We recently had a Watts gas hot water heater installed. We now have a loud repetitive noise coming from the kitchen drain at exactly 1:06 AM lasting about 20 seconds. We do not have a hot water circulation pump installed.
SOURCE: New water heater, shower hot then only warm water in 5 minutes
try this, set the bottom therostat if it is electric , 10 degrees hoter than the top is set , if gas have no ideas
SOURCE: Rheem small 6 gallon water heater vibration/noise
If the water heater is working fine than I would not worry about the function of the water heater. What the problem may be is that some of your WATER LINES HAVE MOVED, AS THEY WERE NOT SECURED PROPERLY. The sound you may have heard was the Copper or PVC(Plastic) lines just getting back comfortable. I Suggest checking that your water lines are secured about every 3 or 4 feet with the proper ancjhor....Metal for metal pipe, copper for copper pipe, etc. Sometime as in my house, pipes are run through a hole drilled through a stud or a piece of wood, usually when hot water is run through this pipe. You can here an expansion of the water line interacting with the pipe expanding, if the hole in the wood was not drilled big enough......Experience of remodeling a very old house.......Joe
SOURCE: Tankless water heater pilot light will not stay on
It is most likely the water valve stuck open, telling the controls to heat water, that it thinks is flowing through it, but without actual flow it overheats. Depending on how comfortable you are with taking it apart yourself, you could open the valve to see if it just needs cleaned out, or if you have a ruptured diaphragm or some other cause.
SOURCE: noisy water heater blower
It may just need a new pump coupling. Fairly inexpensive. I don't think you need to replace the whole burner.
SOURCE: richman gas lp tankless hot water heater. used for
I had the same problem with my Paloma a year and a half after installation...contacted Rheem\Paloma\Richman customer service (800-432-8373) and they recommened a local installer in my area. The technican diagnosed the problem as the "flow control valve"; he managed to get Rheem/Paloma to cover the part under warranty...I only had to shell out the money for the install.
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