When is a water hammer arrestor typically installed?

A water hammer arrestor is typically installed near fixtures with high flow rates because these fixtures, such as washing machines or dishwashers, are more prone to causing water hammer—a loud banging noise that occurs when the flow of water suddenly stops or changes direction. The water hammer arrestor acts as a shock absorber, preventing the pressure surge that causes the noise and potential damage to the plumbing system.

Installing the arrestor close to the high flow rate fixture is crucial, as it ensures immediate response to the abrupt changes in water flow generated by those fixtures. While other locations like near the water heater, at the main shut-off, or in the basement may be relevant in certain plumbing setups, they do not directly address the specific issue caused by rapid flow changes at high-capacity fixtures.