Has Anybody Used Flexible Chimney Liner to Tie In Boiler To Chimney?

[velvetfoot]

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?

 

[chimneylinerjames]

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?

 

[velvetfoot]

I guess that makes sense, thanks.

 

[Clarkbug]

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.

 

[velvetfoot]

Thanks, that's true. Does one have to tape the joints then?

 

[stee6043]

Thanks, that's true. Does one have to tape the joints then?

I used high temp RTV on all of my joints. Works like a charm. I don't think you'd need to worry about it if your boiler were outside, however.

 

[velvetfoot]

I used high temp RTV on all of my joints.

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.

 

[Frozen Canuck]

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.

 

[stee6043]

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.