Jump to content
Click here to check out our structured, online appliance repair training courses for rookies and experienced techs.

FAQs | Repair Videos | Academy | Newsletter | Contact


DISCLOSURE: We may earn a commission when you use one of our coupons/links to make a purchase.
  • Upcoming Events

    • 30 March 2024 02:00 PM Until 03:00 PM
      0  
      All Appliantology tech members are invited to join in this workshop on all things Appliantological: bidness, customers, tools, troubleshooting, flavorite brewski, whatever. Webcams and microphones are open and live!
      This workshop is also a great time for any students at Master Samurai Tech to bring any and all questions about the coursework. We're happy to walk through any concepts you're having trouble with. Think of it like office hours with your teachers. 
      If you have a specific appliance problem you'd like us to talk about, post it here! We need a problem statement and a PDF of the tech sheet or schematic so we can all see it on screen share. If you have a PDF that isn't already in the File library here at Appliantology, send it to us by attaching it to the contact form. 
      Also, follow this Calendar Event so you'll get notified of new posts here. Look for the "Follow" button either at the top of the topic on desktop or below the topic on mobile.
      Who: This workshop is only available to tech members at Appliantology.
      When: Saturday, March 30 @10:00 AM Eastern Time.
      Where: Online via Zoom
      How:
      Click here to go to the forum topic with the registration link. If you're interested, register now. Arrive a couple minutes early to make sure your connection is working. Set a reminder for yourself for this workshop so you don’t miss it.  And check out past workshops here: https://appliantology.org/announcement/33-webinar-recordings-index-page/

Water Heater P&T valve leaking - pressure coming in from city


demonrow

Recommended Posts

I found a post in this forum that appears to answer my question, but I wanted to start a new topic to get a better grasp of the big picture.

 

My p&t valve line goes up and out to the patio. There appears to be water there (maybe 8 to 10 oz) every morning (after showers?). Here's the post that leads me to believe its either build up or too much pressure.

 

http://appliantology.org/topic/27317-water-heater/?hl=p

 

So if it is too much pressure, here's my question; how much pressure should be coming in from the street? Its City water. Is this a measurable thing, for a non-plumber like myself? A way to test it?

 

We have a toilet that chronically runs for a second or two occasionally (I've replaced the entire tank kit by now) that also made me think I had too much pressure.

 

I'm familiar with the valve to limit the incoming pressure, but only in passing. I say hello. Its silent...

 

Any advice would be grratly appreciated. Even if its "Dude, call a plumber..." I can post pics and models #'s, but for now its more of a general, philosophical discussion.

 

Thanks,
D

 

 

Link to comment
Share on other sites

  • Replies 8
  • Created
  • Last Reply

Top Posters In This Topic

  • demonrow

    4

  • RegUS_PatOff

    2

  • certified tech group 51

    1

  • JJ Surfer

    1

Measure the water temperature, is it hot????..............Should not be over 120 degs. F.........Could be a failing  thermostat  letting the water get to hot after long heating cycles.......The P/T valve does not limit incoming pressure...............The P in P/T valve is for  pressure caused by   the  water system  ( city or a well pump ) exceeding the  valves rating about 150 P.S.I.....................The T in P/T is for temperature......... .If the temp exceeds it set  temperature , about 210 degs..................... possibly from a runaway condition of the thermostat(s)...................The big box stores have a pressure gauge that threads onto a standard garden hose bib, measured from out side or attach to the hose bibs at the washing machine................Gas or electric?????.

Link to comment
Share on other sites

Thanks. Its a gas unit. I'll check the temp. The toilet running leads me to think it might be pressure, so I'll look into the gauge. Appreciate your help; I'll report back.

D

Link to comment
Share on other sites

click on picture
P2AStudioShot.jpg

my city water pressure is 42 psi

Link to comment
Share on other sites

  • 3 weeks later...

Hey,

 

Finally got around to testing this. Got the pressure gauge. Pretty cool. The overflow pipe from my water heater doesn't have the threading. Put the gauge on my outside spicket and got about 68 psi. It spiked to 120 when I first turned it on.

 

Have not measured the water temp coming out of the heater, but I usually shower with no cold whatsoever, can't be too hot. We have (or at least had) small children, so we've always run it set just under "hot". Guess I could use a meat thermometer....

 

I'll report bck.

 

Thanks,

D

Link to comment
Share on other sites

... Guess I could use a meat thermometer....

 If you have a Harbor Freight Store near you,

$ 3.99 sometimes on sale for $ 2.99

image_1255.jpg

Link to comment
Share on other sites

  • 2 weeks later...

Your hot water heater Should have a max pressure rating, I'll bet 120 psi is close to its max. Either an adjust to your pressure regulator or replacement might be needed.

Link to comment
Share on other sites

  • 4 weeks later...

Is there a backflow or check valve on your water supply? If so, you may have to add an expansion tank to the supply line of your water heater. 

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...