I agree, a HWH by-pass is a nice feature and comes in handy...., especially should you have to address an issue with the HWH while camping and maintaining water supply.
Just a FYI........:
2006 Jayco PUP Owners manual winterizing procedure w/o by-pass (p. 96 & 97):
http://www.jayco.com/files/downloads...ilename_94.pdf
2014 Jayco PUP Owners manual winterizing procedure w/By-pass (p. 8-5):
http://www.jayco.com/files/downloads...lename_201.pdf
In the 2014 Jayco owners manual, note the Jayco recommendation in respect to RV antifreeze and the associated HWH.
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)