The short answer: a 1500 W sauna draws 1.5 kWh for every hour the element runs flat out, which at the national average residential rate of about 32 c/kWh is roughly 48 cents an hour, or about 66 cents in South Australia at 43.7 c/kWh. A realistic 55-minute session sits under that, because the thermostat cycles the element off once the space is at temperature.

That is the whole calculation, and it is worth doing yourself rather than trusting a number on a product page. Below is the arithmetic with every step shown, the current Australian tariffs it rests on, and what the same maths does to a cabin stove.

The arithmetic, step by step

Electricity is billed per kilowatt-hour: one kilowatt of draw, sustained for one hour. So the conversion is trivial once you have the wattage.

Step one. 1500 watts is 1.5 kilowatts.

Step two. Run it for one hour at full draw and you have used 1.5 kWh.

Step three. Multiply by your rate. Finder put the national average residential usage rate at about 32 c/kWh (updated 2 September 2026), so 1.5 × $0.32 = 48 cents. Canstar Blue put the national range at 24 to 45 c/kWh and the South Australian average at 43.7 c/kWh, the highest of any state (May 2026), so an Adelaide household calculates 1.5 × $0.437 = 66 cents.

That is the ceiling rather than the expectation, and the distinction matters.

Why real sessions cost less than the ceiling

A sauna heater is thermostatically controlled. It draws full power while the space is climbing to temperature, then cycles on and off to hold it, running perhaps a third to a half of the time depending on how well the enclosure holds heat and how cold the room is. Continuous full draw only happens during heat-up.

So a typical session breaks into two phases. Roughly 25 minutes of heat-up at close to full draw, then a 30-minute sitting at partial duty. Fifty-five minutes at full draw would be 1.375 kWh, which is 44 cents nationally and 60 cents in South Australia. Actual use lands below both, and I am deliberately quoting the worst case because a figure you cannot be disappointed by is more useful than an optimistic average.

We have not metered our own unit over a session and published the reading, so every figure on this page is calculated from the rated wattage rather than measured. That is an honest calculation, not a test result, and the two deserve different levels of trust.

What that means per week and per year

Under $125 a year in the most expensive state in the country, at a four-times-weekly habit, on the worst-case assumption. That is the number most people are surprised by, and it is surprising in the direction of cheaper.

Is that a lot, compared to what else is plugged in?

A 1500 W element is in the same class as household appliances you already run without thinking about it. A plug-in fan heater on high commonly draws 2000 to 2400 W, so an hour of sauna uses less electricity than an hour of room heating at full blast. An electric kettle draws around 2200 W but only for two or three minutes, which works out at roughly 0.11 kWh a boil, so a full sauna session is about twelve cups of tea.

Framed that way, the running cost is not the thing to agonise over when buying a sauna. The purchase price is.

How a cabin compares

Run the same three steps on a traditional cabin stove and the picture changes by an order of magnitude, because the wattage does.

Australian traditional cabins use Harvia stoves rated 3.5 to 4.5 kW for two-person models and 4.5 to 9 kW for larger ones (Revel and Kiva listings, September 2026). Take a 6 kW stove and a 75-minute session including a longer pre-heat: 6 × 1.25 = 7.5 kWh, which is $2.40 nationally and $3.28 in South Australia. Four sessions a week for a year comes to roughly $682 in Adelaide against $125 for the portable.

Neither is frightening. The gap is worth knowing before you assume the cheaper unit is also the cheaper one to own, and it runs the same way as the purchase price rather than against it.

Infrared cabins sit in between, drawing roughly 1.6 to 3.5 kW on Australian listings. Our full cost comparison across every sauna type is in what it costs to run a sauna in Australia.

Why 1500 W is the number, not a compromise

There is a hard ceiling on what a portable can draw, and it is set by the wall socket rather than by design ambition. A standard Australian 10 A power point supplies 10 amps at a nominal 230 V, which is 2,300 W, and plenty of sources still quote 2,400 W from the legacy 240 V supply. Either way, a 1500 W element sits comfortably inside it with headroom, which is why a portable dry-heat sauna runs off an ordinary power point with no electrician involved.

A 6 kW cabin stove cannot. It needs a hardwired dedicated circuit installed by a licensed electrician, which is a real cost on top of the purchase and is covered in do you need a dedicated circuit for a sauna. That single constraint, the 10 A socket, is what shapes the entire portable category.

Frequently asked questions

How much power does a 1500W sauna use per session?

Up to 1.38 kWh for a 55-minute session, assuming the element runs at full draw throughout. Real use is lower because the thermostat cycles the heater once the space reaches temperature, typically running it a third to a half of the time during the sitting phase rather than continuously.

How much does a sauna session cost in electricity?

About 44 cents at the national average of 32 c/kWh (Finder, September 2026) and about 60 cents in South Australia at 43.7 c/kWh (Canstar Blue, May 2026), for a 1500 W portable. Those are worst-case figures assuming continuous full draw, so actual cost sits below them.

Does a sauna use more power than a heater?

A 1500 W sauna uses less per hour than a typical plug-in fan heater, which commonly draws 2000 to 2400 W on its high setting. It uses more than an electric kettle per session, though a kettle only runs for two or three minutes. One sauna session is roughly twelve kettle boils.

Do saunas draw full wattage the whole time?

No. The element runs at full draw while the space climbs to temperature, then the thermostat cycles it on and off to hold that temperature. Continuous full draw applies only during heat-up, which is why quoted hourly figures are ceilings rather than typical consumption.

Is 1500W enough for a real sauna?

For a one-person insulated enclosure, yes: 1500 W reaches 85°C, which sits inside the traditional Finnish band. It is not enough for a multi-person cabin, where stoves run 3.5 to 9 kW. Enclosure size and insulation decide what a given wattage can achieve.

How do I work out my own sauna running cost?

Find the appliance wattage, divide by 1000 for kilowatts, multiply by hours of use, then multiply by the usage rate on your electricity bill in cents per kWh. For a 1500 W unit run one hour at 30 c/kWh that is 1.5 × $0.30, or 45 cents.

What this means if you are choosing a sauna

Running cost is rarely the deciding factor, and the arithmetic above is why: even at Australia's highest state average, four sessions a week for a year lands around $125 for a 1500 W portable. Where the wattage genuinely decides something is the power point. At 1500 W the Kiuas Dry Sauna runs from a standard Australian socket with no electrician, and that is the practical reason the category exists.

Specifications are on the Kiuas Dry Sauna product page.

Related reading

• How much does it cost to run a sauna in Australia?
• How long does the Kiuas Dry Sauna take to reach 85°C?
• Do you need a dedicated circuit for a sauna?
• Best affordable saunas in Australia