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My plumber contacted a Navien rep who advised not exceeding the maximum specified vent diameter of 3", so I took the chance. Should we start seeing any issues or error codes, I would just plain have to have my plumber back out to tear into the ceiling and replace the whole run of the venting.

Hello all, I wanted to return to this thread, now a little over three weeks since the install of my new Navien 240A, and just report that all is well and that there have been no problems regarding the new unit's 2-inch venting being connected to the existing 4-inch venting which was required by...

Thanks, Jeff, and point taken. I realize that I'm rolling the dice here and accept that in the end I might end up having to have my plumber return in order to go into the ceiling and replace the vent system. But hey, here's hoping. : ) And here's hoping that's true, too, Fitter. I'll let you...

There are two separate 4-inch pipes, and I should also add that the venting is makes a 90-degree turn to the horizontal after entering/exiting the unit, then exit to the side of the townhouse (i.e. they do not run vertically to exit at the roof).

Hello all, I purchased a townhouse a couple of years ago which already had a tankless water heater, a Takagi unit which uses direct venting through 4" PVC for both its intake and exhaust. The original installer *did not* install the flush valves needed for regular maintenance (descaling), and...