These countertop pan warmer units can hold a number of configurations of pans. A full size unit could hold one full-size pan, two half-size pans, three third size pans or combinations. Pan depths vary, choose by depth of your warmer and leave at least an inch of space for water. The advantage of this type of warmer is the ability to keep certain foods together due to space constraints. Many food items are able to be displayed at one time on a buffet line or in a cafeteria. This design also promotes buffet use where customers are viewing their food to choose what they want. In addition, a countertop warmer may be used in back of the house to hold prepared foods. This saves space and helps staff quickly plate prepared entrees, sides etc.