You are going to want about 2 gpm for an Oxygenics RV shower head, maybe more for others. The critical thing is going to be how many GPM you can get for a particular temperature rise. If you are camping in the cold, your water temperature could be 40 degrees or less. You will want at least 60 degree rise at 2 gpm. I don't think you re going to find one that will do that on 30A service, but you can look. Search here under plumbing forum for tankless to see if anyone has successfully done it.
Al
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“You cannot reason someone out of a position they have not been reasoned into"
Al, K5TAN and Missy, N4RGO WBCCI 1322
2002 Classic 30 Slideout -S/OS #004
2013 Dodge 2500 Laramie 4x4 Megacab Cummins
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