I have a finished basement, and need to add a 2nd waterheater for a new bathroom shower that acts as a carwash, flowing 24gpm! Is there any way I can tie into the existing 3pvc vent pipe for this 2nd waterheater? Adding a 2nd vent would require tearing into the ceiling, which would suck! Theoretically, you could add a couple of 3 PVC motorized ball valves, but it would be much easier to try to keep things simple.
Hope this helps You may have too also include an upgrade into the size of your fresh air supply
