Sorry I let this drop down, I am reading it I just had to go away for work for the week.
I am indeed looking at a stoker boiler, I'm too lazy to load it more often then every couple days.
I don't want to put it outside mainly because of the building codes in the area involved in a new outbuilding.
I looked at the combo oil/coal furnaces, however I have a fairly new oil furnace (approx 6 years old) and replacing it would add unnecessary cost if I could put an add-on coal boiler in the system. I just realized I forgot to mention that I have primarily oil heat right now. My wood stove simply heats the basement (unfinished) and then the air circulates upstairs through an open basement door. Is an add-on boiler a good choice generally, or is it difficult to control which source heats the water...between my main furnace and the add-on?
What about the AHS stoker coal gun makes it a superior unit? Is it more efficient? I was looking at that unit but the cost seemed prohibitive based on a cost/BTU.