Re: Winterizing again ... more questions??

I would have to go along with the dealer. That being the case it would mean that when you open the low point drains and remove the water heater drain plug, and allow both to drain, that is going to remove all or most of the water in the water line you are concerned with. Any residual water even if it freezes is not going to build pressure against the water line and do damage. Of course if you want to give yourself 100% peace of mind you can blow out the lines prior to using the bypass so you're not filling the water heater tank with gallons of anti-freeze.