How much does a sauna cost to run?

Heater power times session length times your electricity rate. A 6 kW heater for one hour at the national average of 18.16 cents per kWh costs $1.09, which is $13.08 at twelve sessions a month. Your own state's rate changes that figure more than any other input.

Does the heater draw its full rated power for the whole session?

No. It draws close to full power while heating up, then cycles on its thermostat to hold temperature, so a real session uses less than power times hours. The figures here are that ceiling rather than an average, because the ceiling is the number worth budgeting against and the cycling depends on your room and your door.

Which electricity rates are these?

The U.S. Energy Information Administration's residential rate by state for August 2026, refreshed automatically each month from the EIA source table. The national figure quoted is EIA's own U.S. total rather than an average of the state rows, which would weight a small state like a large one.

Is the running cost or the purchase price the bigger number?

The purchase price, by a wide margin, at any ordinary usage. Twelve one hour sessions a month on a 6 kW heater is a two figure monthly bill against a four figure cabinet, which is why the sizing and the price comparison decide the budget and this calculator refines it.

Sauna running cost calculator: how much electricity a sauna uses

A sauna uses up to its heater's rated power in kWh for every hour it runs: a 6 kW heater uses up to 6 kWh in a one hour session, which costs about $1.09 at the US average rate of 18.16 cents per kWh (EIA, August 2026), and heaters from 3 to 9 kW use 3 to 9 kWh, or $0.54 to $1.63 a session.

Operating cost is heater power times session length times your electricity rate. The calculator below uses your state's actual August 2026 residential rate from the U.S. Energy Information Administration; a reference table at the national average rate of 18.16 cents per kWh follows it.

Your cost

Heater power (kW)

Session length (hours)

Sessions per month

State

Cost per session: $1.09
Cost per month: $13.08

Saunas with a 4.5 to 6 kW heater, lowest verified price first

Selection rule, in full

models with a verified price whose heater is between 75 percent of the kW you entered and the kW itself, so they cost at most the figure above to run. Rows are the lowest verified prices among the models that match, ties by name; nothing is ranked on quality. Where none of them has a seller we link to, the lowest-priced matching model that has one is added as a last, labeled row.

Model	Heater and size	Verified price	Where to buy
Sunray Southport 3 Person Indoor Traditional Sauna	4.5 kW heater, 240 V, 3 person, traditional	$3,496.00at Purely Relaxation	Buy at Recovery for Athletes, $3,596.00 (opens in a new tab)
Almost Heaven Arcadia 2 Person Outdoor Barrel Sauna	6 kW heater, 240 V, 2 person, traditional	$3,499.99at Costco	Every verified seller
Sunray Aston 1-2 Person Indoor Traditional Sauna	4.5 kW heater, 2 person, traditional	$3,596.00at Recovery for Athletes	Buy at Recovery for Athletes, $3,596.00 (opens in a new tab)
Almost Heaven Logan 1 Person Indoor Sauna	6 kW heater, 240 V, 1 person, traditional	$3,885.00at Select Saunas	Buy at Select Saunas, $3,885.00 (opens in a new tab)
Sunray Tiburon 4 Person Indoor Traditional Sauna	6 kW heater, 240 V, 4 person, traditional	$3,896.00at Purely Relaxation	Buy at My Sauna World, $4,298.00 (opens in a new tab)

Each price is the lowest verified at the named seller on the date the model's own page shows. Buy links open the seller's page for that exact model and are affiliate links that support this site; see the affiliate disclosure.

Heater draw during a session cycles on and off around the set temperature, so real usage often lands somewhat below this straight-line estimate; treat it as the upper bound.

Running cost in every state, worked out already. To find the heater power your room needs first, use the sauna heater size calculator.

Common heater power at a glance

Cost per 1 hour session at the national average rate (August 2026)
Heater power	Cost per session	12 sessions per month
3 kW	$0.54	$6.54
4.5 kW	$0.82	$9.81
6 kW	$1.09	$13.08
8 kW	$1.45	$17.43
9 kW	$1.63	$19.61

Running cost questions

How much does a sauna cost to run?: Heater power times session length times your electricity rate. A 6 kW heater for one hour at the national average of 18.16 cents per kWh costs $1.09, which is $13.08 at twelve sessions a month. Your own state's rate changes that figure more than any other input.
Does the heater draw its full rated power for the whole session?: No. It draws close to full power while heating up, then cycles on its thermostat to hold temperature, so a real session uses less than power times hours. The figures here are that ceiling rather than an average, because the ceiling is the number worth budgeting against and the cycling depends on your room and your door.
Which electricity rates are these?: The U.S. Energy Information Administration's residential rate by state for August 2026, refreshed automatically each month from the EIA source table. The national figure quoted is EIA's own U.S. total rather than an average of the state rows, which would weight a small state like a large one.
Is the running cost or the purchase price the bigger number?: The purchase price, by a wide margin, at any ordinary usage. Twelve one hour sessions a month on a 6 kW heater is a two figure monthly bill against a four figure cabinet, which is why the sizing and the price comparison decide the budget and this calculator refines it.

Prices and specifications verified November 2, 2026, and re-checked weekly after that. How these numbers are checked.

Free guide: sizing and budgeting a home sauna

A fill-in worksheet covering room sizing math, the electrical checklist, indoor vs outdoor decisions, a full cost worksheet, and ten questions to ask the dealer.

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