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I winterized my 07 on 31 Jan and moved into southern PA. The temp got down to zero a few nights and below freezing for over half the month. I was worried about that same issue. I can not explain how it works but the lines did not freeze or show any sine of damage. This is definitely a question for the factory tour.
I thought about putting a bypass valve at the hot water heater too. Right now I am going to trust the engineer that designed this one since it seems to work.
Hope this helps.
Good luck and safe towing.
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