Do Infrared Saunas Take a Lot of Electricity? The $3-a-Month Math, Metered Worst-Case Test, and 120V vs 240V Catch

A home infrared sauna's purchase price is only part of the budget. You also want to know what happens to your electric bill when you start using it several times a week.

For a sauna drawing 1.8 kW continuously for one hour, electricity costs $0.36 per use at $0.20 per kilowatt-hour (kWh). At three uses a week, that works out to about $4.68 a month or $56.16 a year. Those are calculated examples, not a universal running cost: cabin size, preheating, heater controls, accessories, and your utility rate all affect the total.

A larger custom infrared sauna needs its own estimate. Applying a compact cabin's electricity figures to a spacious room with several seating positions and integrated red light can understate consumption.

How much electricity does a 2-person infrared sauna use per session?

Start with the cabin's specified input power. Seating capacity alone doesn't tell you how much electricity it uses.

For example, a 1.8 kW sauna running continuously for 30 minutes consumes 0.9 kWh. If you also preheat it for 20 minutes at the same power, that adds 0.6 kWh, bringing the total to 1.5 kWh. At $0.20/kWh, the complete use costs $0.30.

Actual consumption can be lower if the heaters cycle or reduce output. It can be higher if you preheat longer or operate accessories that aren't included in the stated wattage.

Heater wattage by sauna type and size

A compact cabin, a portable enclosure, and a custom sauna designed for several people have different heating requirements. Look for the input wattage of the equipment you're considering rather than borrowing a number from another format.

For a custom cabin, room dimensions, glass area, installation location, heater layout, and intended use all belong in the design discussion. At SaunaCloud, we plan VantaWave® heater placement around the benches and provide electrical plans for the project through our custom infrared sauna design process.

Watts and kilowatt-hours mean different things

Watts describe power at a particular moment. Kilowatt-hours describe electricity consumed over time.

A 1,800-watt appliance draws 1.8 kW when operating at that power. Run it for one hour and it consumes 1.8 kWh; run it for half an hour and it consumes 0.9 kWh. If its power varies, the energy total depends on how long it spends at each level.

Comparisons with ovens, dryers, or refrigerators are only useful when you also account for operating time and cycling. Two appliances with the same rated wattage can contribute very different amounts to your monthly bill.

Cost to run an infrared sauna: per hour, month, and year

The following examples use $0.20/kWh, one hour of continuous operation at the stated input power per use, and three uses per week. That hour includes all warm-up and occupied time in the example. If your routine takes longer, add the extra time.

These are arithmetic examples, not specifications or measured results for particular saunas. Dollar amounts are in USD.

The $0.20 rate is an illustration, not a claim about the current national average. Use the applicable per-kWh charges on your bill, including delivery charges that rise with consumption. Fixed monthly charges generally don't change because you add a sauna.

The monthly cost formula

Monthly electricity cost = kWh per complete use × uses per month × price per kWh.

If you don't have a measured kWh figure, estimate energy from input power in kW multiplied by operating hours. Virginia Cooperative Extension's guide to appliance energy use explains this calculation and how equipment settings affect actual consumption.

For a sauna with different warm-up and occupied-session power levels, calculate each period separately. As an illustration:

• Preheat: 1.8 kW × 0.25 hours = 0.45 kWh.
• Occupied session: 1.8 kW × 0.5 hours × an assumed 70% duty cycle = 0.63 kWh.
• Total: 1.08 kWh × $0.20 = about $0.22 per use.

At 13 uses a month, that example costs about $2.81. The 70% duty cycle is an assumption for the calculation; it should not be treated as a specification for every infrared sauna. Add any separate accessory loads.

Why published infrared estimates disagree

Some estimates count only the time spent sitting in the sauna. Others include preheating. Some assume continuous full power, while others allow for heater cycling. Electricity rates and frequency of use can differ substantially, too.

Before comparing two monthly estimates, check the cabin's electrical input, total operating time, assumed duty cycle, number of uses, and electricity rate. A low figure is useful only if those assumptions resemble your setup.

How much electricity does preheating use?

Preheating can account for a substantial share of a short sauna routine, but there isn't one percentage that applies to every cabin.

A 1.8 kW heater operating continuously for 15 minutes consumes 0.45 kWh. Run it for 30 minutes and it consumes 0.9 kWh. The share of total energy used during warm-up then depends on the length and power draw of the occupied session.

Starting temperature, cabin construction, glass area, target temperature, and available heater power affect warm-up. A sauna in a cold garage may behave differently from the same cabin in a heated room. Ask for warm-up expectations that match your installation conditions.

If two household members use the sauna one after another, the second person can benefit from the cabin already being warm. That reduces the need for another cold start, although the heaters may still consume electricity between and during sessions.

What an electricity meter can tell you

A measured complete-use total is more useful than a generic online estimate. Record the electricity consumed from the start of preheating until you switch the sauna off, along with the room temperature, target setting, and occupied time.

Repeat the measurement across several normal uses. For an outdoor installation, measurements in different seasons can give a more useful budget than a single mild-weather test.

For plug-in equipment, use only a meter approved for the voltage, current, and load, and follow the sauna manufacturer's instructions. A general-purpose smart plug isn't automatically suitable for a sauna. For hardwired or higher-power systems, ask an electrician about appropriate circuit-level monitoring.

If you're planning an off-grid installation, allow for both total energy in kWh and the system's simultaneous power demand in kW. A compact cabin's test result isn't a reliable sizing figure for a larger custom room.

120V vs 240V: what your outlet can run

Voltage alone doesn't determine running cost. A system that consumes 2 kWh costs the same at a given utility rate whether it operates on 120V or 240V.

Voltage and current do matter for installation. Some compact infrared cabins are designed for 120V service; other cabins require 240V or a different circuit arrangement. Even a sauna with a familiar plug may require a dedicated circuit. An existing outlet's appearance doesn't establish that the wiring and circuit are suitable.

Use the manufacturer's installation instructions and project electrical plans, and have a qualified electrician assess any required work. A breaker rating describes circuit capacity; it isn't a measurement of the sauna's actual electricity consumption.

For a custom SaunaCloud project, electrical planning belongs alongside the room dimensions and seating layout. Our guide to infrared sauna purchase and installation costs covers the broader budget beyond the electricity bill.

Infrared vs traditional sauna electricity cost

A lower-powered infrared cabin can cost less to run than a higher-powered traditional electric sauna. The size of the difference depends on the two systems and how you use them.

If a 1.8 kW infrared system and a 6 kW traditional heater each operated continuously for one hour, they would consume 1.8 kWh and 6 kWh respectively. At $0.20/kWh, that would cost $0.36 and $1.20. This calculation compares those assumed loads and times; it doesn't establish a fixed savings percentage for every infrared and traditional sauna.

Choose the experience you want, then estimate the cost of the installation that provides it. Comparing a small infrared cabin with a much larger traditional sauna won't tell you which is more efficient for the same space and use.

Does integrated red light therapy increase electricity use?

A red light system consumes electricity when it's on, so include it in the estimate if it isn't already part of the total input figure you're using.

Red light electricity cost = electrical input in kW × operating hours × price per kWh.

For example, a hypothetical 200-watt lighting system running for 30 minutes uses 0.1 kWh and costs $0.02 at $0.20/kWh. That is a calculation example, not a SaunaCloud product specification. Use the actual electrical input for your configuration, including its power supply.

SaunaCloud's red light infrared saunas integrate red and near-infrared LEDs into the bench, with controls that let you use heat and red light separately or together. Your energy estimate should reflect which functions you run and for how long.

Don't substitute LED count, advertised optical output, or irradiance at the skin for electrical input wattage. Those measurements describe different things. Also avoid adding red light consumption twice if your whole-system meter reading already includes it.

How to lower your sauna's electricity use

The most useful changes depend on where your electricity is going. Start with your actual routine:

1. Avoid unnecessary idle time. Preheat according to the equipment guidance and your preferred conditions, then switch the system off when you're finished.
2. Group household use together. Consecutive uses can reduce repeated cold starts.
3. Keep the cabin in good condition. Follow the manufacturer's guidance for the door, enclosure, insulation, and ventilation. Don't block required vents to retain heat.
4. Check your tariff. If your utility offers time-of-use billing, shifting a session can lower its cost without changing the kWh consumed.
5. Plan for the installation environment. Discuss cold rooms and outdoor exposure before choosing the system.

There isn't a universal percentage saving for these changes. Meter readings can show which ones matter in your home.

When a higher bill needs investigation

If consumption rises under similar conditions, compare warm-up time, settings, room temperature, accessory use, and electricity rates before assuming a fault.

Continuous heater operation alone doesn't prove a malfunction. It may reflect the system's control design or the heating demand. If performance changes unexpectedly, the cabin struggles to reach its normal temperature, or an electrical fault appears, contact the manufacturer and arrange qualified service as needed.

What to ask for when comparing energy-efficiency claims

Ask for the complete system's input wattage and any measured energy-use data. A useful test states the room's starting temperature, target setting, warm-up duration, occupied time, and which accessories were operating.

Electrical safety certification, quality-management certification, and measured energy efficiency answer different questions. None should be used as a substitute for the kWh needed to run the sauna in conditions that resemble yours.

For a custom build, ask how heater placement and the room's construction support comfortable use at the planned seating positions. Lower nameplate wattage by itself doesn't establish a better design.

Infrared sauna vs gym membership and rented sessions

Electricity is one part of the home-ownership calculation. Buying a sauna also involves the equipment, site preparation, electrical work, installation, and future maintenance.

Compare those costs with what you actually spend on studio visits. If you would keep your gym membership for its other facilities, don't count the entire membership fee as a saving from buying a home sauna.

A practical calculation is:

Annual net saving = studio fees you would avoid − annual home operating and maintenance costs.

Divide the installed purchase cost by that annual saving for a simple payback estimate. It won't account for financing or every future repair, but it is more informative than comparing studio admission with electricity alone. Our guide to studio sessions versus owning an infrared sauna explores that decision in more detail.

Beyond electricity: EMF, materials, and serviceability

A low running cost doesn't answer every buying question. You still need a cabin that suits the room, feels comfortable to use, and can be maintained over time.

How to assess low-EMF claims

Ask what was measured, where the meter was placed, which equipment was operating, and whether the report covers an individual component or the assembled system. Magnetic fields, electric fields, and radio-frequency measurements are different; one number doesn't describe all three.

A low-EMF claim doesn't establish energy efficiency. Treat the electricity estimate and the measurement report as separate parts of your evaluation.

Wood, construction, and future repairs

Ask about the materials used throughout the cabin, including adhesives, finishes, and hidden components. If you are sensitive to wood aromas or other materials, discuss that before ordering rather than relying on a broad "hypoallergenic" label.

For sustainability claims, request documentation for the wood actually supplied. For maintenance, find out how heaters, controls, power supplies, and red light components can be accessed and replaced, and which costs the warranty covers.

These details affect ownership costs even when the monthly electricity bill is modest.

Sauna blankets and portable saunas: calculate them separately

Portable enclosures and blankets vary in construction and electrical input. Check the product's specifications rather than assuming every portable format uses less energy than every cabin.

For illustration, a 500-watt device operating continuously for one hour consumes 0.5 kWh and costs $0.10 at $0.20/kWh. A 1,200-watt device operating for the same time consumes 1.2 kWh and costs $0.24. Thermostatic control may change actual consumption.

Their lower space requirements may appeal to some buyers, but the experience differs from sitting in a cabin. Compare usable space, cleaning requirements, materials, controls, and service support alongside energy use. Follow the manufacturer's instructions for operation and care.