Sauna Electrical Requirements: 120V vs 240V, Amps and Running Costs

Before you pick a model, check the power. Sauna electrical requirements decide whether a sauna plugs into the wall tonight or needs an electrician, a new breaker and a permit first. Small infrared saunas run on a standard 120V household outlet, mid-size infrared cabins need their own dedicated 120V circuit, and traditional saunas with electric heaters generally need a dedicated 220–240V circuit. This guide shows the exact requirement for every SunRay sauna we carry, how to read amp draw, and what a session costs to run.

As a trainer I see the same mistake over and over: someone buys the sauna first and calls the electrician second. Do it the other way around and you will know your real budget before you order.

Sauna Electrical Requirements: The Short Answer

Plug-in (standard 120V outlet): compact far-infrared saunas such as the SunRay Sedona 1-2 person ($2,798), SunRay Evansport ($2,698) and SunRay Sierra ($2,998). No electrician needed in most homes.

Dedicated 120V circuit: 3- and 4-person infrared cabins such as the SunRay Aspen ($3,296) and SunRay Sequoia ($4,298) need their own 110–120V outlet, typically on a 20 amp circuit that nothing else shares.

Dedicated 220–240V circuit: every SunRay traditional sauna — from the SunRay Baldwin ($3,496) to the SunRay Galaxie ($5,698) — plus larger outdoor infrared models like the SunRay Pacific ($5,190). These must be wired by a licensed electrician.

Sauna Electrical Requirements by Model

*Cost at full rated power using 18.2¢ per kWh, the U.S. Energy Information Administration's 2026 average residential electricity price forecast. Heaters cycle on and off once the room is up to temperature, so a real session usually costs less than the full-power figure. Your local rate may be higher or lower.

120V Plug-In Infrared Saunas

A standard household circuit is 120V, and most are 15 or 20 amps. The SunRay Sedona draws 1,290 watts — about 10.8 amps at 120V — and the Evansport and Sierra draw 1,665 watts, about 13.9 amps. That fits a normal outlet, but it is most of the circuit's capacity, so avoid sharing that circuit with a space heater, hair dryer or treadmill while the sauna runs.

Do not use an extension cord. Plug the sauna straight into a properly grounded wall outlet.

Dedicated 120V, 20 Amp Circuits for Larger Infrared Saunas

Once you reach 3- and 4-person cabins, the draw climbs to 1,965 watts–2,100 watts (16.4–17.5 amps at 120V). SunRay specifies a dedicated 110–120V outlet for these models — the SunRay Savannah, Aspen, Sequoia and Bristol Bay corner — and the outdoor Burlington, Grandby and Cayenne. "Dedicated" means the outlet is the only thing on that breaker.

Adding a dedicated 120V circuit is usually a modest job if your panel has a free slot and the sauna sits near it. Ask your electrician to quote it before you order.

240V Sauna Requirements for Traditional Saunas

Traditional saunas heat the air with an electric heater and stones, and those heaters are rated in kilowatts. SunRay's traditional rooms use Harvia heaters from 3.5kW to 8kW: the Baldwin lists 220V on a 20 amp circuit, the Aston and Hampton list 240V on a 30 amp circuit, and the SunRay Charleston with its 8kW heater lists 220V on a 40 amp circuit. Outdoor traditional models such as the SunRay Cayman list 220V at 40 amps.

Some infrared models also need 240V: the outdoor SunRay Logan and Pacific specify a dedicated 220–240V outlet. Electric barrel saunas, such as the SunRay and Golden Designs barrels, also run on 220–240V — see our barrel sauna buying guide for the full barrel lineup.

How to Calculate a Sauna's Amp Draw

The math is simple: amps = watts ÷ volts. A 4,500-watt heater on 240V draws 18.75 amps; a 6,000-watt heater draws 25 amps; an 8,000-watt heater draws about 33 amps. That is why the circuits manufacturers specify are larger than the running draw — breakers and wire are sized with headroom for a heater that runs for long periods. Always use the circuit size in the manufacturer's spec and let your electrician confirm it against local code.

What a Sauna Costs to Run

At 18.2¢ per kWh, an hour at full power costs about $0.38 for the 2,100-watt Sequoia, about $1.09 for a 6kW traditional room like the Hampton, and about $1.46 for the 8kW Charleston. Traditional saunas also need a preheat period, while infrared cabins are usable sooner, so infrared is usually the cheaper option to run. For the full purchase-plus-running picture, read how much a home sauna costs.

Permits, Electricians and Outdoor Power

Hire a licensed electrician for any new circuit, and expect that a new circuit usually needs an electrical permit — check with your local building department. Bring the sauna's spec sheet so the electrician sizes the breaker and wire exactly to the manufacturer's requirement.

Outdoor saunas add a trench or conduit run from the house. The longer the run, the higher the cost and the more important correct wire sizing becomes, so place an outdoor sauna as close to your panel as the yard allows. Our indoor vs outdoor sauna guide covers placement in more detail.

Sauna Electrical Checklist Before You Order

1. Pick the size and heat type first. Capacity and infrared vs traditional decide the power requirement — use the table above.

2. Look at your panel. Note whether there is a free slot for a new breaker, and what else already runs on the circuit nearest the sauna location.

3. Get an electrician's quote with the spec sheet in hand. Give them the exact voltage and circuit size from the product page, plus the distance from the panel to the sauna.

4. Ask about the permit. Your electrician will know whether your town requires one for the new circuit.

5. Schedule the wiring before delivery. Freight deliveries arrive curbside; having the circuit ready means the sauna can be assembled and running the same weekend.

If the electrical quote changes your budget, consider a plug-in model: the SunRay Evansport at $2,698 needs nothing but a standard outlet, while a 3-person cabin like the SunRay Savannah ($3,496) only needs a dedicated 120V outlet rather than a 240V run.

Sauna Electrical Requirements FAQ

Can I plug a sauna into a regular outlet? Only the compact infrared models built for it — like the SunRay Sedona, Evansport and Sierra. Larger infrared cabins need a dedicated circuit, and SunRay's traditional saunas need 220–240V.

Do infrared saunas need 240V? Most indoor infrared saunas run on 120V. Larger outdoor infrared models, such as the SunRay Logan and Pacific, specify 220–240V.

Does a traditional sauna need 240V? Every SunRay traditional sauna lists a 220–240V circuit. A wood-burning stove, offered on some barrel saunas, needs no electrical service at all.

How many amps does a sauna use? Divide the rated watts by the voltage: a 1,665-watt infrared sauna draws about 14 amps at 120V, and a 6kW traditional heater draws 25 amps at 240V.

Shop Saunas by Power Requirement

Compare every model and its electrical spec in our SunRay sauna collection, browse all infrared saunas and traditional saunas, or see the full sauna collection. Need help matching a sauna to your panel? Email support@peakflowfitness.com or call 646-921-5221.

Related reading: Which Sauna Should I Get? · Traditional vs Infrared Sauna · Indoor vs Outdoor Sauna · Barrel Sauna Buying Guide