My water heater sits on a concrete slab floor in my utility room next to a wall with a bathtub drain, and a few feet over from my washing machine drain. When I replace the heater I would like to install a water heater pan and have it connected to the tub drain (I haven't yet consulted a plumber about this--I assume it would be possible).
The issue I see is that if the water heater pan is sitting on the floor then the drain will--at best--be level. Will the drain is effective in this scenario? Would the heater need to be raised so that the drain could better be gravity fed?Would another option be altogether better?