Curved wooden interior of a barrel sauna with benches

Barrel Sauna Buying Guide: Sizes, Wood, Heaters and Foundations

A barrel sauna is an outdoor sauna built from long wooden staves curved into a cylinder, held together with steel bands and laid on its side on cradles. It's one of the most recognizable backyard sauna shapes, and one of the simplest to put up: a kit, a level base, a heater and, for electric models, an electrician.

This guide walks through sizes, wood, heaters, foundations and costs, using the real specs of the barrel saunas in our catalog. Prices for the barrel saunas we carry run from $6,999 to $16,360.

What is a barrel sauna?

The curved shape does a few practical things. There are no top corners, so the room holds less air above the benches than a box-shaped cabin of similar floor size. The round roof sheds rain and snow, and many barrels add shingles on top. And the stave construction means the walls are the structure: you're looking at the same wood inside and out.

That last point matters for heat. Most barrel saunas use solid staves as the wall, with no separate insulated cavity like a framed cabin has. The wood itself does the insulating. In very cold weather, expect a longer warm-up than a well-insulated cabin, and size the heater accordingly.

The barrel saunas we carry

Model Capacity Wood Heater Price
Golden Designs Klosters 6 person Pacific premium cedar 8.0 kW electric, up to 190°F $6,999
Blisspod Prague (two versions) 2–4 or 4–6 person Canadian red cedar 6 kW electric, 240V, 27 A $6,999–$7,999
Mr. Steam Barrel Haus kit 4 or 6 person Thermal spruce staves, thermal aspen benches 4.5, 6 or 9 kW electric, stainless steel $16,360

All three are traditional saunas with hot stones, so you can throw löyly. They're listed in our outdoor saunas collection, and the cedar models also appear under cedar saunas.

Barrel sauna sizes

Barrels are sold by length and diameter, and by how many people the benches seat. The Prague is a useful example because its listing gives full dimensions:

  • 2–4 person: 70.87" outside diameter and 70.87" long (180 × 180 × 180 cm). Inside, 67.87" across and 67.87" long.
  • 4–6 person: same diameter, 94.49" long outside (240 cm), 91.49" inside.

The extra length goes into longer benches, not more height. When you compare sizes, look at bench length and whether the benches face each other, not only the headcount. "4 person" usually means four people sitting closely.

Also check the footprint you need outside the barrel. Some designs add a porch or canopy at the front. One Prague version, for example, has two porch seats outside the door for cooling off between rounds.

Working out barrel volume

Heater sizing depends on room volume, and a barrel is a cylinder, so the formula is π × radius² × length. For the 2–4 person Prague, using the inside dimensions:

  • Radius: 67.87" ÷ 2 = about 33.9"
  • Volume: 3.1416 × 33.9 × 33.9 × 67.87 ≈ 245,500 cubic inches, or about 142 ft³
  • Its full glass back is a circle about 25 sq ft in area. Harvia's US sizing sheet adds 2 ft³ for each sq ft of glass, so about 50 ft³ more.
  • Total: about 192 ft³, or 5.4 m³. By the common rule of about 1 kW per m³, that points to a heater around 5.5 kW. The listed 6 kW heater covers it.

Use our sauna heater size calculator to run your own numbers, and see the heater sizing guide for the details.

Barrel sauna wood

The wood is the walls, the look and much of the smell, so it's worth understanding the options.

Wood Where you'll see it Notes
Red cedar Prague, Klosters Aromatic, reddish-brown, a common choice for outdoor saunas. The Prague listing calls it naturally weather-resistant when properly maintained.
Thermally modified spruce Barrel Haus staves Spruce that has been heat-treated, which darkens it. Paired with thermally modified aspen benches.
Other woods Other outdoor saunas Hemlock, spruce and thermally modified woods are common in cabins. Browse outdoor saunas to compare.

Whatever the wood, the exterior needs care. Follow the maker's advice on exterior finish, and leave the interior unfinished unless the manual says otherwise. Wood swells and shrinks with the seasons, so check that the steel bands stay snug, as the instructions describe.

Barrel sauna heaters

Electric

All the barrel saunas we carry come with electric heaters. Electric is the easy choice for a backyard close to the house: thermostat, timer, no firewood. The trade-off is wiring. The Prague's 6 kW heater lists 240V and 27 amps, and the Barrel Haus comes with a contactor box and a wall-mounted touchscreen control. Plan on a dedicated 240V circuit run to the sauna, installed by a licensed electrician who can confirm the breaker, cable size and any outdoor wiring rules. Our sauna electrical guide explains what to ask.

Wood-burning

Wood stoves are popular in barrels too, especially off-grid. They need a chimney through the barrel, clearances from the staves and benches set by the stove maker, and a check of local codes. Our wood-burning sauna stove guide covers the basics.

Barrel sauna foundations

A barrel sits on two or more curved cradles, so the load is concentrated in a few spots. The base needs to be level, firm and drained, so the cradles don't sink and water doesn't pool under the wood. Common options:

  • Concrete slab. The most solid base. Slope it slightly so water runs off.
  • Compacted gravel pad with pavers or footings under the cradles. Drains well and is easier to build.
  • Deck. Only if it's built to carry the weight. Have a contractor check it.

Weight is real. The Prague's listing gives 970 lb for the sauna itself, before benches fill with people. Before you pour or dig, check local permit, setback and HOA rules. Some places treat an outdoor sauna as an accessory structure.

Delivery, assembly and lead times

Barrel saunas ship as kits by freight. The Prague's package weighs 1,014 lb and measures about 74.8" × 74.8" × 63.6", so plan a clear path from the driveway to the site. The Barrel Haus is made to order and needs at least 4 weeks to build and ship. Most orders ship within 1–4 business days, but large saunas take longer in transit, and each listing sets its own warranty and return terms. Assembly is a two-person job at minimum.

What's included

Check the listing. The Prague includes stones, a sandglass, a hygrothermograph, a wooden bucket and scoop, and a wall lamp. The Klosters includes a sandglass, bucket and scoop. The Barrel Haus includes 50 lb of stones, a pail, ladle and thermometer/hygrometer. If yours doesn't include stones, see sauna stones.

FAQ

How much does a barrel sauna cost?

The barrel saunas in our catalog cost $6,999 to $16,360. Budget extra for a foundation, an electrician and a dedicated 240V circuit for electric models.

Are barrel saunas insulated?

Usually not in the way a framed cabin is. The solid wood staves are the wall and provide the insulation. That's why heater size matters more in cold climates.

How hot do barrel saunas get?

The Klosters lists up to 190°F with its 8 kW stove, and the Prague lists a range of 0–90°C (up to 194°F). Actual temperature depends on the heater, the weather and how long you preheat.

Can you put a barrel sauna indoors?

The ones we carry are designed for outdoor use. For indoors, look at our indoor saunas, which are built for that space and its ventilation.

Can you move a barrel sauna?

Kits can be taken apart and rebuilt, and the Prague's listing says it's easier to relocate than a built-in structure. It's still heavy, so moving it is a planned job, not an afternoon one.

Sources

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