Dishwasher can be in high temp. or lower temp. The difference between this two type of dishwasher because high temp use 82C or higher temp. to kill the bacterica while the low temp use sanitizer to kill the bacterica. Both type go by cycle of approx 52 sec and use fixed volume of chemical and water.
Glass washer designed to wash beer glass and the rinse water keep on running in with sanitzer when the turn-table or conveyer is running. The beer glass have to be manually brushed with chemical water then go through the dishwasher for sanitizer only. The rinse water flow back to the wash tank but will go away when over flow. I guess the wash temp is low because too much rinse water go back to the wash tank even the heater in the wash tank keep working.
According to the information above, running cost of a glass washer is higher that a dish washer. As well, glass washer got lower cleaning and sanitizing standard.
I will eat in those place where they use proper way of cleaning chemical and sanitizer.
I found a "canteen" on 1/F on Westminster Hwy in Richmond (bottle depot on the ground floor) using a glass washer to wash the tea mug and cups leaving unexpected "stuff" . I can see that their boss hired enough hands to do run th business but they might not have proper idea how to clean the cook/eat wares