The problem that I have is that my heater keeps shuting down. I know that it is not too big because of the calculations that you do for combustion. Also, it has left a tan/brown color on my white ceiling from last winter. The logs have been replace by the company and also the whole burner too. In fact the company could not find anything wrong with the whole burner when they tested it. The pilot light at times likes to float off the pilot. The gas company says everything is regulated to specs when they tested the gas pressure. I don't think that my house is too tight for the simple reason that it was build 30 years ago. I would greatly appreciate any helpful solutions. Thank you.