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

Thread: Replaced toilet, shower head - TPR leaking

Hybrid View

  1. #1
    DIY Junior Member
    Join Date
    Jan 2010
    Location
    NH
    Posts
    4

    Default Replaced toilet, shower head - TPR leaking

    Hi all - first post.

    I'm an IT guy, but can do some no-brainer type activities - changing toilet, shower heads, replacing faucets etc - nothing that requires touching gas or sweating any pipe.

    I removed an old toilet & shower head (doing some bathroom tiling & green board in my shower). It took me a few days to get the toilet in and in that time my TPR on my gas hot water heater started leaking. I have a bowl under it just in case, but it was filling it up in a 24-hour time span.
    The TPR valve was replaced in July 09, and had been fine until the toilet removal.

    I put the toilet in, but not the shower head & then read something, somewhere about 'if you haven't done any plumbing or renovation work, it's probably a bad TPR.' I temporarily put the shower head back in, ran hot water out of all my outlets - and it seems as if the dripping has lessened. Coincidence? Think it'll stop all together?

    Any thoughts would be appreciated! Thanks!

  2. #2
    DIY Senior Member SteveW's Avatar
    Join Date
    Feb 2005
    Location
    Omaha, NE
    Posts
    1,042

    Default Could be thermal expansion

    Go and buy a $10 pressure gauge from a hardware store, and hook it up to your washing machine hose bib.

    Then see what your house water pressure is.

    Next, turn on your bathtub faucet to full hot for a couple minutes, to partially drain your water heater. Shut off the tub faucet, make sure no one in the house runs any water for a while, then immediately go and watch the pressure gauge. If it starts to rise under these circumstances, you have "thermal expansion" and need an expansion tank.

    I am guessing that your old toilet may have allowed this excess pressure to vent off from time to time so the TPR valve didn't leak - until you replaced the toilet.

  3. #3
    DIY Junior Member
    Join Date
    Jan 2010
    Location
    NH
    Posts
    4

    Default

    Steve -
    Thanks for this, very helpful. Home Cheapo, here I come!

  4. #4
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,390

    Default

    Water will leak at the weakest point. A toilet fill valve sometimes is that weakest point. If it gets high enough to trip the T&P valve, assuming it is working, you've exceeded 150#. Sounds like you need an expansion tank.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  5. #5
    DIY Senior Member Runs with bison's Avatar
    Join Date
    Aug 2009
    Location
    Midwest
    Posts
    892

    Default

    As has been mentioned, the old toilet fill valve was acting as relief. Mine did the same thing! When I replaced the last of the three toilets with new Totos my T&P valve started leaking. I had already been using a test gauge and knew that I had not exceeded 120 psig in previous spikes (this was also the main's supply pressure. So I put the gauge back on the hose bib to confirm. The T&P was popping as it should at about 150-155 psig indicated.

    It was just a trickle, but I didn't want to rely on it resealing so I installed a thermal expansion tank (not required by code here.) I was also concerned about the spikes being hard on the new fill valves and other devices, as well as the potential for a burst/leak if there were any weak lines/connections.

  6. #6
    DIY Junior Member
    Join Date
    Jan 2010
    Location
    NH
    Posts
    4

    Default

    Thanks for the feedback!

    Now I have another question. Could I attach the pressure gauge to my outside water connection & turn it on, as if a hose was attached? It's literally 2 feet above the washing machine connection.

Tags for this Thread

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
  •