Water heater doesn t work on 12v

Good morning , we have a rinker 2006 390, just want to confirm , the water heater should work both when we are connected at the dock of our marina (120v) and when we are not (12V). , right?  We noticed that it does not seem to work whne we are not connected. Is this normal? If not any suggestion why it might not work?

thanks in advance

Sandra and Stephane

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