What does an electric sauna heater cost to run?

Run the numbers on your own use

Change any of these and the figures update. The defaults are the typical case described above; your rate is the input that moves the answer most.

Why this is lower than the number you will see elsewhere

Almost every published answer to this question multiplies the rating on the label by the hours the appliance is switched on. For an electric sauna heater that gives 900 kWh a year, or $165.

Full draw during the 30–45 minute heat-up, then cycling to hold temperature for the session.

The arithmetic, step by step

Nothing here is hidden, so you can check it or change it. Working in the order the formula runs:

1. 6,000 W — what it draws while it is actually drawing. This is the rating on the plate.
2. × 55% — the share of its in-service time it is really pulling that. Full draw during the 30–45 minute heat-up, then cycling to hold temperature for the session.
   That gives 3300 W averaged across the hours it is on.
3. × 1.5 hours a day × 100 days — A 4–6 person home sauna, used a couple of times a week.
   3300 × 1.5 × 100 ÷ 1,000 = 495 kWh a year.
4. + standby — 2 W for the other 22.5 hours a day, which is 4.5 kWh a year. People leave this out and it is not always small.
5. × 18.34¢ — the US average residential rate for June 2026.
   500 kWh × 18.34¢ = $92 a year.

Change any assumption in the calculator above and every figure on this page moves with it. The two that matter most are your rate, which varies 4× across the country, and the hours — the duty cycle is a property of the appliance, but the hours are a property of you.

How sensitive is that number?

A single figure invites more confidence than it deserves. Here is the same appliance under assumptions either side of the default, so you can see how much of the answer is the appliance and how much is the guess about how you use it.

Everything else held at the default. The spread here is the honest error bar on the headline figure.

What it costs per hour, day and month

At 18.34¢ per kWh, the US residential average for June 2026.

The thing worth knowing

The heat-up is most of the cost, which makes session length almost free and frequency expensive. Two thirty-minute sessions on different days cost far more than one hour-long session, because you pay for the climb twice. This is the opposite of the intuition most people have about it.

What it costs in your state

The appliance is the same everywhere; the rate is not. Running this electric sauna heater costs $263 a year in Hawaii and $65 in Nevada — a difference of 4×.

Cost of running one electric sauna heater for a year, by state. Residential average price, EIA June 2026.

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Questions

Source: U.S. Energy Information Administration, Electric Power Monthly, Table 5.6.A, June 2026. U.S. Government work, public domain.

How every figure on this page is computed · Where the data comes from