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Old 01-26-2015, 12:28 PM   #1
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Water heater leaking at cold water inlet outside.


The cold inlet pipe between the wall and the water heater is leaking outside of the wall. It's not the PRV but is from the cold side. I went to the hardware stores with pictures and nobody knew why the extra small pipe is coming out from the cold inlet. Why is it leaking outside and what is it for?? I thought is was the PRV so replaced it and it's not the problem. It'll fill the metal bucket in about a day and a 1/2. Thanks for your help.
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Old 01-26-2015, 01:13 PM   #2
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I have a expansion tank close to my WH. Makes me think, this may just be a expansion valve it's connected to, but i'm just guessing.....The Pro's will be along shortly!

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Old 01-26-2015, 03:42 PM   #3
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Looks like something that was used for an ice machine or something that needed a water hookup. Idk, just guessing.

Can you post a close up pic of that t coming off the incoming cold water line. Looks like some sort of saddle valve. Thanks.

Last edited by jmon; 01-26-2015 at 03:46 PM.
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Old 01-26-2015, 04:30 PM   #4
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Quote:
Originally Posted by jmon View Post
Looks like something that was used for an ice machine or something that needed a water hookup. Idk, just guessing.

Can you post a close up pic of that t coming off the incoming cold water line. Looks like some sort of saddle valve. Thanks.
Hope this helps.

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Old 01-26-2015, 04:46 PM   #5
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I think that is a water heater backflow preventer with the drain/vent piped outside.
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Old 01-26-2015, 04:49 PM   #6
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Very possible.
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Old 01-26-2015, 04:50 PM   #7
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Quote:
Originally Posted by Oso954 View Post
I think that is a water heater backflow preventer with the drain/vent piped outside.
It started leaking about 6 moths ago. I've been in this house now for about 5 years. Why now??
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Old 01-26-2015, 05:07 PM   #8
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Quote:
Originally Posted by Oso954 View Post
I think that is a water heater backflow preventer with the drain/vent piped outside.
Yep, I agree for the most part. I bet its something your local code requires.
What does the metal tag say on it?
Have checked your water pressure?

BTW- I dont see a PRV, I think you meant TPR (temp/pressure relief) valve.
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Old 01-26-2015, 05:14 PM   #9
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Quote:
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Yep, I agree for the most part. I bet its something your local code requires.
What does the metal tag say on it?
Have checked your water pressure?

BTW- I dont see a PRV, I think you meant TPR (temp/pressure relief) valve.
I don't think it's a local code requirement 'cause my neighbors don't have that setup on their water heater.
How do I check my water pressure?? The water does flow out fast at first than slows down to normal from sinks in the house.
I guess TPR is the right term. I guess you knew what I meant though.
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Old 01-26-2015, 05:39 PM   #10
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The metal tag reads:

Other side a blank.

So far even the hardware stores, the plumbing stores, and even the store that sells water heater and parts are at a lost. They all say that they never seen that setup before.
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Old 01-26-2015, 05:51 PM   #11
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It is a pressure expansion relief valve used in lieu of an expansion tank. It vents water to relieve excess pressure. If you don't want to deal with the drain water replace with an expansion tank.
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Old 01-26-2015, 05:54 PM   #12
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http://www.airdelights.com/W-Model-BVEC.html

Buy a pressure test gauge at your hardware store. Screw it on your hose bib and take a pressure reading.
Also check the temp at your faucets.

It could just be that the valve failed.
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Old 01-26-2015, 06:04 PM   #13
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Quote:
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It is a pressure expansion relief valve used in lieu of an expansion tank. It vents water to relieve excess pressure. If you don't want to deal with the drain water replace with an expansion tank.
I see. But why is it on my water heater and not the neighbors and the hardware store is lost about what it is??
Also why is it leaking now??

Last edited by DesertRat; 01-26-2015 at 06:12 PM.
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Old 01-26-2015, 06:07 PM   #14
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Here is a link to the spec sheet on it.
http://dar.proflo.com/darmanager/Que...=SPECIFICATION

As it is a combination valve, you might try operating the shut off valve a couple of times. With a little luck, you might clear some trapped sediment.

The Mfg.s phone number is on the bottom of the sheet. You could call them and see who handles their product in your area.
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Old 01-26-2015, 06:14 PM   #15
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This is a thermal expansion control device. It is doing its job dumping excess pressure out that small pipe. Like Javiles said if you do not want that install a hot water tank expansion tank and remove the expansion control device.
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