I'm with Max. It doesn't appear that this is consistently repeatable. And, lest anyone thinks this will save them money, thinking that since hot water freezes faster than cold, and thus you start making all your ice cubes with hot water, that is absolutely untrue. That would definitely be in violation of conservation of energy, not to mention that you would be heating the water first, then cooling it down, so you would be doubly wasting energy.
-- Blue skies. Dan Rossi Carnegie Mellon University. E-Mail: d...@andrew.cmu.edu Tel: (412) 268-9081