My New CraftMaster water heater makes noise
by Dan Sanders
(Scotts Valley, CA)
I installed this water heater about one month ago. From day one when you open the hot water on any faucet after about 20 seconds there is a loud hum from the pipes. It is so loud my neighbors hear it.
As I said, all faucets cause this, kitchen, bath room faucet and shower, and the washing machine.
I did up the size of the heater from 20 to 30 gallons. None of the pipes were changed except for new nipples on the water lines that connect to the heater.