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Drip Coffee Machines The convenience of drip coffee machines as well as their ability to brew several cups at a time makes them popular. Hot water and gravity are utilized to slowly extract flavor from the beans. They typically have a glass or a thermal carafe. The best drip coffee machines have the following features Showerhead that evenly distributes the water evenly over the grounds to ensure consistent extraction, and a temperature of the water that is optimal for flavor extraction (198 to 202 degr