Bunn U3 Automatic Twin Electric Coffee Urn Brews 16.3 to 18.8 gallons of perfect coffee per hour. Unique design assures extremely low evaporation loss to maintain the brew at its flavorful peak. Large water tank holds over 20 gallons. Draw off hot water during brewing cycle without affecting coffee quality. Half batch option. Top mounted components for ease of service. All stainless steel construction.