Hot Water Heater: T&P Valve Drain Connected To Cold Water Intake - Plumbing - DIY Home Improvement | DIYChatroom
Advertisement


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Plumbing

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread
Display Modes
Old 06-30-2017, 07:26 PM   #1
Newbie
 
Join Date: Jun 2017
Location: Florida, U.S.
Posts: 5
Rewards Points: 10
Default

Hot Water Heater: T&P Valve Drain Connected to Cold Water Intake


Hot Water Heater: T&P Valve Drain Connected to Cold Water Intake
AO Smith Model ECS50-210

I am a new home owner, trying to learn about the appliances in my home, and their basic ins-and-outs. I know why the T&P Valve is connected, and how it works, generally speaking, but there is a bypass on the cold-water in-take that connects to the drainage pipe, stemming from the T&P Valve outlet.

Why would this connection be made? Is it a redundancy solution for pressure relief in case of a build-up?

Furthermore, the connection bypasses the cold-water intake cutoff valve. If the valve is closed for the purposes of maintenance on the water heater, would this divert the cold-water flow to the drain? And wouldn't that mean I would be required to close the water supply off closer to the main source to stop a continuous flow through the drain?

I'll provide more information upon request.
Any (accurate) feedback is appreciated. Thank you.
rfrankmcm is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 06-30-2017, 07:37 PM   #2
Plumber
 
TheEplumber's Avatar
 
Join Date: Jul 2010
Location: North Idaho
Posts: 11,437
Rewards Points: 254
Default

Re: Hot Water Heater: T&P Valve Drain Connected to Cold Water Intake


The pipe from the T&P is an indirect waste line. So the other line should be an indirect line as well. Can you upload a picture of the line and it's connection at the CW supply- or at least describe it?

BTW- welcome to DIY Chatroom!
__________________
When posting in forums, letting us know your location will help others give better feedback/advice/solutions to your questions
TheEplumber is online now   Reply With Quote
Sponsored Links
Advertisement
 
Old 06-30-2017, 07:59 PM   #3
Newbie
 
Join Date: Jun 2017
Location: Florida, U.S.
Posts: 5
Rewards Points: 10
Default

Re: Hot Water Heater: T&P Valve Drain Connected to Cold Water Intake


Thanks for the quick response!

The cold-water line goes from the wall to the tank. In-between that there is a cutoff valve for the cold-water. Between the wall and cutoff valve is a pipe that goes up vertically, and then through a set of elbows drops down toward the tank, and intersects with the T&P indirect waste line (as you pointed out).

I am not sure if that description is accurate enough for our purposes (I am still learning how to attach an image via URL). If you need a better description, I will provide it as best that I can. Meanwhile, I'll see if I can figure out how to attach my file image.
Attached Thumbnails
Hot Water Heater: T&P Valve Drain Connected to Cold Water Intake-img_0839.jpg  

Last edited by rfrankmcm; 06-30-2017 at 08:20 PM.
rfrankmcm is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 07-01-2017, 06:01 AM   #4
Naildriver
 
chandler48's Avatar
 
Join Date: Jun 2017
Location: Young Harris, Georgia
Posts: 9,467
Rewards Points: 3,570
Default

Re: Hot Water Heater: T&P Valve Drain Connected to Cold Water Intake


I've never seen this set up, but it appears the installer is using an over pressure valve as an expansion tank substitute. If the pressure is too high on the tank after heating the water, the valve will open and evacuate the excess. Others may have different views on it, but IMO an expansion tank should be installed at the water inlet, all the piping removed and capped down to the lateral evacuation line to allow the T&P to operate independent of the expansion valve. Let the others comment as well.
__________________
Larry......
Half of Communications is Listening, and You can't Listen with your Mouth.
chandler48 is offline   Reply With Quote
Old 07-01-2017, 06:48 AM   #5
Member
 
Join Date: Nov 2016
Posts: 529
Rewards Points: 1,054
Default

Re: Hot Water Heater: T&P Valve Drain Connected to Cold Water Intake


That's not to current FL code. New code requires a pan in habitable space with the pan draining to outside. The T&P has to be drained directly into the pan.
clarenceboddick is offline   Reply With Quote
Old 07-01-2017, 06:55 AM   #6
Property Mgt/Maint
 
Join Date: Mar 2015
Location: Upstate NY
Posts: 6,478
Rewards Points: 8,202
Default

Re: Hot Water Heater: T&P Valve Drain Connected to Cold Water Intake


Also concerning, the cathodic rod appears to have been removed. The tank will be short lived if so.
Yodaman is offline   Reply With Quote
Old 07-01-2017, 07:10 AM   #7
Naildriver
 
chandler48's Avatar
 
Join Date: Jun 2017
Location: Young Harris, Georgia
Posts: 9,467
Rewards Points: 3,570
Default

Re: Hot Water Heater: T&P Valve Drain Connected to Cold Water Intake


Clarenceboddick, question. IF the T&P valve exits the building as it appears to and is within 6" of the ground on the outside, why would it violate code? I would prefer it evacuating to the atmosphere than into a pan where there may or may not be a means of it draining successfully. Just curious.
__________________
Larry......
Half of Communications is Listening, and You can't Listen with your Mouth.
chandler48 is offline   Reply With Quote
Old 07-01-2017, 08:21 AM   #8
Plumber
 
TheEplumber's Avatar
 
Join Date: Jul 2010
Location: North Idaho
Posts: 11,437
Rewards Points: 254
Default

Re: Hot Water Heater: T&P Valve Drain Connected to Cold Water Intake


rotated image-

That appears to be a pressure relief valve. You will need to turn off the main to service it but that is preferred. Pressure valves should not have isolating valves.

Why someone would install this is beyond me... I suppose, as mentioned, it's an alternate method instead of an expansion tank.

As for the relief line discussion. In my state, both must pipe separate to an approved location such as floor drain, exterior (between 6-24") above grade or to the garage floor. T&P may not drain to the pan here.
Attached Images
 
__________________
When posting in forums, letting us know your location will help others give better feedback/advice/solutions to your questions
TheEplumber is online now   Reply With Quote
Old 07-01-2017, 11:49 AM   #9
Newbie
 
Join Date: Jun 2017
Location: Florida, U.S.
Posts: 5
Rewards Points: 10
Default

Re: Hot Water Heater: T&P Valve Drain Connected to Cold Water Intake


Thank you all, for the responses.

I will have to locate the main for future reference, but I'm interested in learning more about the topic. Can anyone provide any links for codes in my area? I know how to google "FL Building Codes", but does anyone have any references that are more "professional" so to speak.

Again, thank you.
rfrankmcm is offline   Reply With Quote
Old 07-01-2017, 03:10 PM   #10
Member
 
Join Date: Feb 2016
Posts: 2,448
Rewards Points: 564
Default

Re: Hot Water Heater: T&P Valve Drain Connected to Cold Water Intake


Years ago every once in a while you would see a relief in the line like that but no relief valve that came with the tank. My guess is someone changed the hot water heater and just left the old valve the way it was and tied in the new relief vale with the same line. They didn't go off with temperature, only pressure so it didn't matter if it was on the hot or cold side
BayouRunner is offline   Reply With Quote
The Following User Says Thank You to BayouRunner For This Useful Post:
rfrankmcm (07-01-2017)
Sponsored Links
Advertisement
 
Reply

Tags
drainage , hot water heater , t&p valve


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Hot water from cold pipes, plumbers are stumped seabeast Plumbing 75 03-31-2015 09:52 PM
water heater drip kdange1 Plumbing 6 10-29-2014 05:26 PM
rumbling pipes and leaking pressure relief valve rogerwright Plumbing 21 04-14-2012 02:35 PM
Drain value dripping MsImmy Plumbing 11 01-29-2011 07:42 AM




Top of Page | View New Posts