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.

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. They will sell you a small expansion tank that gives you some
wiggle room. It can be installed pretty much anywhere in the system.
In a misguided effort to save a little energy some people even
installed check valves in the cold water side of the water heater.
This expansion tank would have to be on the water heater side of that
valve.

On Thu, 20 May 2021 23:46:57 -0400, posted for all of us to
digest...


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. They will sell you a small expansion tank that gives you some
wiggle room. It can be installed pretty much anywhere in the system.
In a misguided effort to save a little energy some people even
installed check valves in the cold water side of the water heater.
This expansion tank would have to be on the water heater side of that
valve.

+1 To: OP The valve responds to temperature and/or pressure. You state the temp
is okay so that should not be the issue. This leaves pressure, which GFretwell
address'. Have you had any other plumbing issues lately? Like water hammer? Are
you on a well or public water?

Thank you for the question and let us know if you need any more help and how
the issue is resolved.

--
Tekkie

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.

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.

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.

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?

On Fri, 21 May 2021 16:54:03 -0700 (PDT), 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.

There is the International Plumbing code (2015 cycle cited here)

607.3 Thermal expansion control. Where a storage water heater is
supplied with cold water that passes through a check valve, pressure
reducing valve or backflow preventer, a thermal expansion tank shall
be connected to the water heater cold water supply pipe at a point
that is downstream of all check valves, pressure reducing valves and
backflow preventers. Thermal expansion tanks shall be sized in
accordance with the tank manufacturers instructions and shall be
sized such that the pressure in the water distribution system shall
not exceed that required by Section 604.8.

SECTION 608 PROTECTION OF POTABLE WATER SUPPLY 608.1 General. A
potable water supply system shall be designed, installed and
maintained in such a manner so as to prevent contamination from
non-potable liquids, solids or gases being introduced into the potable
water supply through cross-connections or any other piping connections
to the system. Backflow preventers shall conform to the applicable
Standard referenced in Table 608.1. Backflow preventer applications
shall conform to Table 608.1, except as specifically stated in
Sections 608.2 through 608.16.27 and Sections 608.18 through 608.18.2.


***********
It goes on to describe all of the code compliant ways to prevent water
from flowing back into the water system.