WyoTraveler wrote:
How about the theory that cooling hot water freezes quicker than cooling cold water?
that is true for systems where evaporation helps to cool the water faster than just conduction and radiation losses. as hot vapor leaves the surface of the water, it takes heat with it... so hot water in the ice cube tray freezes faster than cold, but only a little.
rv plumbing system is a closed loop more or less, I guess you would have some evap in the holding tank, but OP states the tank is insulated, so the heat would be retained in the air inside the tank and not lost from the system completely.
