Thor's drawings on my Gemini shows both the kitchen sink and the bathroom sink plumbed to the black tank. I went kind of nuts on them, told them that if both sinks drained into the black tank, I was going to re-think owing it. To me having only the shower going into the grey tank is ridiculous. I checked today, despite the drawings, the kitchen sink goes to the grey tank, I opened the grey valve only, ran hot water into the kitchen sink, and got hot water out. The bathroom sink goes into the black tank, but I can live with that. I asked Thor for as built drawings, but they only seem to have the ones that show both sinks going into the grey tank. I think their logic is to insure more liquid going into the black tank, but I understand that, and have managed black tanks for years with no problems, really don't need or want their help, but there it is.
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