My Cornerstone has a bypass circuit to prevent any cleaning efforts from getting into the AquaHot itself. it is pretty obvious. There is an "H" circuit right above the AquaHot. There is a brass shut off valve on the intake water for the AH, and an identical brass shut off valve in the outflow pipe of the AH. Then there is a third shut off valve in the center of the "H" configuration that again is turned off or on. If you want to bypass, I turn off both inflow and outflow valves and turn on the bypass valve between the two. That prevents anything you do in the cleaning from going through the AH.
Now, I dont think that my 15 Anthem had that bypass system in it, but this Cornerstone certainly does. And it is quite obvious just looking at the piping right above the AquaHot case.
Gary and Dee, Zowie and Bowie (traveling cat sibs)
2019 Cornerstone 45B, X15-605hp, Imperial, Spartan K3,
2013 Honda CR-V toad, Demco Excali-Bar II,
Demco Baseplate, Demco Toad Light system, 73 de W5FI