OK, this is my idea, since it looks like all of you have went different directions. I am looking at separating the system and building a tank with a coil of copper tubing running inside of a custom tank that I can add ice to. Tank will not be pressurized this way, just a place to hold ice. The coil will give me more volume, and should have some cooling as the hot water passes thru the tank....waste of time or not????