Bruce M wrote:
I have my stove down the basement and now it's time for the chimney purchase and install. It's a 7"flue and I will be using double wall stove pipe to exit the basement due to clearances with the floor joists, 10" clearance. The dealer I bought the stove from, who also burns coal, recomends the top of the line SS class "A" from http://www.olympiachimney.com/products/cat/VCAA/
. He says the heavier gauge is what I want. I don't mind spending the money on the best as long as there is a large enough difference in the durability. the dealer thus far has been nothing but helpful and a great guy to deal with so I have no reason to doubt what he says is true, I just want a second opinion I guess. So what say you, is this what I need.
I wouldn't waste money on the "best" as it will only last slightly longer than the worst, which isn't long. Go with the cheapest 316ti chimney you can find. Or you could do it right and save money - spend a weekend or two and throw up a block stack with an 8/8 tile liner; If you want inexpensive and decent appearance, "stucco" it in the living spaces and use block the whole way. A masonry stack with tile flue will last a lifetime.
Few initially believed the problem with stainless flues was as serious as it is when I first mentioned it a few years ago, however, I've seen multiple failures personally, and a few already on this site. As time goes on and more people on this site and elsewhere more thoroughly inspect and/or have serious failures with their flues, I fully expect this problem's significance to be apparent to everyone. Stainless (of any common alloy or thickness) doesn't hold up with coal, it shouldn't be used, and it may pose a serious safety hazard in certain circumstances.