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No it does not change anything you having a "manifold" system.
If I was aware of it I would change it.That's not to say if I was you.If I was you I would think of you I would think of the life of my tank.
Sounds like we're kindof splitting hairs here.
I certainly appreciate the feedback. I am simply trying to gather my facts such that when I approach the installers I sound like I know what I am talking about.
Worse case scenario is that the installers refuse to do anything ... it should not cost too much to have a plumber make the corrections.
I actually saw some expansion tanks at Home Depot the other day. Not sure how much they are ... but if they are reasonable, I may as well grab one and have a new one installed.
"ABC Plumbing, did you install a TXT in a HW recirc. loop?" Yes.
"Did you read the manuf. instructions saying it's not for hot water?"Yes.
"Are you aware that the inspection office has been deemed immune from prosecution?" No.
"Members of the jury, we have expert testimony and letters from the manufacturer stating that the TXT failed while the plaintiff was on vacation because it was installed on the HW side causing $80,000 in damages that ABC Plumbing is obviously responsible for......"
P-crack, the Noritz diagram also shows the TXT exposed to hot water in the recirc diagram.
On a side note, as much as I dislike the tankless hype, I dislike a recirc. system with them even more.
It's kept separate from the return loop so very little exposure (if any) to hot water. Only way it would be exposed to hot water would be through convection/conduction. Not enough to damage the diaphram IMO.
What that diagram doesn't show is a small storage tank to alleviate sandwiching effects