Hello Dave, I have used a Magic Heat in a wood system and they work pretty good. I think one would work better in a coal system than with wood because of no creosote with coal, only some ash.
You will need to use the Magic Heat's scraper every couple of days to keep the ash from building up on the heat-exchanger tubes. So if you make a duct in front of the Magic Heat, you will need to put a door in the duct for access to the scraper knob.
The fan in the Magic heat is thermostaticly controlled, [I don't know the temp setting] so you need to check to see if your stack temps are high enough to net you extra heat from the Magic Heat. I think you will need 300* stack temps at least to be effective. Most coal stoves have pretty low stack or flue temperatures, [pretty efficent] so you need to check your flue temps before you spend the $$.
The fan in the Magic heat is kind of noisy, at least on the one I had. Just beware. I mounted my Magic heat only 10" above a hot burning wood stove, so I don't think 15" is going to be an issue for you.
Hope this helps, Greg L [LsFarm]
Last edited by LsFarm
on Wed Feb 08, 2006 9:03 pm, edited 1 time in total.