Point of use water coolers, or bottleless water coolers, are water dispensers that connect directly to the building city water source, filter the water, and heat or cool the water before it is used. This type of water dispenser provides a continuous supply of water since there is no need to replace a bottle, no heavy lifting and no bottle storage. POU water coolers are typically 20 to 70% less expensive per gallon when compared to bottled water service.