I think what is meant is a virtical drain pipe is coiled on its outside not in any direct contact with the heated gray water.
In my pictue you will see that the coils are in contact with the gray water, Im sure this would allow for some kind of build up! (soap scum, hair, cooties)the core of the tank would be self-contained though! Dont really know if the build up would really effect its effenecy or create some kind of hassard.
The plumbing would remain the same size in use in the system 1 1/2" traps should work fine , the existing drain traps have never cloged in 20 years. For a controled drain maybe a ele t-stat! I think some cas have them today.[ Parent ]
