Good for when the water heater is at the other end of the ho
HOW? This machine fills for the prewash without the motor running then sits and heats the water. Once the water is heated, it throws it against room temperature dishware. I can tell you from measuring the temperature with a thermometer that the water temperature is reduced to around 100F by the time it drains. Then you have the water sitting in the pipe and cooling while the machine has heated the water and gone thorugh the prewash and that cooled water is what goes into the next fill. Even if it cleans as well as the 20, it cannot rinse as well with only one after rinse. The residual alkalinity from inadequate rinsing is what attacks the racks over time.
And, Jon, the cycle is different from the 20.