Hey there jizmo3...bikendan is right, you really only need to use those low point drains if you are winterizing or un-winterizing. There really isn't a need to drain your water supply lines when you are done camping unless you are trying to avoid a freeze.
The hot water bypass can be treated the same as well, you should only need to open it and close supply and return valves on your HW heater when you are getting ready to press your water system up with anti-freeze (the pink stuff just for this RV process) as a winterizing effort. On my 233 (a 2013 model year) my HW heater is front right under the couch, when you flip the back over to make the small bed, you can lift the seat cushion up and then see all three valves right behind the HW heater package....mine is surrounded by a styrofoam shell.
I also removed my inline water filter for the same reason as dado39 because it unscrewed itself and poured water all over our brand new 233S! It was located front left behind the cabinet door held shut by the extra hinge instead of a door nob and clasp.
Ed & Chris
Josh & Jaclyn
2012 Suburban LTZ
2013 Rockwood Roo 233S