Drip coffee makers include a one way valve to control a flow of fresh water from a reservoir into a heating conduit via a cold water conduit. Water is heated in the heating conduit, and then proceeds into a hot water conduit, and hot water is thereafter spread over coffee grounds by a showerhead. Heating water causes formation of steam and pressure in the hot water conduit. The one way valve prevents the heated water from moving backwards towards the reservoir, helping force the water onward through the system towards the coffee grounds in the filter basket. Once the heated steam and water move out of the heating conduit the one-way valve is able to open and new fresh water enters. The one-way valves use heavy metal or steel valve stoppers. The stoppers may be spherical, columnar, bullet shaped, or a pair of spheres either loose or fused.
