Are water hammer arrestors required by code?

The general rule is that water hammer arrestors are required on all quick closing valves. So are water hammer arrestors really required on a 0.35 gpm sensor faucet with hot and cold supply pipes? In my opinion, no, but in strict accordance with the code, yes.Click to see full answer. Keeping this in view,

The general rule is that water hammer arrestors are required on all quick closing valves. So are water hammer arrestors really required on a 0.35 gpm sensor faucet with ¾” hot and cold supply pipes? In my opinion, no, but in strict accordance with the code, yes.Click to see full answer. Keeping this in view, are water hammer arrestors necessary with PEX?If a water distribution system is designed for a maximum flow rate of 8 ft./sec., you will never need a water hammer arrestor for CPVC or PEX tubing. So, if you only install CPVC or PEX tubing, you don”t have to read any further.Secondly, do water hammer arrestors fail? Arrestors usually don’t go bad in 3 yrs. If you have air chambers- yes and you should recharge them. Do it yourself water hammer arrestors (vertical stub pipes) are recharged by draining the plumbing system and then turning the water back on. Also to know is, do water hammer arrestors need to be replaced? Stainless steel constructed (chamber-style) water hammers seldom, if ever, need replacing and are guaranteed for the life of the plumbing. Piston-type water hammer arrestors are mechanical devices and are prone to failure without notice. Replacement intervals are impossible to predict due to variety of factors.Where should water hammer arrestor be installed?Most water hammer arresters are installed on the washing machine valves, but the instructions may recommend connecting them directly to the back of the washing machine in order to protect the washer hoses.

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