Glacial UnderCabinet Professional Water Cooler with Hot & Cold Fits under standard 18 height kitchen cabinets. Saves valuable floor and countertop space. Glacial Chill technology uses a ring of ice to keep water at a steady temperature just above freezing, making a refreshingly chilly glass of water. Produces 1.6 gallons of icy cold water per hour. HotBoost technology injects preheated water into the hot tank, maintaining a very high average temperature. Produces 1.4 gallons of piping hot water per hour. Professional Grade compressor technology turns on about 30 times less than the average commercial grade cooler; which often starts failing after a year or two of use. Exceeds Energy Stars requirements, yet produces more cold and hot water than normal commercial grade coolers.