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I have the 3.8 gallon Rinnai >>outdoor<< unit running from a 215 gallon LP tank using a high-pressure system. I have 10psi to the house through 3/4 inch underground plastic gas pipe, and then 1/2 inch black iron inside the cabin and through the wall to the unit. Pressure regulator is at the...

I don't see where you say what your water source is. I have two Rinnai units, one at our "town" house fed from chlorinated city water and one at our cabin fed from our private well in the fractured marble/granite typical of the Piedmont in North Georgia. The "town" house unit never has any rusty...