I don't remember or go back & read what U "Drake" posted, I was making info available to readers of this thread about Legionella, as 1 company pushes open systems.
I have read that Marathon is a great DHW, so no problem with me.
Is your pex 5/8" OD = 1/2" pex, or 5/8" ID ? The heating difference is slight but the pumping back-pressure is considerable.
I have no knowledge of solid crimps.
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