Im trying to learn my stove to the point that it will eat anything efficiently. Everything I have found so far burns the same save the michigan hardwoods from TSC but they still burned OK. They left a lava pile but that was before I added the magnet trick to my stove and learned to up the combustion air one number to counteract this. So far, everything leaves a light fluffy ash at about a coffee cup a day for quantity. Problem I have is the temps have risen to damn near 60degf the past few days and I cant keep my house below 76deg if I run it on its lowest setting! But, I guess this is a good thing... Pellet conservation!