What Is a Steam Room, and How Is It Different From a Sauna?
Published
Summary
A steam room is an enclosed wet space filled with hot vapor from a steam generator. A traditional sauna is an insulated hot room heated by an electric or wood-burning heater and normally finished with wood. For a homeowner, the bigger difference is the construction behind the surfaces: steam needs a sealed, steam-suitable wet-area assembly, while sauna construction centers on high heat, insulation, ventilation, and heater clearances.
A steam room is built to contain vapor
The generator sits outside the enclosure, boils water, and sends steam through a dedicated line to a steam head inside the room.
Because the vapor has to stay inside long enough for the system to work, the walls, ceiling, door, penetrations, and waterproofing all have to be designed for repeated steam exposure. MrSteam's planning guide says the shower must be enclosed, insulated, and sealed, any windows should be double-paned, nothing for heating, venting, or air conditioning goes inside, and light fixtures must be vapor-sealed.
A sauna handles moisture differently
A traditional sauna is primarily a high-temperature room. Properly designed heaters with sauna stones may be used with small amounts of water, but the room is not intended to stay at near-saturated humidity. ThermaSol, which sells both, describes its saunas as running up to 190 degrees at 10 to 20% humidity.
Its wall construction, ventilation, and materials are designed for repeated heating and drying rather than continuous wet-room conditions.
The hidden assembly matters more than the finish
Tile can make a room look waterproof without telling you whether the membrane behind it is suitable for steam. Wood can make a sauna look simple even though the heater, sensor, clearances, insulation, and ventilation behind the finish are doing most of the technical work.
Use the U.S. terms when you shop
For a bathroom filled with warm vapor, the U.S. terms are 'steam room,' 'steam shower,' and 'steam generator.' Those are the words MrSteam and ThermaSol use in their planning guides and installation manuals.
Sources
Specifications, prices and installation requirements are as the makers published them on these pages on the date above and can change. Check the current manual and the retailer before you buy.