Door-type dishwashers are designed for “pass-through” operation and can wash a single rack of dishes at a time. They have counterbalanced lift-up doors that are opened simultaneously so you can slide racks in and out from either end. Rinse temperature and interior clearance are two important considerations when selecting the right unit. Door-type dishwashers use two different methods to sanitize dishes during the final rinse phase. High-temp machines use water between the temperatures of 180 and 195° F. Low-temp machines use a chemical additive. Lipstick and grease are not always removed after a single wash in low-temp machines, but the hot water from high-temps can easily melt away these residues. If you do choose a high-temp model, you will want to determine whether or not a booster is included. A booster is a miniature water heater that assures the final rinse water is within the appropriate range.
The interior clearance indicates the height of the opening and tells you the tallest piece kitchen item that can go into it. Since there are upper spray arms, items that are too tall will stop the sprayers from spinning.
Door-type dishwashers come preconfigured for straight-through (left to right or right to left) operation. However, some units can be configured to go in the corner. For corner configuration, the door and handle positions are switched so racks can pass through the “front” of the unit and one of its sides.