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Polypropylene vents becoming the way to go
Several condensing tankless water heater manufacturers are now advertising Polypropylene as the flue material of choice, one example is Rinnai. The poly is able to with stand temps up to 230 degrees. No glue required fittings snap to together.
One of the companies is Centrotherm (ECO Systems) InnoFlue being used by Aerco, A.O. Smith, Bradford White, Buderus, Camus, DeDietrich, Embassy Industries, Grand hall, GSW, HTP, IBC, John Woods, Laars, Lochinvar, Monitor products, Napoleon, Navien, Noritz, NTI, Paloma, Patterson Kelley, Peerless, Raypak, RBI, Rheem, Richmond,Ruud, Slant'Fin, State, Tagaki, Triangle Tube, Viessmann and WaiWela to name just a few. It is UL-1738 listed and is the only polymeric listed vent system in North America.
You can use it to line an existing "B" vent chase with InnoFlue Flex.
Contact www.centrotherm.us.com or call 877-434-3432.
Another product is Poly Pro Green Vent a polypropylene product from Dura Vent.it is listed to ULC-S636.it is approved for use in Massachusetts one of the most difficult states to get approval on anything. Check with the equipment manufacturer for there approval for use with their equipment. Check www.duravent.com or in New England contact Kevin Bernier Regional Sales Manager his cell is 603-533-9370 or e-mail email@example.com