Undercounter Dishwashers are different from other dishwashers in that they are the only dishwashers suitable for domestic use. These dishwashers are also available in two types: ultrasonic under-counter dishwashers and spray under-counter dishwashers.Undercounter Dishwashers can also be used as a dishwasher storage cabinet, so that the washed dishes can be placed directly in the dishwasher and taken out for use next time.