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Thread: Low HW pressure on Tankless System

  1. #16
    Master Plumber master plumber mark's Avatar
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    Talking Exactly how long a process is this????

    How exactly do you know when you have
    flushed out these things anyway????

    When do you know you are back to max efficiencey again???

    I mean, do you get a murkey , frothey kind
    of chicken soup thing going in the vinegar after
    about a half an hour

    or are you supposed to let the vinegar sit still in
    the exchanger for a 15 minute period then flush it out
    and repeat the process over and over agian till the

    vinegar looks nasty????

  2. #17
    Licensed Grump GrumpyPlumber's Avatar
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    Quote Originally Posted by gmrules View Post
    If I do not put a valve on the hot side how can I isolate it and recover / recirculate?

    George
    A pump into the cold with a return off the hot side...as long as all hot fixtures are closed you're fine, though it will go into the hot line a bit...the flush has nowhere else to go.

    Also, another effective cleaner, DON'T laugh...unsweetened concentrated cool aid.
    It has citric acid, as Cass states above.
    "The biggest regrets we have in life are the chances we never took."

  3. #18
    DIY Member gmrules's Avatar
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    Thanks all for you r advise

    I will be doing it this weekend

  4. #19
    Master Plumber master plumber mark's Avatar
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    Talking again...when do you know its cleaned out good enough???

    No one cared to answer my queston...

    perhaps it was s stupid one, perhaps not.....


    How long a process is this and how or when do
    you know that you are back to 98% eff again??


  5. #20
    DIY Member gmrules's Avatar
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    Sorry Mark

    According to Nortiz 45 mins you need to circulate the solution

    I was expecting a more experienced person to answer

  6. #21
    DIY Member gmrules's Avatar
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    Well, I finished the de-scaling with very limited success, I did not get chance to head over to SAMs to get larger vinegar so I used CLR as recommended by Nortiz

    I ran it 50 mins and only helped little bit. Was so disappointed

    I will head over to SAMs and get the vinegar and heat it as BOBH suggested

    its a little better no where near normal

  7. #22
    In the Trades Bob NH's Avatar
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    CLR is a fairly dilute solution of 15 to 20% lactic acid and 2 to 4% gluconic acid. See the MSDS at the link below.

    http://www.hescoinc.com/Msds/comcl4.pdf

    They are both pretty mild acids and one of the most significant aspects of CLR is that it is unlikely to hurt you.

    Gluconic acid: http://www.jungbunzlauer.com/product...formation.html

    Lactic Acid: http://www.encyclopedia.com/doc/1E1-lacticac.html

    CLR is expensive for the amount of acid that you get. I would use hot vinegar because I know it will work. If I knew that the heat exchanger was stainless steel I might use about a 5% solution of muriatic acid (hydrochloric acid).

    http://www.improvingyourworld.com/ho...up_000482.html

  8. #23
    Licensed Grump GrumpyPlumber's Avatar
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    Quote Originally Posted by master plumber mark View Post
    No one cared to answer my queston...

    perhaps it was s stupid one, perhaps not.....


    How long a process is this and how or when do
    you know that you are back to 98% eff again??
    Quote Originally Posted by srdenny View Post
    . But I've got a Zoeller dewatering pump, hoses, bucket, and a bottle of CLR ready to go when the first call comes. I figure it should take about an hour w/a little travel time added in
    I'd have to say 1/2 to an hour, depending on water content & length of time from last flush.
    "The biggest regrets we have in life are the chances we never took."

  9. #24
    Master Plumber master plumber mark's Avatar
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    Talking Hey I got my answer......thanks Grumpy

    Quote Originally Posted by gmrules View Post
    Sorry Mark

    According to Nortiz 45 mins you need to circulate the solution

    I was expecting a more experienced person to answer

    You really cut me deep.....dude......deeeeeeeeep.....



    But this is not my frist trip to the Rodeo, .............

    http://www.weilhammerplumbing.com/houseofhorrors/

    I have thrown out tankless units that were totally
    limed up over the years,
    because they were never de-limed ......

    its only been a long time since the last one I tangled with....



    anyway, now you know what a long painstakeing affair it can be to

    actually service one by finding out for yourself...




    SRDENNY......
    I wonder what you would have charged to get yourself
    into a day long event like this??

    what is the min. you woulld touch it for??





    perhaps you ought to let the CLR sit in the system
    overnight and see if it works its majic...

    if that dont work then you got big troubles...





    So Grumpy, if the unit has been de-limed every 6 months,
    a half hour is a goood rule to go by..................

    if it has been longer, you could get yourself into troubles...

  10. #25
    DIY Member gmrules's Avatar
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    heating the vinegar as I write this

    should have listened to u in the first place

    my bad

    ty for taking time to help me

  11. #26
    DIY Member gmrules's Avatar
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    Just finished not much better

    do not understand

    any other ideas?

  12. #27
    In the Trades Bob NH's Avatar
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    Do you have or can you install a pressure gauge on the inlet and outlet sides of the water heater so you can know how much loss there is, and compare it with the rating from the manufacturer? You would need to know the pressure difference and the GPM for that condition.

    Have you checked to verify that there are no screens or valves anywhere in the system? Some of those heaters have a control that limits the flow if the water is not up to temperature.

  13. #28
    DIY Member gmrules's Avatar
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    I have on pressure gauge

    i can measure it as I put in bolier drain to flush

  14. #29
    DIY Member gmrules's Avatar
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    I can get static pressure

  15. #30
    Licensed Grump GrumpyPlumber's Avatar
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    Aaaaannndd??
    "The biggest regrets we have in life are the chances we never took."

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