The steam bath uses a steam generator. The sauna has very low humidity, whereas the steam bath has high humidity. In a steam bath the steam builds up to create a humidity level of around 100%. Because of the humidity factor the heat in the sauna is far higher than that of the steam bath. A Sauna is a Finnish hot air bath. The word sauna is derived from the Finnish word for dry heat bath. The terms steam bath, steam shower and steam sauna often get confused with one another, yet they do not mean the same thing. The first difference begins with how they are heated.