Originally Posted by PamJohnZephyr
So it looks like we turn the white valve to redirect the water away from the heater, and close the black valve to keep water from going into the heater on the hot side?
You are correct. In this two valve configuration the white valve is a re-direct to route the supply cold water through the TT hot water lines, and the black valve prevents that flow from entering the hot water heater. If you are winterizing make sure the first thing you do is drain the hot water heater. If your TT is equipped with a Suburban water heater leave the anode rod, which is attached to the 1 1/16" drain plug, out during winter storage. Plug the drain hole with a 3/4" PVC pipe plug available from Home Depot or Lowes. This is a good time to inspect the anode for severe deterioration. Minor pitting of the rod is normal, but when big chunks of the rod are missing it may be time to get a new one. They're not that expensive. If the rod is satisfactory, dry it thoroughly, place in a plastic bag and tuck it inside the water heater door so as not to forget it when you de-winterize in the spring.