A water cooler or water dispenser is a device that cools and dispenses water. They are generally broken up in two categories: water coolers and bottled water coolers. Water coolers are connected to a water supply, while bottled water coolers require delivery (or self-pick-up) of water in large bottles from vendors. Water coolers connected to a water supply can in a variety of styles, ranging from wall-mounted to bottle filler water cooler combination units, to bilevel units, and other styles. Bottled water coolers often come with 5 or 10-gallon dispensers most commonly found on top of the unit. Pressure coolers are a subcategory of water coolers encompassing water fountains and direct-piping water dispensers (POUs). Water cooler may also refer to a primitive device for keeping water cool.
