I am heating an outdoor 4x6 sauna with 7 foot ceiling and can get it to at higher than 160 degrees which is as high as my thermometer goes. If you are building a new sauna make sure you insulate the crap out of it. I used 2 layers of polyurethane foam with the inner layer being foil faced for a vapor barrier then the cedar on top of that. Like all the other reviews say- make sure to use a 20 amp breaker with a 20 amp gfi and 12 gauge or bigger wiring. Lava rocks work the best with this heater. We tried other saina rocks first but lava rocks hold more water for steam. If you’re reading this and are in the market for a heater I highly recommend this one. I

I have purchases several units and have had no complaints, only more order.

Works great in small environments