The hose from the tank to the pump goes directly to the pump, and from the pump to the cold water line. (Just like in your house, where the incoming cold water line feeds both the water heater and your cold water faucets.) Sounds to me like someone at the factory screwed up big time when they put the water heater in and placed it on the hose, resulting in a squashed hose.
Happy Camping! ///// Richard D.
2006 4x4 Ford 250 SD / 2007 Flagstaff 827 FLS
One very patient wife and one furry child who travels with us. Forty-two years of trailering and camping, and I still have a blast.