Sauna vs Steam Room: Heat, Humidity, Cost and Which to Pick

Sauna vs Steam Room: Heat, Humidity, Cost and Which to Pick

The main difference between a sauna and a steam room is moisture: a sauna uses dry heat from a heater and hot stones at a high temperature, while a steam room fills a sealed, tiled space with steam at a much lower temperature. WebMD puts typical saunas at around 160 to 220°F (71 to 104°C) and steam rooms at around 110 to 120°F (43 to 49°C), yet the steam room can feel just as intense because the air is wet.

This guide compares heat, humidity, construction and cost, then helps you pick the right one for your home. If you are leaning toward a sauna, also see our guides to dry vs. wet saunas and infrared vs. traditional saunas.

Sauna vs steam room at a glance

Sauna (traditional) Steam room
Heat source Electric or wood-burning heater with stones Steam generator piping steam into the room
Typical temperature Around 160–220°F (71–104°C) per WebMD; our Golden Designs Kuusamo lists 175–190°F (79–88°C) Around 110–120°F (43–49°C) per WebMD; Harvia recommends 113–122°F (45–50°C)
Humidity Mostly dry; rises briefly when you ladle water on the stones (löyly) Saturated with steam, so you see fog and condensation
Interior Wood-lined, insulated walls and benches Tile or other waterproof surfaces; Harvia says no wood inside
Special build needs Heater circuit, vents, wood paneling Full waterproofing, sloped ceiling, floor drain, generator nearby
Entry price in our catalog Indoor traditional cabins such as the African Pine at $3,126.95; wood-fired tents from $599 (tent only) Portable steam saunas from $119; 7.5 kW steam generator $231.03 (room build extra)

Heat: how each one warms you

A traditional sauna heats the air. An electric or wood-burning stove warms a basket of rocks, and the rocks radiate heat into a wood-lined room. Harvard Health describes sauna dry heat that "can get as high as 185°F" (85°C). Because the air is dry, sweat evaporates off your skin, which is why many people tolerate the higher reading.

A steam room works the other way around. A steam generator boils water and pipes the vapor into a sealed room. Harvia, the Finnish heater manufacturer, says the ideal steam room temperature is 45–50°C (113–122°F). That is far cooler than a sauna on paper, but sweat cannot evaporate in saturated air, so the heat feels heavy and wet.

Infrared saunas are a third option. They warm your body with heater panels instead of heating the air with stones, and they run cooler. Many of the infrared cabins we carry list a maximum around 140–149°F (60–65°C); the European Aspen Far Infrared Sauna Room, for example, lists 140°F (60°C). See how hot is a sauna for a full temperature breakdown.

Humidity: dry heat vs wet heat

Humidity is the real dividing line. A sauna stays fairly dry until you throw water on the stones; that burst of steam, called löyly in Finnish, raises the humidity for a few minutes and makes the room feel hotter. A Harvia Labs study of 50 adults in electric, gas, hydrogen and wood-burning saunas set to about 75°C (167°F) measured relative humidity averaging about 41%, ranging from near-dry to steam-heavy sessions. The same study found that higher humidity made the sauna feel hotter at the same temperature reading and raised heart rate.

A steam room, by design, keeps the air full of moisture the whole session. There is no "dry" setting; the generator keeps topping up the steam as it condenses on the walls.

So if you love the ritual of ladling water and controlling the steam yourself, a sauna gives you both: dry heat most of the time and wet bursts when you want them. If you want soft, humid heat without the high temperature, a steam room is the closer fit.

How they're built

Sauna construction

A sauna is an insulated, wood-paneled room with tiered benches and a heater. Harvia's KIP heater manual lists a minimum room height of 75 in (1,900 mm) in the USA for its smallest KIP-30 model and recommends a ceiling no higher than 7 ft (2,100 mm), plus a supply vent near the floor by the heater and an exhaust vent on the opposite wall. Electric heaters need the right circuit: our Golden Designs Kuusamo specifies an 8.0 kW Harvia stove on 240V/40A, while compact rooms can use something like the 2 kW 120V sauna heater ($154.58), rated for 52.9–88.2 cu ft (1.5–2.5 m³) rooms. For sizing, use our sauna heater size calculator.

Steam room construction

A steam room is a wet room. According to Harvia's steam room guide:

  • The ceiling must be curved or mono-pitch with an angle of at least 15 degrees, so condensation runs down the walls instead of dripping on you.
  • The room needs a floor drain, or the floor must slope toward a drain.
  • All waterproofing materials and tile adhesive should withstand 80°C (176°F); porous natural stone should be avoided.
  • Wood is not used inside a steam room.
  • The steam generator sits in a dry, ventilated spot at the same level as the room, ideally within 6 m (about 20 ft) and no further than 10 m (about 33 ft).

In practice this means a steam room is usually built into a bathroom or shower enclosure by a contractor, while a sauna can arrive as a prefab kit you assemble.

Cost at home

For a built-in steam room, the equipment can be the cheap part. A 7.5 kW steam generator with controller is $231.03 in our catalog, but the tiled, waterproofed, drained enclosure around it is a remodeling project, and its price depends on your contractor and finishes.

For a sauna, the price is mostly the cabin. Prices from our catalog:

If you want steam without a remodel, a portable steam sauna is the low-cost route: the Portable Steam Sauna Box with Steamer is $119 and measures 32 x 32 x 71 in (81 x 81 x 180 cm), and the Blisspod Portable Steam Sauna with a 1600W steamer is $229. Browse the full range in portable steam saunas. For a deeper look at sauna budgets, read how much does a sauna cost.

A note on "steam sauna" product names

You will see many products called "steam saunas" that are actually traditional saunas. The Personal Home Steam Sauna – Traditional 5 and the Blisspod Prague Outdoor Barrel Steam Sauna both use a heater and stones (the Prague lists a 6000 W heater and a 0–90°C range). The "steam" refers to the löyly you create by pouring water on the rocks, not to a steam generator. A true steam room is a sealed wet room fed by a generator. Portable steam tents sit in between: they use a small steamer inside a fabric enclosure.

Which should you pick?

Choose a sauna if you want:

  • Higher, drier heat with the option to add steam on demand
  • A freestanding kit indoors or in the backyard, with no plumbing
  • Wood interiors and a traditional Finnish experience

Start with our home saunas, traditional saunas or outdoor saunas.

Choose a steam room if you want:

  • Lower temperatures with humid, enveloping heat
  • A space that doubles as a shower and can be fully tiled
  • Willingness to plan waterproofing, a drain and a sloped ceiling

Not ready to build? A portable steam sauna lets you try humid heat for a fraction of the cost.

Safety basics for both

Harvard Health advises staying no more than 15–20 minutes in a sauna, avoiding alcohol, cooling down gradually and drinking water afterward, and leaving right away if you feel unwell. WebMD suggests limiting steam room sessions to 5 to 10 minutes and leaving immediately if you feel dizzy, short of breath or have chest tightness. Both sources say people with heart disease or blood pressure problems should check with a doctor first.

Talk to your doctor before using a sauna or steam room if you have a heart condition or are pregnant.

FAQ

Is a sauna or steam room hotter?

A sauna is hotter by thermometer. WebMD lists saunas at around 160–220°F (71–104°C) and steam rooms at around 110–120°F (43–49°C). A steam room can still feel intense because humid air stops sweat from evaporating.

Can I turn a sauna into a steam room?

Not really. Saunas are wood-lined, while Harvia says steam rooms should have no wood inside and need full waterproofing, a sloped ceiling and a floor drain. You can add humidity to a sauna by ladling water on the stones.

Which is cheaper to add at home?

A portable steam sauna is the cheapest entry, from $119 in our catalog. Among permanent options, a sauna kit is usually simpler, since a steam room requires a tiled, waterproofed and drained room around the generator.

Does a steam room need a drain?

Yes. Harvia's guidance says a steam room must have a floor drain, or the floor must slope across the whole room toward a drain.

Is a steam sauna the same as a steam room?

Usually not. Many products named "steam sauna" are traditional heater-and-stone saunas where you make steam by pouring water on the rocks. A steam room uses a steam generator in a sealed wet room.

How long should I stay in a sauna or steam room?

Harvard Health suggests no more than 15–20 minutes in a sauna, and WebMD suggests 5–10 minutes in a steam room. Leave sooner if you feel unwell.

Sources: WebMD, "Health Benefits of Steam Rooms"; Harvard Health Publishing, "Saunas and your health"; Harvia, "How to build a steam room"; Harvia Labs, humidity study summary; Harvia KIP heater installation manual (USA/Canada). Product specs and prices are from our catalog listings.

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