This dishwasher may need a "Dragon"....
When I worked at Mr, later Dunkin Donuts we had an older Hobart dishwasher for the coffee cups (this was back when they had a counter). It had a very fast cycle for the cups, which was one wash with a teaspoon of detergent poured on the door and one rinse that I believe was 160 degrees. I don't remember seeing an element in the machine but it did have the "Big Blue Wash Arm". The cavity was smaller than a home dishwasher and there was only one rack. Both the inside and the outside of the machine were stainless steel, and there was only a red button to start it and a temperature gauge.
It had to have incredibly hot water to meet the health code and this was provided by a commercial water heater I called the "Rude Dragon" - It was made by Ruud and sounded like a Dragon. There is no way one could have a Ruud Dragon in a house, the water is so hot as to be unsafe and it would wake everyone up and am sure it would scare little kids. The flue was as big as a furnace, about 8 inches around, and you can tell when it came on with its dragon sound. Sometimes, when the exhaust fan was on and the back door was closed, very hot humid air would come from the draft hood and the flue would have cold air coming down it. When I told the manager, he said "Oh, it's always like that". I thought maybe we could be getting carbon monoxide - and he just blew me off! Could any thing have been done to solve that?
I believe it was set to 180 degrees. On top of the tank was some kind of a mixing valve where the super hot water was mixed with some cold water to make just hot water for the rest of the store. But the dishwasher got the straight super hot water. It even did on good job on things other than cups, I would often place the utensils from the back of the store in there and Hobart removed any mold or soil that was there in just the one "cycle".
Later, Dunkin wanted to create more of a "family oriented" store and felt that the stools created a place for blue collar working men to hang around with their coffee, scaring all the families away. There was also a problem with some men reaching over and pinching the counter girls. So they made their stores with booths and tables and served everything with paper cups so there was not much need for a dishwasher. I'm sure it created more garbage that there used to be, and we already had the fattest squirrels (from our garbage) in the neighborhood.