Water Hammer (Domestic water)

Yellowlab · January 16

HH Pros:

Experiencing water hammer under the following conditions:

-Shower only;

-Individually controlled hot and cold water faucets;

-First open cold water supply (min flow)…no hammer;

-Next open hot water supply (moderate flow)…initially NO hammer. However, after less than one minute experience hammer. (quite visible vibrations at piping leaving gas hot water tank/heater);

-Finally…adjust flow at shower…hammer stops.

ANY and ALL input will be appreciated.

TY!

hot_rod · January 16

Could be a loose washer or disc inside the shower valve.

Yellowlab · January 16

Oh wow…was not aware. I will replace stems/washers. THANKS

hot_rod · January 16

Here is what a typical two handle faucet or tub/ shower valve stem assembly may look like.

If the screw holding the washer becomes loose, or the rubber washer deteriorates, then that washer will chatter on the stem. Usually when you just start to crack open the valve.

It is best to buy a kit that includes the new seat that the washer seals against. Some rebuild kits include the complete stem assembly and seat. That way all the washers and o-rings around the stem are new.

Some ACE hardware stores carry an assortment of rebuild kits, Plenty of online sources for faucet rebuild kits.

Screenshot 2026-01-16 at 11.09.26 AM.png

Yellowlab · January 29

Hot Rod - finally obtained two new cartridges…no more water hammer. Problem fixed!

Thank you once for generously sharing your knowledge.

Much appreciated.

Water Hammer (Domestic water)

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