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Bob F

On 5/22/2021 8:39 AM, wrote:
On Saturday, May 22, 2021 at 7:31:01 AM UTC-5, trader_4 wrote:
On Friday, May 21, 2021 at 10:09:46 PM UTC-4, DerbyDad03 wrote:
On Friday, May 21, 2021 at 9:29:43 PM UTC-4, Ed Pawlowski wrote:
On 5/21/2021 7:54 PM, DerbyDad03 wrote:
On Thursday, May 20, 2021 at 11:48:22 PM UTC-4, wrote:
On Thu, 20 May 2021 18:10:27 -0700, Bob F wrote:

On 5/20/2021 4:51 PM, wrote:
About a month ago my water heater (4ish years old) T&P valve popped off and wouldn't re-seal, so I replaced it. No issues for about a month, now it's dripping. I can"burp it" but drips again in a little bit. I'm wondering if I need to turn the temp down, I'ts where ever the factory set it, seems pretty hot. Not overly hot but hot. Thoughts??

Is there an expansion tank associated with this heater? It could have
failed.
That is my guess, if there is even a tank installed.
Back in the olden days the water expanded back into the system but now
they have back flow preventers and the expanded water has nowhere to
go.

Well, it's not a "timing" thing, it's a "system" thing.

Not all houses, even in these modern times, have backflow preventers.

Yeah, but most new ones do, especially if you have irrigation. My gas
fired water heat has an expansion tank too. Thousands of house built
here have them. Unheard of years ago it is now code many places.
I get that.

I was only commenting on the use of the words €œBack in the olden days
the water expanded back into the system...€

In millions and millions of houses the water *still* expands back into the
system. Like I said, its not a €œtiming€ thing. What happened in the olden
days still happens, in many, many cases, today. Only the OP can tell us
how his house is set up.

I do find it interesting that the OP is handy enough to replace the T&P valve
but he apparently hasnt ever stuck a thermometer under a faucet.
Just knowing basic physics goes a long way. Heat water, it expands. Why don't
all pressure relief valves open? Water has somewhere to go. Where does it go
in my house? If you have a well with a tank, the tank is where it goes. If you
have municipal water, it goes there, unless you have a backflow preventer.
Like you pointed out, my house doesn't, nor do most homes here. New ones,
IDK. If you have a BF preventer and no expansion tank or a water logged one,
pressure is exceeded and valve opens. Haven't heard from the OP again.
Maybe the WH blew?
No expansion tank, Back flow preventer? I don't think so. This house was built in1981. as I said it's 5 yr old heater. No other issues until
I replaced the TP valve .The second heater n the house does not blow off. I believe The pressure regulator is set to 35-40 PSI. Rural city water. I have not checked the temp, i'm not sure i have a thermometer to do that with....

If you have a pressure regulator, that likely acts as a backflow
preventer, so you might need an expansion tank.