Well you heard it here first!
I'm in the process of the coal burning equipment change operation. I really expect it to be painless!
So to this thread, Long burn times in my 1600 on wood were related to a good bed of coals and then packing the box with all shapes and sizes. The baro is also key to this and I have also done it without it. Truthfully once I learned about the art of controling draft with the baro I had better burns in both coal and wood. Get a manometer and learn with the right tools. It's cheap insurance and what you will save in fuel will pay for it the first month or less. I love the beast. So if your interested in a used 1600 delivery possible this is the first for that as well.
Hate to see it go!
Gone Stoker Boiler