Now I can see why I didn't burn New England's in my furnace. The carbon build up in the burn pot is incredible and the ash clump at the edge of the burn pot is really thick. I'm having to scrape the burn pot every day and it is full of carbon. These things really suck! That will teach me to run out of the good stuff too early. Lesson learned for next year. It's spring here in New England. Time to get ready for winter.