Coffee makers utilizing a separate reservoir for water are a common appliance in homes and offices. These reservoirs, ranging in size from single-cup capacity to multiple liters, supply the water necessary for brewing. A simple example is a drip coffee maker where the reservoir is filled, and gravity feeds water to heat and then over coffee grounds.
Removable water reservoirs offer several advantages. They simplify refilling, often allowing removal for direct access to a faucet. This design also facilitates cleaning and maintenance, reducing mineral buildup and potential bacterial growth. Historically, coffee preparation required manually pouring hot water over grounds. The evolution to machines with integrated water storage significantly streamlined the process, contributing to the widespread popularity of coffee consumption at home and in the workplace.