kstills wrote:Just to re-cap what I've been reading here, when burning coal an unlined masonry chimney should work fine, and the coal ash even if it gets wet will not rot out the mortar between the bricks.
This would be accurate?
No, it will, but it will take more than a lifetime to do it. As long as the flue gasses don't contain a lot of moisture (which they don't with coal) it is a VERY VERY slow process. Any flue gas venting system will deteriorate, stainless will do it in less than five years and masonry (lined or unlined) will do it in over one hundred, which do you want?