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The hot water heater electronics run on 12v therefore it would cause a drain on the battery if left on. This is also true if you run the refrigerator on propane and leave it on and even the furnace runs on 12v too so make sure the thermostat control is off.
When storing for a long time if any device that uses 12v is left on it will drain the batteries if you do not disconnect the batteries. Since 110v is only provided by your converter, when it's not connected to shore power or a generator there is no drain on anything even if a 110v device is accidently left on.
On edit: To answer your questions ff equipped it would be a good idea to disconnect your battery just in case something that uses 12v is accidently left on.
I hope this explains things adequately.
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