Check the anode rod at the bottom of the heater tank to see if it has degraded substantially. There have been reports of a hissing noise that can be the result of a worn out anode rod. That would be my first step, anyway.
Bingo
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Bingo and Cathy - Our adventures begin in the hills of WV. We are blessed by our 2014 3850FL Big Sky (previous 2011 3750FL and 2007 3400RL) that we pull with a 2007 Chevy Silverado Classic DRW CC dually.
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