Do Water Hammer Arresters Really Work? - Plumbing - DIY Home Improvement | DIYChatroom

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


Thread Tools Display Modes
Old 10-25-2009, 09:52 PM   #1
Wire Chewer
Red Squirrel's Avatar
Join Date: Jun 2009
Location: Ontario, Canada
Posts: 3,274
Rewards Points: 2,126

Do water hammer arresters really work?

My washer is very rough on the water pipes, it has very rapid on/off solonoid that has no mercy for the piping. Every time it cycles all the pipes in the house shake and I'm afraid one of these days one will just rip loose and flood the whole basement.

I'm considering installing water hammer arresters near the taps for the washer. Do those really work well, an dis there any consideration when installing them?

I've never done any pipe soldering before, but I'm willing to learn.


Red Squirrel is offline   Reply With Quote
Old 10-25-2009, 09:55 PM   #2
You talking to me?
nap's Avatar
Join Date: Dec 2007
Location: sw mi
Posts: 7,551
Rewards Points: 6,290

Do water hammer arresters really work?

yes, they work. No, I do not know how to size them. Soldering is a piece of cake.


nap is offline   Reply With Quote
Old 10-25-2009, 09:59 PM   #3
GC/Master Plumber/Mech
Join Date: Feb 2009
Location: Hays, KS
Posts: 1,477
Rewards Points: 514

Do water hammer arresters really work?

Arrester Sizing Table
Use this table to determine how many fixture units you have,
choose the arrester with the corresponding fixture unit rating
C.W. means cold water line, H.W. means hot water line
FixtureType of
Supply ControlFixture UnitsPublicPrivateTotalC.W.H.W.TotalC.W.H.W.Water ClosetFlush Valve10101066-Water ClosetFlush Tank55-33-Pedestal UrinalFlush Valve1010----Stall or Wall UrinalFlush Valve55----Stall or Wall UrinalFlush Tank33----LavatoryFaucet21-1/21-1/2111BathtubFaucet42321-1/21-1/2Shower HeadMixing Valve423212Bathroom GroupFlush Valve Closet---883Bathroom GroupFlush Tank Closet---663Separate ShowerMixing Valve---212Service SinkFaucet333---Laundry Tubs (1-3)Faucet---333Combination FixtureFaucet---333
RULE 1: Branch Lines of 20 Feet or Less
The Hydra-Rester should be placed at the end of the branch line between the last two fixtures served as shown (below).
RULE 2: Branch Lines Over 20 Feet
An additional Hydra-Rester (Y) should be placed as shown (below). The additional unit should be placed at the midpoint of the run longer than 20 feet. The sum of the fixture unit ratings of units X and Y combined, should be equal to or greater than the demand of all branches.

A link

You can install the arrestor at the appliance also
John Wayne once said "Life is tough and it is even tougher if you are stupid"

Tempstar and Trane Dealer

Last edited by Plumber101; 10-25-2009 at 10:04 PM.
Plumber101 is offline   Reply With Quote

Thread Tools
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
loud jackhammer-like noise from hot water pipe omar Plumbing 15 01-08-2012 02:53 PM
bad valve washing machine?? drdon51 Plumbing 6 06-29-2009 02:02 PM
water hammer TStan Plumbing 1 02-03-2009 10:28 AM
Is 1/2 Pex more restrictive than 1/2 copper? twilightcall Plumbing 19 06-24-2008 08:32 AM
Low Water Pressure Eagle2 Plumbing 5 05-28-2008 11:29 PM

Top of Page | View New Posts