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  1. #1
    Join Date
    Oct 2013
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    1

    Default Hot Water Heater Emergency Temperature/Pressure Valve replacement

    I watched ask this old house and they said you have to test your emergency t/p valve once a year. I never knew that before. When I tried it, it was hard to open and then after it let it close, it started to leak just as Tom said on the show. Luckily, it is only about a $15 part that is pretty easy to replace though there is more water in the top of the tank than I thought and I made a bit of a mess. Even though I've never had a water tank explode, I feel better knowing that this relief valve is working properly.

    Thanks!

  2. #2
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    5,089

    Default Re: Hot Water Heater Emergency Temperature/Pressure Valve replacement

    Your concern is justified.

    Have you successfully replaced your temp & pressure valve?

  3. #3
    Join Date
    Feb 2010
    Location
    South*East
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    1,168

    Default Re: Hot Water Heater Emergency Temperature/Pressure Valve replacement

    I have been around for a long time and I don't understand just what this test is trying to prove. In over 50 years I have never seen a relief valve that didn't open when lifting the lever but I have seen many that once opened they don't reseat. Just how would this test prove it's not in working order? I wish I had a nickel for every relief valve I have changed because someone decided to opened it.
    Last edited by johnjh2o; 10-29-2013 at 10:45 PM.
    John

  4. #4
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,363

    Default Re: Hot Water Heater Emergency Temperature/Pressure Valve replacement

    What John said plus;

    1- I have seen ancient and new T&P valves blow when needed. I have never seen an exploded water tank. The valves do their jobs well.

    2- Is your T&P valve piped to a safe location so when the valve releases it doesn't flood the house or burn anyone?

  5. #5
    Join Date
    Nov 2012
    Location
    central pa
    Posts
    98

    Default Re: Hot Water Heater Emergency Temperature/Pressure Valve replacement

    it is not really a test. the idea is to open it every so often to make sure it doesn't seize up. also if you open it regularly it wont leak after you close it. there was a water heater that blew near us about 8 years ago and it blew the from wall of the two story house off the foundation. it doesn't happen often but when it does it is bad.. the reason is that both the high limit switch and the relief valve both have to fail which rarely happens but it can so why not just open the valve occasionally to be on the safe side

  6. #6
    Join Date
    Jun 2007
    Location
    Fayette County, Ohio
    Posts
    5,558

    Default Re: Hot Water Heater Emergency Temperature/Pressure Valve replacement

    Periodic opening lets water get up in the T&P valve, evaporate, and leave deposits. Those deposits is what can cause a valve failure.

    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  7. #7
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    5,089

    Default Re: Hot Water Heater Emergency Temperature/Pressure Valve replacement

    A true horror story:

    A "plumber" replaced a large water heater in an apartment building in Santa Monica a few years ago. The new water heater came without a T&P valve, so he plugged the hole tight. Subsequently, the water heater blew up very shortly after that, killing 10 tenants.

    Moral of the story: don't tamper with the valve and make sure it works properly.

  8. #8
    Join Date
    Jan 2008
    Posts
    1,101

    Default Re: Hot Water Heater Emergency Temperature/Pressure Valve replacement

    I've seen the results of a water heater explosion and it ain't pretty. Then again that is just one instance in millions of homes which I've seen so.......should you worry about it? That's up to you. I do test mine annually to be sure it's not seized and I replace older ones as a matter of habit as some years ago there was a huge recall of these by the major manufacturer of US T&P valves as they would not open properly. Most of those will be gone in another ten years so it's up to you whether you want to worry or not. Of the T&P valves I test, maybe 1 in 10 leaks afterward. As cheap and easy as replacing one is I go ahead and test, I'd rather have one I know I can trust than a maybe, especially knowing how my luck (or more appropriately the lack of it) goes!

    Phil

  9. #9
    Join Date
    Feb 2010
    Location
    South*East
    Posts
    1,168

    Default Re: Hot Water Heater Emergency Temperature/Pressure Valve replacement

    Lifting the lever and opening the valve doesn't tell you that it's working. All you are doing is opening the valve manually. That doesn't tell you that it will open with excessive temperature or pressure. If your concerned that it may not be working then replace it.
    John

  10. #10
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    5,089

    Default Re: Hot Water Heater Emergency Temperature/Pressure Valve replacement

    T&P valves go for less than $10. Changing a suspected valve should be a non-issue.

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