ao smith promax hot water heater makes a banging noise?

Question

ao smith promax 40 gal propane hot water heater makes a banging noise whenever hot water is being used. my house is only 5 yrs old and has made the noise since day 1. I have installed an expansion tank on the cold water supply line at the water heater the ao smith web site suggested to replace the anode with a magnesium anode that helped for a week any ideas??

Answer 1

It sounds like you have made all the right steps so far, the only other thing is to make sure that the burner is properly adjusted (not overheating). Check the t&p valve if you can safely do so, to make sure it is operable and that you don’t have steam in the top of your tank.

Also if you replaced the anode, go ahead and drain some water off the drain tap to make sure you have no aluminum residue from the original anode.

I will assume that you have consistent water pressure in the 60-65 psi range, and that all the water lines are strapped.

AO Smith is a good company, and they stand behind their products, I would contact them, like I said you have done all the things that would be in line with this sort of problem. AO may want to send out a factory tech. to look things over.

Answer 2

Ao Smith Expansion Tank

Answer 3

Home Depot;: page 97 of there book1-2-3-----------water hammer
buy a commercial water hammer arrester,big name for a small pipelike device.It absorbs shock. Sometimes there can be a burr in pipe where the plummer didn"t deburr pipe when joint was made.Maybe this info will help,with burr it would be constant noise while water is running.The Hammer would be noticed when water is turned off