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Besides the oxygen diffusion barrier...........................

Mad Dog_2
Mad Dog_2 Member Posts: 6,882
Asked that the other day and couldn't give a definitive answer. Thanks Gents. Mad Dog

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  • Plumdog_2
    Plumdog_2 Member Posts: 873
    Spoke with the Big Dog

    at one of the makers about that subject. Seems that the Approvals and Ratings (ASTM and such) are based on the tubings ability to tolerate constant circulation of very hot chlorinated drinking water. Not all the tube sold (even under one Brand Name) can be interchanged for different uses, even though the dimensions and fittings may be the same. I would check to see if the tubing is rated in accordance with the Materials Standards in your Code.
  • Joe Brix
    Joe Brix Member Posts: 626
    Uponor's is all the same.

    That's what someone from Upon-bo told me. Their pex all comes off the same extruders. The heating pex is not rated for domestic water use, though, only because they never went to the expense to get it listed. It's the same stuff, with an oxygen barrier added.

  • Paul Rohrs_9
    Paul Rohrs_9 Member Posts: 2

    Does Viega's Pextron barrier tubing have the DIN4726 rating? I emailed them last night and have not heard.

  • Contractor
    Contractor Member Posts: 41

    Yes it does, see attached.

    I have a copy of there heat loss program which has all the literature on it, very handy at timees as you can see :). Their new heating pipe also has that listing.
  • Paul Rohrs_9
    Paul Rohrs_9 Member Posts: 2

    Thanks for the information and quick response.


  • Plumdog_2
    Plumdog_2 Member Posts: 873
    Tubing formerly known as Wirsbo

    had different types. I picked up an orphaned boiler job that was full of rust, and lo and behold the tubing is Aqua-Pex rated only for Potable Water.
  • Joe Brix
    Joe Brix Member Posts: 626
    Full of rust.....

    ....because of the lack of O2 barrier, I assume.

    I would never advocate using aquapex on a heating system containing iron materials. Upirsbo will not sanction the use of hePex for potable water, only because it is not listed (see my earlier post on this), but I have done it more than once in a pinch, for repair work, and it works just fine.
  • Glenn Sossin_2
    Glenn Sossin_2 Member Posts: 592
    Dual Ratings

    I heard that some manufactures simply pay to have the NSF approval so they can stamp it on their pipe and have a dual rated product. I also heard that Zurn, along with some other major player, is going to discontinue this practice. Intent is to have an NSF pex and a barrier pex - no more dual rating. Apparently driven by costs squeezing the bottom line.

    Makes it a little harder for the tradesman. He used to be able to carry a red pex and a blue pex. Easy to figure that one out. Now what?
  • Kevin O. Pulver
    Kevin O. Pulver Member Posts: 380
    I have Aqua-Pex in my house

    Of course, it's a small system and completely non-ferrous components. On certain very large jobs, it COULD pay to use non-barrier tube and spring for the more expensive bronze circs and potable exp. tank etc... Normally, I never do that, but it's a consideration. We don't HAVE to have O2 barrier. We DO have to address O2 diffusion on every job. Kevin
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