I purchased the heater, the electrician connected it, I placed lava rocks between the heating elements and turned it on. it heated the Sauna room (270 square cubics) up to 95C or 203F in about 45 min. which is very good.the only problem I experience is the thin smoke is coming from elements. it doesn't go away so far, I ran the unit for 3 hours each day for 3 days. Will run it for about 10 hours and will see what happens.Did anyone had the same problem?