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Thread: flexible pipe at WH

  1. #1
    DIY Junior Member 68malibu383's Avatar
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    Default flexible pipe at WH

    I can't locate my list of approved piping materials that connect to the inlet/outlet on the water heater but I don't think this one (photo) makes the cut. Please advise.
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    DIY Senior Member kreemoweet's Avatar
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    Why not? There must be hundreds of thousands of stainless steel flex connectors installed on water heaters already. Perfectly legal anywhere I know of, as
    long as they are NSF approved.

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    Retired Defense Industry Engineer jadnashua's Avatar
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    Some places require flexible connections, some places require rigid connections, some places allow either as long as they are rated for this use. Places subject to earthquakes generally require a flexible connection and straps to hold it to the wall.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    Forum Admin, Expert Plumber Terry's Avatar
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    I like the stainless flex connectors. I also use copper.
    You don't use tape on the threads though. They come with rubber washers on the ends.

    Some people use tape in the most useless places. The sealing takes place at the end of the pipe where the rubber washer is, not on the threads.
    Last edited by Terry; 06-05-2012 at 10:56 AM.

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    Moderator & Master Plumber hj's Avatar
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    That is an "approved" material, although it could have been installed a lot more neatly than that. I do not use stainless, but rather use the copper flexible lines, but is is strictly a personal preference.
    Licensed residential and commercial plumber

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    TROJAN WORLDWIDE SALES RP MACPLUMB 777's Avatar
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    Yes you are right Terry,
    but the plumbers tape doe's make the nut easier to tighten onto the nipples,
    Last edited by Terry; 03-14-2014 at 05:18 PM.

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  7. #7
    DIY Senior Member kreemoweet's Avatar
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    Quote Originally Posted by MACPLUMB 777 View Post
    Yes you are right Terry,
    but the plumbers tape doe's make the nut easier to tighten onto the nipples,
    My experience is the exact opposite, tape in inappropriate places makes for more difficulty. Those nuts are not supposed to be made god-awful tight anyway, all you need to
    do is compress the rubber sealing washer, very similar to a garden hose connection. If you torque down on those nuts, you are probably damaging the seal.
    Last edited by Terry; 03-14-2014 at 05:18 PM.

  8. #8
    Moderator & Master Plumber hj's Avatar
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    It does NOTHING to help or hinder the connection, unless you put so many wraps of tape, that the nut is too snug.
    Licensed residential and commercial plumber

  9. #9
    General Contractor Carpenter toolaholic's Avatar
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    Quote Originally Posted by 68malibu383 View Post
    I can't locate my list of approved piping materials that connect to the inlet/outlet on the water heater but I don't think this one (photo) makes the cut. Please advise.
    WOW That sure is a hacked Job ! I use nothing but copper flexes. Plumb. and appropriate length ! Also our code requires 2 earth quake straps with 3/8" leg bolts.
    I install a lot of California earthquake shut off valves. 5.2or greater E.Q. and and it shuts off gas.
    Last edited by toolaholic; 06-08-2012 at 08:11 PM. Reason: Another thought !

  10. #10
    Moderator & Master Plumber hj's Avatar
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    YOU MUST use earthquake straps. It is a side benefit of living in CA. In most other areas it is not a requirement, or even a need.
    Licensed residential and commercial plumber

  11. #11
    In the Trades Gary Swart's Avatar
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    The only things I would have done differently is to change the length of the intake pipe so that a short flexpipe could have been used and the sharp bends avoided. I will say that at least the bends look like they were carefully made so they are not kinked, but shorter flex would have been easier as well as neater looking. You also have to abide by local and state codes on straps, shut off valve, etc.. California is very strict on those things, other places not so.

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