Do Water Hammer Arresters REALLY Work?

[washerdude]

We notice that with our 1 year old duet, whenever we do laundry there is lots water hammer. Especially when the hot and cold valves switch rapidly on warm. We have decided to opt out on water hammer arresters. Has anybody used these? And if so how big of a difference have they made? Feedback is appreciated!

 

[iej]

Yes they do work - they basically have a spring loaded piston that lifts when the water 'hammers' and absorbs the shock.

 

[nmassman44]

I have them on my LG washer and they work beautifully. We have very high water pressure here and without them my toilet valves would be damaged and faucets as well, not to mention the water heater. I spent $20 for the pair and they are very easy to install and work like a charm. My thinking I would rather spend the money on those than spend gawd knows what on new toilet valves and whatnot...

 

[gelaundry4ever]

Yes they do.

My mom's lg washer has them. They have been installed from day one since 2007.

 

[ea56]

I too have very high water pressure and have them installed on the inlet valves on the back of my LG FL. They absolutely stop the water hammer. I bought Sioux Chief Mini Hammer Arrestors at Home Depot for $9.99 each, cheap insurance to prevent potential damage to the plumbling. I highly recommend them

 

[washer111]

Short Answer: Yes

Long Answer: See Below

 

There was an ancient one attached to the old solar water heater on our roof - as the pipes running from its position, through the hole and eventually to the "distribution point" near the bathroom aren't secured that well nearest the water heater. 

 

I always thought it was some sort of "vintage pressure-relief valve," having an appearance not too separated from a steam-whistle. Our plumber decided to remove it when we got the new water heater, and I enquried as to what it actually was. "Water hammer arrestor" was the answer. 

 

Since it has been removed, anyone (particularly the kitchen/laundry) slamming taps makes a noticeable "THUNK," on hot or cold, whereas it did not before.

Even being a 30+ year old plumbing item, it still worked exceptionally whilst it was fitted.