Can we retrofit a high tank onto a flushometer toilet?
We have flushometer toilets in our 1921 co-op apartment.
We're going to have to replace them because NYC is mandating a backflow inhibitor which will cut the water pressure a lot, and they won't work. (Or, if they do work, they'll have much too negative an effect on the apartments above us.)
Other alternatives are to install costly pressure pumps and holding tanks, etc. Which is not really a desirable step.
Replacing the toilet is going to be problematic for several reasons:
-it's on an 8" rough-in (so, ripping up the tiled floor)
-it's got a side-intake flushometer (so, ripping open the tiled wall perhaps)
-it sticks out from the wall about 20", leaving plenty of room to stand in a room that's 50" wide; I can't find a toilet w/ less than 25-1/4" inches
So I got to wondering--can we just mount a tank above the toilet on the wall? You can buy the high tank by itself; can we simply attach it to the flushometer toilet?
And if so, can we offset the tank by a foot or so, or does it have to be directly below?