What is the height of a wall hung water closet?

15" from floor to rim of bowl on a standard water closet and 18" on a handicap water closest. That means on the 15" standard -you need to be 15" from center of bowl to any side walls. (30" space if enclosed) On a handicap water closet-18" from center of bowl to wall with grab bar. And (36" space if enclosed) grab bar on both sides.