(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 15 of 16

Thread: New T&P leaks more than old one

Hybrid View

  1. #1
    DIY Junior Member ThaDoctor72's Avatar
    Join Date
    May 2011
    Location
    Powell TN
    Posts
    3

    Default New T&P leaks more than old one

    History:
    Bought a 1972 house with a 5 year old Bradford White 80 Gal WH.
    There is a PRV on cold inlet just above WH.
    There was no hot water when we moved in, so first thing I did is replace a bad lower element. After replacement, the red cutoff button on the top t-stat pops out after a few hours. (There is no temperature dial on the top element, only the bottom)

    Issue:
    The old T&P pushed out a 2 gallon bucket of water per day.
    I replaced it with a typical 150psi valve this afternoon. The power to the WH has been off all day since this morning.

    In the last 6 hours, the new T&P has let out 14 gallons. (room temperature) OMG I HATE WATER!!

    Other notable plumbing attributes:
    This is a 5 br house with basement, 3.5 bath, and the hot water trickles while the cold has about 55psi. Copper pipes, and there is no expansion tank in the line. I've reduced the PRV and still no change.

  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,605

    Default

    You may have one problem or several. You have to determine WHY the reset popped out. I have NEVER seen a thermostat, top or bottom, which did NOT have temperature settings. Have you checked the ACTUAL pressure in the house to determine if the PRV is defective or not?

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,381

    Default

    Install an expansion tank first, then see if the T&P stops leaking. Once you have an expansion tank in the system, get a pressure gauge and check things. Doing this first will only confirm that you have an expansion problem that is causing the T&P to dump water. Then, if you have hot water leaks elsewhere, those will just make the problem worse since the WH will need to run more often to reheat the incoming cold water, creating more expansion, and more discharge.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #4
    Jack of all trades DonL's Avatar
    Join Date
    Mar 2011
    Location
    Houston, TX
    Posts
    3,637

    Default

    I have seen Water heaters that are Controlled by 1 thermostat, And have two elements.

    The rating of the new element, may be overloading the old cut off. Could be the other element is shorted.
    But there is some reason that it cut out.

    When You heat water, It expands and the extra volume has to go somewhere.
    You would think a expansion tank would be a requirement, If it is on a city Water Supply.

    If it is on a private water well, then the Water tank may be waterlogged.


    ThaDoctor72, Welcome to Terry's Forums, Good Luck on your project.

    Have a Great Day.


    DonL
    Theory only works perfect in a vacuum.

    Cyber Security Protection for Windows C:\ > WWW.WinForce.Net

  5. #5
    In the Trades Gary Swart's Avatar
    Join Date
    Sep 2004
    Location
    Yakima WA
    Posts
    7,245

    Default

    Sound like either no thermal expansion tank or a faulty one.

  6. #6
    DIY Junior Member ThaDoctor72's Avatar
    Join Date
    May 2011
    Location
    Powell TN
    Posts
    3

    Default

    Thanks for the input. I will install an expansion tank this weekend and update. I've been wanting to install an interior master cutoff valve anyway, so this will give me a reason to use these new SharkBite fittings.

  7. #7
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,605

    Default

    quote; The power to the WH has been off all day since this morning.

    Without power there is NO thermal expansion so that cannot be the cause of the T&P valve discharging.

    Quote; I have seen Water heaters that are Controlled by 1 thermostat, And have two elements.

    IMPOSSIBLE unless the elements are so underpowered that they could not overload the circuit, and then it would be impractical, plus it would have to be the upper thermostat to control it properly. I have never seen or heard of ANY heaters wired that way. OVERLOADING the circuit would trip the circuit breaker NOT the thermal high limit which only responds to excessive temperature.

Similar Threads

  1. new Am Std cartridge leaks...replaced still leaks
    By captjackny in forum Shower & bathtub Forum & Blog
    Replies: 2
    Last Post: 07-02-2011, 01:25 PM
  2. Now it Leaks, Now it Doesn't... HELP!
    By MisterMagoo in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 7
    Last Post: 05-07-2009, 01:50 PM
  3. Something Always Leaks
    By SteveB in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 5
    Last Post: 12-09-2008, 06:17 PM
  4. My new toilet job leaks
    By paperbag3 in forum Toilet Forum discussions
    Replies: 4
    Last Post: 10-12-2008, 08:53 AM
  5. leaks only when shower is on?
    By djwoody in forum Shower & bathtub Forum & Blog
    Replies: 4
    Last Post: 03-10-2008, 08:14 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •