Dusty R wrote:
I've heard that hot water will freeze quicker than cold.
I don't know if it is true or not, but the theory is that the convection current set up by the heat rising above the open container carries heat away faster than no convection current. The assumption is that when the container has cooled to room temperature, that convection current continues, cooling the liquid faster. I seriously doubt this, but I have no information to refute it. However, the hot water in your system is not in an open container where the heat can rise causing a convection current, so, even if this is true, it wouldn't apply.