Chimney liner - do I need one?

[freeburn]

I'll make this to the point. I'm wondering if I need a chimney liner?

Wood furnace connected to interior masonry chimney. 6" outlet on furnace.

18' high, 7.25" round inside diameter, terra cotta clay lined. I don't think the tiles are bad because the previous owner used the chimney for oil burner from 1972 to 1993 when nat gas furnace was installed. I used it last year and the previous year. Only thing was the top of the chimney wasn't quite high enough above the roof line. I solved that problem temporarily by adding another 2 ft section of clay liner and cemented around it. Looks terrible, but works.

Is a stainless liner recommended for this application? Do I cut off the added clay tile and just extend the stainless up higher? Your thoughts/recommendations? If a liner is recommended, where is the best place to get one?

 

[laynes69]

I would say you don't need a liner. That liner is well within the requirements for size, and is internal. If your tiles aren't cracked and the chimney isn't in bad shape I wouldn't line. What type of chimney is it? Having something thats 2 feet above thats not protected would be a place to collect creosote easily. If its brick, why not have someone add a couple of feet to it?

 

[smokinj]

Be nice to have some Pic's?

 

[freeburn]

Not sure what you mean by the "type" of chimney. It's the cement chimney blocks (I want to say 12" X 12" maybe larger?) with mortar in between, then the clay liners are cemented inside that vertically.

The piece I added on to the top actually doesn't have any creo in it after I cleaned it. It looks new! Sorry, can't get pics right now, camera on fritz.

 

[pybyr]

I've got an 8" round tile lined flue and it's worked well with both the prior ancient-technology hot air wood furnace and, for the last several winters, my Econoburn gasification boiler.

 

[freeburn]

PYBYR - Good to know, I think I'll just leave well enough alone and remember to clean it. Do you have a chimney cap on yours? If so, any problems with creosote dripping off onto chimney?

 

[pybyr]

PYBYR - Good to know, I think I'll just leave well enough alone and remember to clean it. Do you have a chimney cap on yours? If so, any problems with creosote dripping off onto chimney?

No cap, though I probably should