12/110 volt water heater problem - SailNet Community
 
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post #1 of 6 Old 07-15-2006 Thread Starter
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12/110 volt water heater problem

Seems like our 12 gal hot water heater is acting up...warm water only from 110 side. Is this the symptom of the element going out, are they replacable, it looks like a big socket would unscrew it outof the tank ????? Any way of testing element before removal ? Would appreciate 101 lessons on water heaters Thanks
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post #2 of 6 Old 07-16-2006
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A HWT that is producing NO heat, almost always indicates a break in the electrical circuit; caused by either a heating element failure or a faulty connection.
Test for the presence of 12V at the element terminals.
Test for continuity on the (disconnected) element (high resistance = ok, infinate resistance = broken).
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post #3 of 6 Old 07-16-2006 Thread Starter
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Thanks

thanks for th einfo, I ran a continuity test on tge element and there is none must be broken inside.Are these the same elements that Home Depot sells, or do I need to go back to Superstor for the element ????
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post #4 of 6 Old 07-17-2006
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I doubt that the element is the same as one Home Depot stocks, as the water heaters generally used in houses are larger than the one on your boat. Also, I do believe that the design of the heater element will have to be slightly different if it is designed for 12V versus 120v—especially given that it sounds like you have two heater elements in your water heater—you did say it works under AC, but not 12 VDC.

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post #5 of 6 Old 07-17-2006 Thread Starter
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I just realized what I said 12/120 NOT try 110/ engine anyway the help from above answered my problems, bad element, new one ordered thanks guys
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post #6 of 6 Old 07-17-2006
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Umm... aren't most engine based hot water heaters not using an element but using a heat exchanger to transfer heat from the engine's cooling system to the water via the heat exchanger? I would really recommend you check the system before replacing a hot water heating element that may not be bad...because if the system uses a heat exchanger for when it is operating off the engine, the heating element is most likely not going to be live at the time... the engine's cooling system gives of more than enough heat to provide hot water without it.

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