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I think I saw what looked like that done in a European video. It seems like a practical, if more expensive, idea. Smooth transitions. The boiler I'm thinking of comes straight out the back and this could eliminate a couple of elbows. Any downside?
I think you are referring to using the flexible liner as your stove pipe? They do not allow this in the states, as far as I know. The liners are UL listed to be installed inside and existing chimney, not acting as stove pipe. I believe some of the reasoning is its thickness compared to black stove pipe and it being flexible. What if it moves some towards a combustible?
I think with the forced draft fan that the boiler will have, you probably dont need to worry about the losses from the bends as much as you would with a natural draft unit.
All the way up the stack? I'm getting a chimney guy to install a new flue in a chase, and I didn't think I'd have to think about sealing each section joint. He quoted Dura Tech.
That's what separates a good installer from the rest of the pack Velvet. A good installer recognizes that every joint/connection has the potential for leaking & addresses that fact. The rest of the pack just slaps pipe together & calls it a day. Go with the good installer & sleep well at night.
All the way up the stack? I'm getting a chimney guy to install a new flue in a chase, and I didn't think I'd have to think about sealing each section joint. He quoted Dura Tech.
Only on the joints inside the house. I don't see any reason exterior joints would need to be sealed. The leakage is minimal but can be a nuisance for us inside guys.