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Rondo, I agree with you, there is only a tiny bit of water in the bottom and that leaves plenty of room for expansion and I have had several RVs and done the same to winterize them. None had a "bypass" for the water heater. I just shut off the power to the water heater, drained it and blown out the lines. When I finally started to use RV antifreeze I filled the lines with it and disconnected the feed to the water heater. Never blew a tank doing it that way. and I doubt that the hot water heater bypass would allow any antifreeze into the tank...Dave
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