Question about NORITZ Natural Gas Tankless Water Heater 9.3G/PM

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Vibrating when the heater starts to heat water

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Things to Check:

1. incoming gas pressure (minimum 5" when unit firing)
2. Make sure damper on top of unit isn't sticking
3. check vent length and #elbows versus installation manual specs
4. if above 2000', disconnect high elevation termination

If these all check out, you'll probably need to do a manifold adjustment. Call Noritz for assitance on this.

Posted on Apr 29, 2011

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Posted on Jan 02, 2017

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If the heater is more then a few years old the heat exchanger is probably corroded. Air flow from the blower motor can't squeeze thru the exchanger fins and causes loud vibrations. It can sometimes be cleaned but usually requires replacement of the heat exchanger. If you are not familiar you should definitely have a professional sevice the unit. Continued use in its current state can cause many other issues. Be prepared because the heat exchanger is the most expensive part of the heater and the most difficult to replace

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zdriscoll-

All tank water heaters make some amount noise, clicking and "snapping" sounds, particularly after much of the hot water in tank has been used (like after a long shower) and has been replaced by cold water that is being heated vigorously.

If the noises are accompanied by poor or erratic performance, or obviously if something malfunctions, you may require the services of a repair connection.

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This happen when there is air in the gas line...if the problem is still there after a couple of days you will have to return the unit for an exchange the gas control is giving problem...contact rheem first before making a exchange decision..they will walk you some step first to ensure there is not a problem

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We just installed a Rheem 50 gallon water heater. When you use any hot water a low pitched vibrations occurs that you can hear in the bathroom and bedroom. When the water heater completes the heating cycle...


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We just installed a Rheem 50 gallon water heater. When you use any hot water, a low pitched vibrations occurs that you can hear in the bathroom and bedroom. When the water heater completes the heating...


Listen close near any check valve that may be in the piping system, as well as the pressure relief valve on tank. It may be a check valve rattling, but you normally will only experience that when water is flowing in and out of the system.

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