For all of its modern looks, these machines did not have an electrically or mechanically operated detergent dispenser. It filled and immediately went into the only wash. To guarantee the 140F wash the heating element came on and there was a thermal hold on the timer motor so that it would not advance until the water was heated to 140F. Westinghouse built in dishwashers had this feature going back to the early 50s. While it was good for getting a hot wash, it took a long time to heat the water. While that was not an inconvenience with a builtin, having the dishwasher parked in front of the sink for up to an hour, just for the wash might be inconvenient. I am sure few, if any, owners would have thought to start the machine on the rinses to warm up the machine before starting again at the beginning of wash which is a remarkably efficient way of warming up the machine ahead of the wash. I have used it with my KD2P.
