Good question, I know on my journey there is a valve to shut off this flow of water to the water heater possibly on yours also.
My concern would be, if the tank got hot and tripped the 110V overheat breaker located at the rear of the heater. Its a bugger to get to.
But would a diesel running a 190deg temp overheat it. i think not. ?????
2002 Winnebago Journey DL 34 ' Cat. 330 hp
Great wife and Charlie, Cavalier King Charles Spaniel RIP