A dry sauna is heated to temperatures of 175 to 200 degrees Fahrenheit, which is considerably hotter than a steam sauna. Dry saunas are made of wood, and are heated by pouring water over hot rocks. A bit of steam escapes through this process, but it is minimal and dissipates quickly.
Steam saunas -- sometimes called steam rooms -- contain tiled surfaces to retain moisture. Steam generators heat them to about 100 degrees Fahrenheit; steam saunas cannot be as hot as dry saunas, as the humidity created by a steam room could scald the skin.
Despite their differences, both saunas and steam rooms are said to remove toxins from the body, treat respiratory illnesses, relieve body aches and provide therapeutic relaxation.