A typical home sauna session uses between 2 and 10 kilowatt-hours of electricity, depending on the type of sauna, its wattage, how long it takes to pre-heat, and your local utility rate. Traditional electric saunas tend to land toward the higher end of that range, while infrared saunas generally use less energy per session.
If you're thinking about adding a sauna to your home, the health benefits are probably top of mind. But right behind that is a practical question: what's this going to do to my electricity bill? It's a smart thing to consider. The short answer is that a typical home sauna session uses between 2 to 10 kilowatt-hours (kWh) of electricity. The long answer depends entirely on the type of sauna you have, how you use it, and the math behind your local utility rates.
The Biggest Factor: Sauna Type and Wattage
Not all saunas heat the same way, and the heating element's power draw is the primary driver of energy use.
- Traditional Finnish/Electric Sauna: This is what most people picture—a wooden room heated by an electric stove topped with rocks. These are powerful heaters. A common size for a 2-4 person home sauna uses a heater rated between 4.5 kW to 8 kW (4500 to 8000 watts). Some larger models can go up to 12 kW or more.
- Infrared Sauna: Instead of heating the air, infrared panels emit radiant heat that warms your body directly. These units generally consume less power. A typical 1-2 person infrared sauna uses heaters totaling between 1.5 kW to 3 kW (1500 to 3000 watts). They also don't require a long pre-heat time, which affects total energy use.
The Energy Use Equation: It's Not Just Wattage
You don't pay for the heater's wattage; you pay for the kilowatt-hours it consumes over time. Think of it like a car: wattage is the engine size (horsepower), but the kWh is the total fuel burned on a trip.
The formula is simple: Energy Use (kWh) = Heater Power (kW) x Time (hours).
But you must account for two phases of operation:
- Pre-heat Time: The 15-45 minutes it takes to bring the sauna up to temperature (typically 150-195°F for traditional, 120-150°F for infrared). The heater is running continuously during this phase.
- Session Time: The 15-30 minutes you're actually inside. In a traditional sauna, the heater cycles on and off to maintain temperature. In an infrared sauna, it often runs continuously at a lower power.
Real-World Session Estimates
Let's run the numbers for two common scenarios. We'll assume a national average electricity cost of $0.16 per kWh for these examples. You can plug in your own rate from your utility bill.
Scenario 1: Traditional 6 kW Sauna
-
Pre-heat: 30 minutes (0.5 hours) to reach 175°F.
- Energy: 6 kW x 0.5 hrs = 3 kWh
-
Session: 20 minutes (~0.33 hours). Heater cycles, running about 50% of the time.
- Energy: 6 kW x 0.33 hrs x 0.5 = ~1 kWh
- Total per Session: ~4 kWh
- Estimated Cost: 4 kWh x $0.16 = $0.64 per session
Scenario 2: Infrared 2 kW Sauna
-
Pre-heat: Minimal. Often ready in 10-15 minutes. We'll use 10 minutes (0.17 hours).
- Energy: 2 kW x 0.17 hrs = 0.34 kWh
-
Session: 30 minutes (0.5 hours). Heater runs continuously.
- Energy: 2 kW x 0.5 hrs = 1 kWh
- Total per Session: ~1.34 kWh
- Estimated Cost: 1.34 kWh x $0.16 = $0.21 per session
As you can see, the infrared sauna generally uses less energy per session due to lower wattage and faster heat-up. However, the traditional sauna's higher heat and different physiological effects are why many people prefer it.
Key Variables That Change Your Cost
- Your Electricity Rate: This is critical. Rates vary from under $0.10/kWh in some states to over $0.30/kWh in others. Always use your local rate for an accurate estimate.
- Insulation & Installation: A well-insulated sauna in a conditioned space (like a heated basement) will heat faster and lose less heat, using less energy. A poorly insulated sauna in a cold garage will work harder and cost more.
- Usage Frequency: This is where monthly cost adds up. Using a traditional sauna 4 times a week (16 sessions/month) at $0.64/session adds about $10.24 to your monthly bill. The same frequency with the infrared example would be about $3.36.
- Heater Efficiency & Thermostat: Modern sauna heaters with good controls and properly placed sensors are more efficient. Letting the temperature get too high wastes energy.
Practical Takeaways for Energy-Conscious Use
You can enjoy your sauna without worrying about a shocking bill. Here's how:
- Batch Your Sessions: If you have multiple users at home, schedule sessions back-to-back. The largest energy cost is the initial pre-heat. The second and third sessions of the day cost significantly less to maintain.
- Don't Overheat: Find your ideal therapeutic temperature (often 160-185°F). Every degree above that requires disproportionately more energy.
- Keep the Door Closed: It seems obvious, but a door left ajar during pre-heat wastes a massive amount of energy.
- Maintain It: Ensure the heater rocks (in a traditional sauna) are clean and arranged properly for good air circulation. Dust off infrared panels periodically.
- Consider Timing: If your utility has off-peak rates (e.g., cheaper electricity at night), use your sauna during those hours.
From a health perspective, the cost per session is a useful frame. For most men, the investment of less than a dollar per session for a traditional sauna—comparable to a cup of coffee—can support cardiovascular function, promote recovery, and provide significant mental downtime. The key is to understand the factors, do your own math with your local rates, and use the sauna in a way that fits both your wellness goals and your household budget.
When choosing a sauna, look for the heater's kW rating and the room's insulation specs. That information, combined with how you plan to use it, will give you the clearest picture of what it will cost to run. The goal is to make a decision that lets you focus on the benefits, not the meter.
Frequently asked questions
How much does it cost to run a home sauna per session?
Using a national average electricity rate of $0.16 per kWh, a traditional 6 kW sauna costs around $0.64 per session and an infrared 2 kW sauna costs around $0.21 per session. Your actual cost depends on your local utility rate, which can range from under $0.10 per kWh in some states to over $0.30 per kWh in others. Plugging your own rate into the formula gives you the most accurate estimate.
Does an infrared sauna use less electricity than a traditional sauna?
Yes, infrared saunas generally use less electricity per session because they draw lower wattage and don't require a long pre-heat time. A typical 1-2 person infrared sauna uses between 1.5 kW and 3 kW, compared to 4.5 kW to 8 kW for a common 2-4 person traditional electric sauna. That difference in power draw adds up meaningfully over multiple sessions each week.
How can I reduce the electricity cost of using my home sauna?
Batching sessions back-to-back is one of the most effective strategies, since the biggest energy cost is the initial pre-heat and subsequent sessions cost significantly less to maintain. Keeping the door closed during pre-heat, avoiding overheating beyond your ideal therapeutic temperature, and running sessions during off-peak utility hours can all lower your bill. A well-insulated sauna in a conditioned space also heats faster and loses less heat than one in a cold, poorly insulated area.
How long does it take a home sauna to pre-heat, and does that affect energy use?
Traditional electric saunas typically take 15 to 45 minutes to reach temperature, and the heater runs continuously throughout that phase, making pre-heat a significant portion of total energy use. Infrared saunas generally need much less warm-up time, which is one reason they consume less energy overall per session. Because pre-heat carries such a large share of the cost, users with multiple household members can save energy by scheduling sessions one after another.