No room for a flue to use gas tank-less in my building.

The copper apparently was installed with some belly. The belly filled up with sediment until it blocked flow. The plumber said the stuff lying in the pipe corroded it. As for salvage the pipe was half full of suspicious looking gunk.

I left it on the curb for somebody who wanted the copper enough to take it along with its cargo.

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.