A “sauna” (a Finnish word meaning “bath”), is a chamber that heats
occupants for the purpose of relaxation, “de-stressing”, and detoxifying
through increased circulation and perspiration.
A sauna is not to be confused with a “steam bath” which uses a steam generator to inject steam into the chamber. It is run cooler and at near 100% humidity. Traditional saunas have deep pockets of special rocks that are heated by electric heating coils or by wood-fired furnaces. The rocks serve to provide a consistent source of heat inside the chamber and to generate small amounts of steam to humidify the air. As water is sprinkled on the hot rocks, humidity is increased to about 30% to aid in perspiration.