Let me clear the steam on this one. "Wet sauna vs. dry sauna" is the most confusing phrase in the hot-room world, and the whole problem is a name. A "wet sauna" is a steam room. And a steam room isn't a sauna.

Search it and page after page admits a wet sauna is really a steam room, then keeps calling it a wet sauna anyway. I'm going to explain the difference, then retire the name.

What is a wet sauna? It's a steam room

The difference is how the heat gets made.

A sauna runs on a stove. Wood or electric, it heats a load of rocks, and the rocks heat the room. 160–195°F, low humidity.

A steam room runs on a water line. A generator boils water and pumps vapor into a sealed, tiled room. About 120°F max, close to 100% humidity.

Is a sauna with steam a wet sauna? No

Ladle water on the rocks and a wave of steam rolls over the bench. That's still a dry sauna, doing exactly what it's built to do. The Finns call that wave löyly. It hits, peaks, and fades as the stove dries the air back out.

No water line feeds the heater. You decide when water hits the rocks and how much. A steam room never gives that choice. It's wet all the time, by design.

Steam room vs. sauna temperature: why 120°F feels hotter than 180°F

The body cools itself when sweat evaporates. In a sauna, sweat evaporates off the skin and carries heat away, so the body handles serious heat for a long session.

In a steam room the air is already full of water. Sweat can't evaporate. It just drips. Steam condenses on the skin too, so a lot of that "sweat" isn't even yours. With the cooling system shut down, 120°F feels like a lot more.

Breathing in a steam room vs. a dry sauna

Steam room air is thick, like breathing through a warm towel. Sessions are short. In, soaked, out.

Sauna air is hot but light. Breathe easy, talk with whoever's on the bench, and stay long enough for the heat to work. Want intensity, throw water. Want to sit and think, leave the ladle alone. That control is why people come back to the sauna every day.

Let's retire the name "wet sauna"

"Wet sauna" is a bad name for a steam room, and it's time to stop using it. Call a steam room a steam room. Call a sauna a sauna. The confusion clears right up.

Every Nightjar is a traditional dry sauna, built for outdoors, with a stove and a pile of rocks waiting for the ladle. For where that löyly lands best, read why every Nightjar gets a triple bench.

Wet sauna vs. dry sauna FAQ

Is a wet sauna the same as a steam room?
Yes. "Wet sauna" means a steam room: a sealed room filled with vapor from a steam generator.

Is a steam room a sauna?
No. A sauna heats the room with a stove and rocks. A steam room heats it with boiling water.

If I pour water on the rocks, is it a wet sauna?
No. That's löyly, part of every traditional dry sauna. The humidity fades as the stove dries the air back out.

What temperature is a wet sauna?
A steam room tops out around 120°F at close to 100% humidity. A dry sauna runs 160–195°F.

Why does a steam room feel hotter than a sauna?
Sweat can't evaporate in saturated air, so it can't cool the body. 120°F of steam feels hotter than it reads.