The question is not what you are answering. I did mistype the information, as the grey water does go to a maceator, but forget about the jurisdiction, etc. This is an industrial application with special circumstances. The question is on the long unwashed horizontal grey lines going to the...
Gray water is drainage from floor drains, and sinks. Cleanouts connected to storm.
IPC
I also need to ask the problem with unwashed sanitary cleanouts.
I have found one manufacturer that makes explosion resistant Class 1 Division 2 Group C & D electric water heaters in the 1000 gallon storage tank size, Hubbell. Is there another? I cannot find any.