I had read a post that was mentioned about.... wood coal still left unburnt in the stove . I would see this in my P.E. summit when loading al the wood at start or at refire then when the wood starts to die down hours later and more wood is loaded on top. One keeps adding new wood and some of the wood coal that was there ends up getting unburnt under the stack and over time can build up . I do two things #1 when there is only hot coal left in the stove and need more heat i will open the damper to med setting and crank the coal heat up , move it around every once in a wile to get all the coal burning and work the coal bed down . Once the coal bed is burnt down i can now take out "ash" and reload. This way normally take about 3 + hours in my stove . The other way is #2 I will also add "one" small to med size log every 3 or so hours. By doing this i get the new burning wood heat and also the coal logs that just went to coal logs keep burning and also the left over smaller coal that was there before the coal logs will keep buring and not get a next layer of wood right on top. This way i do get more even heat over the day but one would have to be around the home to do the 3 hour "one log" reload. I work from home so i can do this in the day. These are my thoughts and the 2 different ways to work down the wood coal to ash with more even heat . I know some stove owners need more of the wood-heat and just cant keep the house warm with the left over coal that is on the lower setting over 6+ hours. I have been burning wood for over 12++ years so i know stoves , houses , wood , were one lives make a big difference so i thought we could post some of our "thoughts" and "how 2's" on the burning of wood and burning down the coal with less left overs.