What it is
Heater, rocks and water: what makes a sauna traditional
A traditional sauna heats the air. An electric heater (or a wood stove, in the original Finnish form) warms a bed of rocks, the rocks warm the room to somewhere between 150°F and 195°F, and you sit on a wood bench in hot, dry air until you sweat. Ladle water onto the rocks and the room fills with a short burst of steam that makes the same temperature feel much hotter; let the rocks run dry and it is a dry sauna. "Dry sauna", "steam sauna" and "Finnish sauna" all describe this one cabin used in slightly different ways, which is why Medical Sauna calls its line "Traditional Steam Sauna". This is the sauna you know from a gym or a hotel, brought home as a kit.
The other kind of home sauna, infrared, does not heat the air much at all; its panels warm you directly at 110°F to 150°F, with no rocks and no steam. The two are compared below.
The heater
Traditional heaters are rated in kilowatts, and the right size depends on the cabin's volume: roughly 1 kW per 45 to 50 cubic feet of room, so a two-person cabin runs a 4 to 4.5 kW heater and a four-person cabin 6 kW or more. That rating is why every traditional sauna, including all three here, needs its own 220 V circuit rather than a wall outlet. The heater ships with the cabin and controls are built in; we do not sell sauna heaters on their own. We are confirming the heater rating, rock quantity and rated maximum temperature for each of our three cabins with Medical Sauna and will add them to the table.