And, having the flexibility of many wash cycle options is not only convenient, it can save on energy costs. Performance Features Dishwashing systems vary from the number of spray arms to the size of spray holes. High performance dishwashers generally have two spray arms, and may have a center wash tower. This center tower might add some washing performance, but you'll give up rack space if you choose a model with this feature. The size of spray arm holes is an important performance factor, and smaller is actually better.
Smaller holes emit a faster spray for better scrubbing results.
In general, the cleaner your wash water is, the cleaner your dishes will be. Most manufacturers offer an internal food disposer which virtually eliminates the need for prewashing. Another consideration is the heat of the water circulating in your dishwasher. Some heating systems elevate rinse cycle water temperatures to over 150 degrees Fahrenheit, which helps sanitize your dishes. Durability Features Dish and glass racks are basically metal wires coated with nylon or vinyl.