Sauna use has a smaller environmental footprint than most people expect, with energy consumption being the biggest variable and water use being surprisingly low, though the impact differs depending on whether you choose a traditional electric, wood-fired, or infrared sauna and how you use it.
I’ve been getting this question more often lately, and it makes sense. Guys who care about their health tend to care about the planet too. The good news is that the environmental footprint of sauna is smaller than most people assume, but there are real differences depending on what kind of sauna you use and how you use it.
Let’s break down the numbers and the trade-offs.
The energy story: Traditional vs. infrared
The biggest environmental variable is energy consumption, and it varies dramatically by sauna type.
Traditional Finnish saunas (electric or wood-fired) heat a room full of rocks to between 150°F and 195°F. A typical electric sauna heater runs between 4,500 and 9,000 watts. For a 45-minute session with warm-up time, you’re looking at roughly 2.5 to 4.5 kilowatt-hours (kWh) of electricity. That’s comparable to running a central air conditioner for about an hour in summer.
Infrared saunas operate at lower temperatures (120°F to 140°F) because they heat your body directly rather than the air. Their heaters typically draw 1,500 to 3,000 watts. A 45-minute session uses roughly 1.1 to 2.3 kWh, about half the energy of a traditional sauna.
To put that in perspective: A traditional sauna session costs roughly $0.40 to $0.80 in electricity at average U.S. rates. Infrared runs around $0.20 to $0.40. That’s less than a latte.
Wood-fired saunas are a different calculation. The carbon footprint depends on whether the wood is sustainably sourced. A single session might burn 2 to 4 pounds of wood. If that wood comes from managed forestry operations, the carbon released is roughly what the tree absorbed during growth, making it near carbon-neutral. If it’s from old-growth forest or transported long distances, the math changes.
Water usage: Lower than you’d think
Here’s the part that surprises most guys: Saunas don’t actually use much water.
In a traditional sauna, water is poured over rocks to create steam (löyly, in Finnish). A typical session uses maybe 4 to 8 ounces of water total. That’s nothing. You spill more brushing your teeth.
The bigger water footprint comes from what you do after the sauna. Cold showers, cold plunges, or rolling in snow—those are where the water adds up. A 5-minute cold shower uses about 10 to 15 gallons of water. A cold plunge tub that’s refilled weekly uses more.
Infrared saunas use zero water during operation. No steam, no water on rocks. Your sweat provides all the moisture.
The research on sweat composition is relevant here. Studies have found that sweat contains trace amounts of heavy metals including lead, cadmium, and arsenic (Sears et al., 2012, Journal of Environmental and Public Health). So if you’re sweating in a sauna, you’re excreting things your body filtered out. But the water used is your own metabolic water plus whatever you drank beforehand.
The infrastructure footprint
Saunas aren’t disposable products. A well-built sauna lasts 20 to 40 years. Cedar and hemlock are common materials, both renewable if sourced responsibly. The biggest environmental cost in a sauna’s lifecycle is actually the manufacturing of the heater elements and the energy used during its decades of operation, not the materials themselves.
Compare that to something like a treadmill, which has a similar manufacturing footprint but typically ends up in a landfill after 5 to 10 years. Saunas are long-term investments in both your health and the planet.
How to minimize your impact
If you’re concerned about the environmental footprint of regular sauna use, here’s what the data suggests:
- Go infrared if you sauna daily. The energy savings add up. A daily 45-minute infrared session uses about 500 kWh per year. Traditional would be double that.
- Batch your sessions. Heating the sauna from cold uses the most energy. If you’re doing multiple sessions in one day (common in Finnish tradition), the second session uses almost no additional energy because the room stays hot.
- Use a timer. Letting a sauna run empty for 30 minutes after you finish wastes energy. Most modern heaters have timers. Use them.
- Cold shower strategically. If you’re doing contrast therapy, keep showers under 3 minutes. That cuts water usage by half compared to a full shower.
- Choose wood wisely. If you go wood-fired, source locally and from managed forests. Kiln-dried hardwoods burn cleaner and produce less particulate matter than softwoods or green wood.
- Consider outdoor saunas. In cold climates, an outdoor sauna actually loses less heat to the surrounding environment than an indoor sauna that’s venting into your house, which your HVAC then has to compensate for.
The bigger picture
Here’s what I tell guys who ask this question: A sauna session uses less energy than driving 5 miles in an average car. Less water than making a single hamburger (that takes about 660 gallons when you account for the whole supply chain). And the health benefits—cardiovascular improvements, better sleep, reduced inflammation—might actually reduce your healthcare footprint over time.
If you’re already living a reasonably conscious lifestyle, adding regular sauna use isn’t going to move your environmental needle much. The real impact comes from transportation, diet, and home energy use. Sauna is a rounding error in that equation.
That said, being aware of the numbers is good practice. It means you can make informed choices about which type of sauna fits your values and your routine. And if someone challenges you on the environmental cost, you’ve got the data to have that conversation honestly.
As always, individual health decisions should be discussed with your doctor. This information is for educational purposes and is not medical advice.
Frequently asked questions
How much energy does a sauna use per session?
A traditional electric sauna running at a full heat uses roughly 2.5 to 4.5 kilowatt-hours for a 45-minute session, while an infrared sauna uses roughly 1.1 to 2.3 kilowatt-hours for the same length session, about half as much. That's comparable to running a central air conditioner for about an hour in summer. If you sauna daily, those differences add up over the course of a year.
Do saunas use a lot of water?
Traditional saunas use very little water during a session, typically around 4 to 8 ounces poured over the rocks to create steam. Infrared saunas use zero water during operation. The real water footprint comes from what you do afterward, since a 5-minute cold shower uses about 10 to 15 gallons.
Are wood-fired saunas bad for the environment?
It depends on the source of the wood. If the wood comes from managed forestry operations, the carbon released during burning is roughly what the tree absorbed during growth, making it near carbon-neutral. Wood transported long distances or sourced from old-growth forest changes that calculation significantly. Kiln-dried hardwoods also burn cleaner and produce less particulate matter than softwoods or green wood.
How can I reduce the environmental impact of regular sauna use?
Choosing infrared over traditional saves roughly half the energy per session, and using a timer so the sauna doesn't run empty after you finish cuts waste further. Batching multiple sessions in one day helps too, since the room stays hot and the second session uses almost no additional energy. Keeping post-sauna cold showers under 3 minutes cuts water usage by half compared to a full shower.