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How a Coffee Espresso Machine Works Understanding how complex devices operate can make them easier to use and appreciate. You can also choose which device is best for you. Pressure and temperature of water are two key factors in espresso machines. For optimal flavor extraction water temperatures should be between 195 and 204 degrees Fahrenheit. The pressure is vital however when it's too high the coffee will taste bitter. The ideal pressure is nine bars. Types If you're a fan of coffee who l