I am looking to use as cip for tanks as well and think the pump pressure would be needs for the tanks. This is why I want to add the hot water rinse supply prior to the pump inlet. Does that make sense?
Do you just leave the pump running while you are running the tap water or do you shut it down? If left running have you had any problems with the pump?
could you use a third input to the pump which is water directly from in line hot water heater. Would the flow be adequate or would you need to fill a third vessel and drain by gravity? You could have a combination or 2 three way valves into the pump thus supplying caustic or rinse water or...