It got cold here last week so I thought it was a good time to test my heat using propane. The Alde worked just fine. Took about an hour to heat from 25 degrees ambient temp to 72 degrees inside temp. I never heard as much noise from the Alde as some here have indicated. As a matter of fact, the only way I could really tell that the Alde was working was to check the exhaust port for warm air.
However, after I shut everything down I noticed that the exhaust port was covered with black soot. This indicates incomplete combustion, no? Have any of you noticed this? Is there some adjustment I need to make to the Alde heater? I am at about 1700 feet above sea level so I doubt it is an altitude issue. Since this was the first time I ran the Alde with propane and I have only run it on electric once I wonder if this is just stuff burning off of new materials.