Both electric and wood-burning saunas cost roughly one to two dollars per session in fuel, so neither dominates on running costs alone. The bigger differences come down to installation, maintenance, and how much your firewood actually costs in your area.
If you're shopping for a sauna or building one, the energy question usually comes up around month two of research. Not the sexiest topic, but it matters—for your wallet, for the environment, and for how often you'll actually use the thing.
Let's break it down by the numbers, the logistics, and what each option actually costs you over a year of regular use.
Electric Saunas: Predictable and Efficient
Electric saunas run on resistive heating elements—think of a giant space heater designed for a small wooden room. They plug into a dedicated circuit, usually 240 volts for residential units, and they convert nearly all the electricity they draw directly into heat.
Typical power draw: 6 to 12 kilowatts per hour of operation, depending on the size of the sauna and the heater's rating. A standard 6x8 foot sauna with a 9 kW heater will pull about 9 kWh for every hour it runs.
Heating time: 30 to 45 minutes to reach 180°F from a cold start, assuming the room is well-insulated.
Cost per session: At the U.S. national average of $0.14 per kWh, a one-hour session runs roughly $1.26. If you sauna four times a week, that's about $5 per week, or $260 per year.
The catch: Electric saunas lose heat fast when the heater cycles off. If you open the door frequently or the room isn't sealed properly, the heater has to work harder to maintain temperature. That drives up consumption.
Efficiency note: Electric heaters are close to 100% efficient at converting electricity to heat. The inefficiency isn't in the heater—it's in how much heat the room retains. A well-built sauna with proper insulation and a tight door will use significantly less energy than a drafty one with the same heater.
Wood-Burning Saunas: High Input, Different Physics
Wood-burning saunas use a stove that burns split logs. The heat comes from combustion, radiation from the stove body, and the hot stones piled on top. The experience is different—drier heat, more radiant warmth, and a ritual element that electric saunas don't replicate.
Fuel consumption: A typical wood-burning sauna stove burns about 4 to 8 pounds of wood per hour, depending on the stove size, how hot you run it, and how well the stove is designed. A full session usually requires two to three logs, with one reload after the initial fire catches.
Heating time: 45 minutes to 90 minutes, depending on the stove, wood dryness, and outside temperature. Wet wood or poor draft can double that.
Cost per session: A cord of seasoned hardwood (128 cubic feet) costs $200 to $400 depending on your region. That's roughly 2,000 to 3,000 pounds of wood. At 6 pounds per session, a cord gives you 300 to 500 sessions. That works out to $0.60 to $1.30 per session—comparable to electric, sometimes cheaper in areas with abundant firewood.
The catch: Wood stoves are less efficient than electric heaters. A good modern sauna stove might hit 60 to 70% combustion efficiency. Older barrel stoves can drop below 40%. That means a significant portion of the wood's energy goes up the chimney as unburned gases and heat loss.
Real-world note: If you have to buy kiln-dried wood or live in an urban area where firewood is expensive, wood-burning can cost more than electric per session. If you split your own wood from a property with mature trees, it's nearly free.
The Hidden Costs That Change the Math
Installation
Electric saunas need a dedicated electrical circuit. If your panel has space and the run is short, that's $500 to $1,500 for an electrician. If you need a panel upgrade or a long trench to an outdoor sauna, that jumps to $3,000 or more.
Wood-burning saunas need a chimney and proper clearances to combustible materials. A stainless steel chimney kit runs $400 to $1,000, and installation is straightforward if you're handy. If you hire a mason to build a stone chimney, expect $2,000 to $5,000.
Maintenance
Electric heaters are nearly maintenance-free. Replace the heating elements every 5 to 10 years if they fail, at $100 to $200. Wood stoves need chimney cleaning once or twice a year ($100 to $200 per cleaning if you hire it out), and the stove itself will eventually need new gaskets and firebricks.
Environmental Cost
Electric saunas are only as clean as your local grid. If your power comes from coal, a one-hour session produces about 8 pounds of CO₂. If you're on a grid with high renewables, that number drops.
Wood-burning releases CO₂ that was already in the carbon cycle—trees absorbed it as they grew. But it also releases particulate matter, volatile organic compounds, and carbon monoxide. A well-maintained stove with dry wood burns cleaner than a smoky one, but it's never zero-emission.
Which One Uses Less Energy Overall?
If you measure energy strictly as kilowatt-hours or BTUs consumed at the point of use, electric saunas use less. They heat faster, waste less heat up a chimney, and convert input energy to room heat more efficiently.
But if you measure cost per session or environmental impact, the answer depends on your situation.
Electric wins if: You have easy access to a 240V circuit, you want consistent temperature control, you live in an area with moderate electricity rates, and you prioritize convenience.
Wood wins if: You have cheap or free firewood, you want the experience of building a fire, you live off-grid or in a rural area, or you want a sauna that works during a power outage.
What Most People Don't Consider
The biggest driver of energy consumption isn't the heat source—it's the sauna itself. A poorly insulated sauna with a single-pane glass door will cost twice as much to heat, regardless of whether you use electric or wood. Spend your money on insulation, a tight door, and a well-sealed vapor barrier before you worry about the heater.
The second biggest factor is how you use it. Preheating for 90 minutes when 45 minutes would do, opening the door every five minutes to check on things, or running the sauna at 200°F when 170°F is plenty—those habits matter more than the difference between electric and wood.
Bottom line: Both options cost roughly $1 to $2 per session in fuel. The bigger differences are in upfront cost, maintenance, and the experience. If you want a sauna that turns on with a switch and you never think about again, go electric. If you want a sauna that rewards a few minutes of hands-on work with heat that feels different on your skin, wood is worth the extra effort.
Either way, the health benefits don't care how you make the heat. They just care that you show up.
Frequently asked questions
How much does it cost to run an electric sauna per year?
At the U.S. national average electricity rate, a typical one-hour session in an electric sauna costs around $1.26. If you use the sauna four times a week, that adds up to about $260 per year in electricity costs.
Is a wood-burning sauna cheaper to run than an electric one?
It depends on what you pay for firewood. A cord of seasoned hardwood can yield hundreds of sessions at roughly $0.60 to $1.30 each, which is comparable to electric and sometimes cheaper. If you split your own wood from a property with mature trees, the fuel cost is nearly free, but if you're buying kiln-dried wood in an urban area, wood-burning can actually cost more per session than electric.
What hidden costs should I factor in when choosing between electric and wood-burning saunas?
Electric saunas require a dedicated 240V circuit, and installation can run from $500 to $1,500 for a straightforward job or $3,000 or more if a panel upgrade or long trench is needed. Wood-burning saunas need a chimney, and a stainless steel chimney kit runs $400 to $1,000, though hiring a mason for a stone chimney can cost $2,000 to $5,000. Wood stoves also need chimney cleaning once or twice a year.
What's the biggest factor affecting sauna energy costs?
The article points out that the biggest driver of energy consumption is the sauna structure itself, not the heat source. A poorly insulated sauna with a single-pane glass door can cost twice as much to heat regardless of whether you use electric or wood. How you use the sauna also matters a great deal, since habits like over-preheating or frequently opening the door drive up costs significantly.