Traditional saunas heat the air with an electric or wood-burning stove and a bed of rocks, letting bathers control humidity by ladling water for löyly (steam). They run hotter than infrared cabins and typically require dedicated electrical service or a flue for wood models — a bigger installation commitment than a plug-and-play infrared cabin, but the closer experience to a classic Finnish sauna.
Indoor cabins are usually simpler to plan around (moisture-tolerant flooring, a hardwired electric circuit), while outdoor barrel and cabin-style units add weatherproofing to the list and, for wood-fired models, sidestep the indoor flue and building-code questions entirely. Some cabins ship with the heater included; others — particularly barrel saunas — sell the heater separately, which changes the real total cost.
We evaluate heater output relative to cabin volume, insulation and rock-bed quality, wood species, and warranty terms — including whether the heater is covered under the same term as the cabin structure — across the top indoor and outdoor traditional sauna kits. See our Best Traditional Saunas Buying Guide and comparison for the full breakdown.
