Can my dummy 3rd flue be made useful?

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Old 09-23-13, 10:09 AM
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Can my dummy 3rd flue be made useful?

I have a 3-flue chimney where the center is a traditional fireplace, the left flue is a 100,000btu boiler and the right is filled with cement at the top. I've been told by a bricklayer that this is common. What I'd like to know is if that 3rd flue is built to be useful if the plugged section of fluepipe is replaced?

I'm trying to figure out where to install a tankless gas water heater and it sure would be convenient to use that flue to house the vent pipe.
 
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Old 09-23-13, 10:29 AM
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It sounds like the 3rd flue was just put there for aesthetics. I highly doubt there is any flue liner or chase under what you can see although the only way to know for sure would be to open it up
 
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Old 09-23-13, 10:39 AM
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I don't have any personal experience with tankless water heaters, but I've heard of some less-than-successful DIY installations. Almost all of which involved people installing them who didn't know what they were doing. Adequate gas and water supply lines and venting requirements are critical for proper performance.

I think your tile flue venting question would best be answered by a manufacturer's technical rep of the tank you intend to buy.
 
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Old 09-23-13, 10:46 AM
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It might be possible to put a convention 2' length of ceramic flue and then slip drop down a wrinkled tin flue and then try to make the top look compatible.

Just a crazy thought -

Dick
 
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Old 09-23-13, 04:11 PM
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Just a crazy thought -
Works for me. I'd just like to hide the vent pipe(s). I've seen other older homes with odd shiny metal or plastic things sticking out of a flue.

Worst case would be #3 is solid or full of rubble. I won't rebuild the entire chimney for this idea.

I was describing my chimney (flaking stucco) to this mason repair guy I met--long before and completely unrelated to my question about using the 3rd flue-- and he said "I'll bet that 3rd flue is capped with concrete". Was I surprised when I got up there & found he was right.
 
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