Just installed 520 and I must say it is a wonderful piece. I am still having trouble fine tuning it in. We use it to heat large tanks at my place of business. So I am looking towards a very high output. Right now I seem to get the best heat at 6 teeth and 6 air. I want to bump it up to 7 or 8 teeth but I can't seem to get enough air to it since I still get hot coals on the pot ledge. I am getting about 150 deg with the 6 and 6 setup. I really would like to see around 180 deg.
One thing I have noticed is the pot is not exactly level. The boiler its self is level but the pot leans towards the back slightly. This is a new unit and I double and tripple checked to make sure we had everything put together correctly. Any help would be appreciated. Thanks