Thanks guys for the explanation and the photo. That photo really helps out.
Now I understand where the domestic water leak had come from on my original Aqua-Hot unit in my 2002 Windsor, actually built in 2001.
I had to have a rebuilt unit installed in 2005/06 which came from the factory in Colorado. I am sure that the rebuilt one I have now has an internal domestic water loop and hence why I use the Sierra propylene glycol mixture.
Dr4Film ----- Richard
2002 Monaco Windsor PBT 40Ft. (R HOME) - 30Ft. 2006 Pace Trailer (R JUNK). Trailer Has 06 VUE (R TOWD) 04 Victory Alen Ness Edition (R RYDE). Full-Timer for 14 Yr's BUT now a Part-Timer. Cummins ISC-350 With Banks Power Pack and Upgraded PRXB PacBrake.
Winter Home in Flagler Beach FL - Now Staying in Dansville NY for the Summer.