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Most all newer water heaters do have a complete bypass. Use the water heater bypass when winterizing and just pull the anode rod to dump the water heater. This is also a good time to inspect that anode rod and replace it if necessary.
BUT, I have an even easier way of winterize. Stay put wherever you are and just before that first freeze head that rig south until the temps stay above freezing. Than each day that it starts getting colder head further south until the chance of freezing no longer exists. Wait out the northern freezing temps in that location, be it in Florida, RGV of Texas or Arizona. DO NOT head back into the freezing north country until the freezing temps have moved on. Usually sometime in May.
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