How Much Does It Cost to Run a Traditional Sauna?

Running a traditional electric sauna costs roughly $0.70 to $1.60 in electricity per session at average U.S. power rates, or about $12 to $26 a month for regular home use. The exact number depends on your heater size, how long you run it, your local electricity rate, and how well the room holds heat.

The short answer

The cost to run a traditional sauna comes down to one appliance: the electric heater. Most home units use a 4.5 to 8 kW heater, and a typical session draws about 4 to 9 kilowatt-hours (kWh) once you add heat-up time to the time you actually sit inside. At the U.S. average residential electricity price of about 18 cents per kWh, that works out to roughly $0.70 to $1.60 per session. Use your sauna four times a week and you are looking at about $12 to $26 a month, or $140 to $310 a year. Wood-burning saunas trade the power bill for firewood, which usually lands in a similar range per session. Bigger heaters, longer sessions, colder rooms, and higher local rates push the number up. Good insulation, shorter warm-ups, and off-peak power pull it down.

How much electricity does a traditional sauna use per session?

A traditional sauna heats a full room of air and rocks, so almost all of its energy use comes from the electric heater. Two phases drive the total: the heat-up phase and the maintenance phase.

During heat-up, the heater runs at close to its full rating to bring the room from room temperature to roughly 160 to 190 degrees Fahrenheit. This usually takes 30 to 45 minutes. Once the room is hot, the thermostat cycles the heater on and off to hold the temperature, so it draws only about half of its rated power during the session itself.

Here is a simple example. A 6 kW heater that runs near full power for a 40 minute warm-up uses about 4 kWh. If you then sit for 30 minutes while it cycles at roughly half power, you add about 1.5 kWh, for a total near 6 kWh. At 18 cents per kWh, that session costs about $1.08.

Traditional sauna running cost by heater size

Heater size scales with room size, so a one to two person sauna costs less to run than a four to six person model. The estimates below use the U.S. average residential rate of about 18 cents per kWh and assume 16 sessions a month. Treat them as ballpark figures and check your own rate for a closer number.

Rates vary widely by state. EIA data shows residential prices ranging from around 8 cents per kWh in the lowest states to more than 35 cents in Hawaii, so your real cost could be roughly half or double the figures above. You can look up recent state averages on the EIA electricity price data pages.

How much does a wood-burning sauna cost to run?

A wood-burning sauna has no electric heater, so it does not add anything to your power bill. Instead you buy firewood. A single session usually burns about 10 to 20 pounds of seasoned hardwood. A full cord of firewood costs somewhere around $300 to $450 in most regions and holds a lot of sessions, so the fuel cost per session tends to land near $0.50 to $2.00, similar to running an electric model.

Wood-burning saunas do carry a few extra costs that electric units do not. You need dry storage for the wood, a chimney that gets swept once a year, and a little time to lay and light the fire before each session. If you are weighing the two heat sources, our guide to electric versus wood-burning saunas covers the trade-offs in more detail.

Are there other costs beyond electricity?

The heater is the main ongoing cost, but a few smaller ones are worth planning for. A traditional heater uses no power when it is switched off, so there is no standby draw between sessions. Maintenance is light: you replace the sauna rocks every year or two, wipe down the benches, and occasionally treat the wood. Water for loyly, the steam you make by pouring water over the rocks, is negligible. The one larger expense is upfront rather than ongoing. Most 6 kW and larger heaters need a dedicated 240 volt circuit, so first-time buyers often pay an electrician a one-time fee to run the wiring. That is an installation cost, not a running cost, but it belongs in your total budget.

What affects your traditional sauna running cost the most?

Five things move the number more than anything else:

• Heater size and room volume. A bigger room needs a bigger heater and more energy to warm. Buy the heater sized for your space rather than oversizing it.
• Insulation and glass. A well-insulated room with a vapor barrier and modest glass holds heat and cuts run time. Large glass walls look great but leak heat and raise cost.
• Session length and warm-up. Every extra 15 minutes of heat-up or sitting adds kWh. Preheating only as long as you need helps.
• Local electricity rate. This is often the single biggest factor. The same sauna costs far more in a high-rate state than a low-rate one.
• Time of day. If your utility offers time-of-use pricing, running the sauna during off-peak hours can lower the cost of each session.

Traditional versus infrared: which is cheaper to run?

Infrared saunas warm your body directly instead of heating a full room of air, so they often run at lower wattage and cost a little less per session. The gap is usually small in real dollars, and a traditional sauna gives you the higher heat and steam that many buyers prefer. If you want to compare the two, see our breakdown of what an infrared sauna costs per month. Buyers who want both experiences in one cabin sometimes choose hybrid saunas, which pair a traditional heater with infrared panels.

How to lower the cost of running your traditional sauna

A few habits keep the bill low without changing how the sauna feels:

• Preheat only as long as needed, and close the door while it warms up.
• Choose a heater matched to your room size, not larger.
• Insulate the walls and ceiling well and keep glass to a reasonable size.
• Run sessions back to back when more than one person is using it, so you pay for one warm-up instead of several.
• Shift sessions to off-peak hours if your utility charges time-of-use rates. You can read more about how rates are set on the EIA guide to electricity prices.

Who is a traditional sauna best for?

If you like intense, humid heat and plan to use a sauna several times a week, the low per session cost makes a traditional model easy to justify over time. If you want the fastest warm-up and the lowest possible wattage, an infrared model may fit better. Either way, the running cost is a small part of ownership compared with the purchase and the one-time wiring.

Frequently asked questions

Is a traditional sauna expensive to run? For most homes, no. At average U.S. electricity rates a session costs about the same as running a clothes dryer for a cycle, roughly $0.70 to $1.60. Regular use adds about $12 to $26 a month to a typical power bill.

Does a traditional sauna use a lot of electricity? A single session uses about 4 to 9 kWh, which is meaningful but not extreme. The heater draws the most power during the warm-up and then cycles down once the room is hot.

Is it cheaper to run a sauna at night? It can be, but only if your utility uses time-of-use pricing with lower off-peak rates. On a flat rate, the time of day does not change the cost.

A traditional sauna is one of the cheaper wellness investments to operate once it is installed, and the running cost is easy to budget for. If you are ready to compare models and heater sizes, browse our traditional saunas for sale, use our sauna buying guide to match a unit to your space, and check whether your purchase qualifies for HSA or FSA savings. Have a question about heater sizing or wiring? Our team is happy to help.