True and good point. My late fathers house had a three flue chimney, furnace, fireplace and basement fireplace. All had the same sized flue...8x12/9x13. The upstairs fireplace got a poor draft and was always smoking. Shouldve been a 12x12 flue. This was back in the 1970's. He did install a smoke baffle which did help a little.
I would think a modern EPA rated wood stove would be better than coal. That 64 Galaxy on the other hand is way better than anything modern, FE 427?
The outlet on the fisher is 8". I had this stove hooked up before to a 6" chimney and it only drafted "ok". The only concern I have with the chimney on the house is the clay collar going through the basement wall to the chimney is only 6". So from stove top I will go up approximately 36" to a elbow, 2-3' of pipe then a 8" to 6" reducer going out the wall into the 8"x8" chimney which then goes up another 18' approximately. I'd like to think the chimney will have enough draft to overcome the reduction through the wall.
It very well might have enough draft with the additional heat produced by the wood stove, but I still don’t like the smaller thimble. Just keep your fingers crossed. It may not be an issue. Just try it. The chimney itself should not be an issue at all. However, if you take the space for the face cord of wood and place bagged nut coal there you will be better served by the coal stove. Anthracite...zero chance of a chimney fire from a clean chimney. There is one caveat to that though...coal= much cooler exhaust temps and therefore less draft. Less...not no draft...just less. So, that means the wood stove is likely to benefit from a better draft in that chimney in the basement than the coal stove because the wood stove exhaust will be much hotter. That Fisher will slam out the heat for you, it will also eat you out of house and home. Make sure it has a baffle in it and if not put one in it. I would fully line the fire box with brick as well...but that is just me.
Thimble to top of the clay liner is approx. 18'. The fisher does have a baffle in it that worked very well when I had it in my shop. Hoytman is the point of more firebrick to help radiate more heat?
...into the firebox for cleaner combustion. These stoves work fine without them. Often too well because they throw serious heat off the steel.
Well I myself have a Fisher Mama Bear and she gets hungry when it gets real cold. Downside to living in a block house I guess. Then again I try to keep the house around 80°
