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I bought a vent free 18,000 BTU wall heater from home depot and after 3 weeks, I had grey blinds and grey/black walls. Why would there be any sooting? It's a natural gas, vent-free heater in a 4 season room!
Sooting can occur when there is incomplete combustion. You can try checking the gas pressure to the unit or if there is enough fresh air for combustion.
Will the Empire RH 65LP operate at high altitude? My cabin is at 8700 ft.
Thanks for your patience. I've confirmed with the manufacturer that this furnace can indeed be used at your altitude. Because of the altitude, though, de-rating of the unit will be necessary. Empire does make a kit (part number P8644) that would properly derate the furnace for altitudes of 8,000 to 10,000 ft. Please remember that derating this unit for your altitude will decrease the BTU output by about 30%.
Are vent free propane heaters legal in my location; or, do all heaters have to be vented?
I am unaware of your state, Montana, having any ban on ventless hearth systems, but this does not mean that your municipality allows them. I recommend contacting your local code office to confirm that ventless systems are allowed prior to ordering.