For those who followed my Harman Advance problems since 2005. My 3rd new replacement stove, replaced by Harman under warranty , is running beautifully with the modifications made at the factory. After 3 full months of running it (2 months run 24/7), I have no build up of charred material in the burn pot at all (same pellets always used Fireside Ultra). I haven't had to take a hammer and screwdriver to the burn pot at all to chip away any build up. Heat output is fantastic. Cleaning is now a breeze. Workman ship is excellent ( my 2nd replacement stove had workmanship flaws). Knock on wood...or should I say knock on pellets...I hope I didn't just jinx myself with the update First stove had "smoke in hopper" problem. Second stove had the same with other issues with workmanship. I also have a new dealer who is responsive...haven't had to call him yet...but he handled the delivery and installation of the 3rd stove very professionally and on the day and TIME that he said he would be here.