The sauna heater is the heart of the traditional Finnish steam sauna, providing comforting heat and ample steam when pouring water on the sauna rocks. Most sauna heaters can be used dry or for traditional steam sauna, just pour a ladle of water every 3 to 5 minutes to produce steam and bring the humidity level to your preference. Eucalyptus sauna oils can be diluted in a sauna water bucket for a refreshing vaporized scent.