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 06-18-2008, 08:42 AM   #1
A "Handy Husband"
 
rjniles's Avatar
 
Join Date: Feb 2007
Location: South Carolina Low Country
Posts: 4,109
Rewards Points: 2,128
Default

Hot water heater expansion tank?


My local water company installed a new meter and a check valve on my incoming water line. Now my TP valve weeps; Older house without an expansion tank. Because of the check valve I know I need to install an expansion tank. The installations I have seen have the tank on the cold water inlet. Due to my piping configuration, it would be hard to install on the cold side and a snap to install on the hot side. Question: is installation on the cold side neccessary or does it make no difference?

rjniles is offline   Reply With Quote
Old 06-18-2008, 08:50 AM   #2
Doing it myself
 
Alan's Avatar
 
Join Date: Apr 2006
Location: Crescent City, CA
Posts: 3,762
Rewards Points: 2,024
Send a message via AIM to Alan Send a message via MSN to Alan
Default

Hot water heater expansion tank?


I've seen them on the hot side once before, but we always install them on the cold. I'm not honestly sure why, though. Hopefully someone else will pipe in and learn me.

__________________
Journeyman Plumber
Alan is offline   Reply With Quote
Old 06-18-2008, 09:27 AM   #3
Journeyman Plumber
 
Ron The Plumber's Avatar
 
Join Date: Jun 2006
Location: Eugene, Oregon
Posts: 1,994
Rewards Points: 1,000
Default

Hot water heater expansion tank?


If instructions say cold side then thats where is needs to go, however I seen them on the hot side also, only thing is, if you don't follow installation instructions, and it fails, you void the warranty of said product.
__________________
Fix it right the first time, so you won't have to fix it a 2nd time.

2008 Oregon Specialty Plumbing Codes
Ron The Plumber is offline   Reply With Quote
Old 06-21-2008, 10:53 AM   #4
Licensed Master Plumber
 
mstplumber's Avatar
 
Join Date: May 2008
Location: Atlanta, GA USA
Posts: 211
Rewards Points: 150
Default

Hot water heater expansion tank?


Cold side is best. I have seen a few instances where a tank installed on the hot side caused the heated water to be pushed back into the cold side. (That one was fun to diagnose). The tank works by compressing an air bladder to absorb excess water pressure. When a cold faucet was opened the pressure was relieved and the bladder expanded, forcing the extra water back through the path of least resistance, the water heater. This in turn forced hot water back up the cold inlet to the water heater. This is admittedly very rare and all the planets have to be in line for it to happen but I have never known of a problem with the tank installed on the cold side.

One other thing. If at all possible, install the tank with the opening facing down. This will help prevent sediment and scale from collecting in the tank and reducing it's effectiveness.
__________________
Mstplumber

Check out my goofy video for my new toilet repair book.

Last edited by mstplumber; 06-21-2008 at 10:54 AM. Reason: typo
mstplumber is offline   Reply With Quote
Reply


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
How to install an expansion tank in my hot water furnace? DanBress HVAC 18 10-08-2008 03:57 PM
No water pressure in my pressure tank GordH Plumbing 6 05-18-2008 11:19 AM
No Expansion Tank for Water Heater vasanvasan Plumbing 4 12-13-2007 11:16 PM
Periodic release from (I think) the T&P valve on the water heater alexz Plumbing 3 08-15-2006 10:31 AM
Draining a hot water heater singforsupper Plumbing 1 06-07-2006 06:01 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.