna: how much is this going to add to my electric bill? The answer might surprise you - it's probably less than you think, but it's worth understanding the actual numbers so you can plan accordingly.

Let's break down the real electricity costs with actual calculations, not vague estimates.

How Much Power Does a Sauna Use?

Sauna power consumption depends entirely on the type and size:

Traditional Electric Saunas

• Small (1-2 person): 3-6 kW heater
• Medium (3-4 person): 6-8 kW heater
• Large (5-6 person): 8-12 kW heater

A typical home sauna heater runs at about 6 kW. That's roughly equivalent to running two standard space heaters at the same time.

Infrared Saunas

• Small (1-2 person): 1.2-1.8 kW
• Medium (2-3 person): 1.8-2.5 kW
• Large (3-4 person): 2.5-3.5 kW

Infrared saunas use significantly less power because they heat your body directly rather than heating the entire air volume of the room. A typical infrared unit uses about 1.5-2 kW.

What Does a Sauna Session Actually Cost?

Here's the math using the US average electricity rate of about $0.16 per kWh:

Traditional Electric Sauna (6 kW heater)

• Preheat time: 30-40 minutes at full power = 3-4 kWh
• Session time: 20 minutes (heater cycles on and off, averaging about 50% power) = 1 kWh
• Total per session: about 4-5 kWh
• Cost per session: $0.64-$0.80

Infrared Sauna (1.8 kW)

• Preheat time: 10-15 minutes = 0.3-0.45 kWh
• Session time: 30 minutes = 0.9 kWh
• Total per session: about 1.2-1.35 kWh
• Cost per session: $0.19-$0.22

Monthly and Annual Costs

Here's what regular use looks like on your electric bill:

Traditional Sauna - 3 Sessions Per Week

• Monthly: roughly 52-65 kWh = $8-$10/month
• Annual: roughly 624-780 kWh = $100-$125/year

Traditional Sauna - Daily Use

• Monthly: roughly 120-150 kWh = $19-$24/month
• Annual: roughly 1,460-1,825 kWh = $234-$292/year

Infrared Sauna - 3 Sessions Per Week

• Monthly: roughly 15-17 kWh = $2.40-$2.75/month
• Annual: roughly 180-210 kWh = $29-$34/year

Infrared Sauna - Daily Use

• Monthly: roughly 36-41 kWh = $5.76-$6.50/month
• Annual: roughly 438-500 kWh = $70-$80/year

How Does That Compare to Other Things?

To put sauna electricity use in perspective:

• Clothes dryer: About 5 kWh per load. Running your sauna is roughly equivalent to doing one load of laundry.
• Central AC: 3,000-5,000 kWh per summer season. Your sauna uses a fraction of what air conditioning costs.
• Hot tub: 200-400 kWh per month. Hot tubs use considerably more electricity than saunas because they maintain temperature 24/7.
• Electric oven: About 2-3 kWh per hour. A sauna session uses about as much as cooking a meal.

Factors That Affect Your Costs

Local Electricity Rates

The US average is about $0.16/kWh, but rates vary wildly. Hawaii pays over $0.40/kWh. Parts of the Pacific Northwest pay under $0.10/kWh. Your actual cost could be half or double the estimates above depending on where you live.

Insulation Quality

A well-insulated sauna retains heat better, which means the heater cycles less during your session. Poor insulation makes the heater work harder and run longer, increasing electricity use. This is one of the most important differences between cheap and quality indoor saunas.

Outdoor Temperature

An outdoor sauna in Minnesota winter takes more energy to preheat than one in Texas. The starting temperature of the room affects how long the heater runs at full power during warmup.

Session Length and Frequency

Obviously, longer and more frequent sessions use more electricity. But the preheat phase is the biggest energy draw. Two back-to-back sessions use much less than two sessions hours apart because the sauna is already hot for the second round.

Does a Sauna Need a Special Electrical Circuit?

It depends on the type:

• Most infrared saunas plug into a standard 120V/15A or 20A outlet. No special wiring needed.
• Traditional electric saunas typically require a dedicated 240V circuit, similar to an electric dryer or oven. If you don't have one near your sauna location, an electrician will need to run one - expect to pay $200-$500 for this work.

This is a one-time installation cost, not an ongoing expense. It's worth budgeting for if you're buying a traditional sauna.

Tips to Minimize Electricity Costs

• Preheat only when you're about to use it - Don't leave the sauna heating for hours before your session.
• Use a timer - Set the heater to turn on 30-40 minutes before you plan to sauna, so it's ready when you are and doesn't run unnecessarily.
• Batch your sessions - If multiple family members use the sauna, go back-to-back instead of reheating from cold each time.
• Keep the door closed - Every door opening dumps heat and forces the heater to recover.
• Maintain insulation - Check for gaps, worn weatherstripping, or areas where heat might be escaping.

The Bottom Line

A home sauna is not a significant electricity burden for most households. A traditional electric sauna used 3 times per week costs roughly $8-$10 per month. An infrared sauna costs about $2-$3 per month at the same frequency. That's less than a streaming subscription and far less than a gym or spa membership. The electricity cost should not be a reason to avoid buying a sauna.