Single-cup coffee makers brew one cup of coffee at a time. Drip coffee makers brew small batches of coffee at a time serving multiple people at one time. Coffee brewers with pourover water reservoirs make large quantities of coffee. They do not have a direct water line connection and the reservoir must be manually refilled with water before brewing. Coffee brewers with direct water line connection make large quantities of coffee and do not need to be manually refilled with water before brewing. Automatic espresso machines produce shots of concentrated coffee with the press of a button. Coffee urns and percolators brew, warm, and dispense large quantities of coffee. Warmers heat carafes filled with coffee keeping contents warm for hours.