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How a Coffee Espresso Machine Works Understanding how complex devices function can make them easier to use and appreciate. You can also decide which device is right for you. Temperature and pressure of water are two of the most important factors in espresso machines. Water should be between 195 and 204 degrees Fahrenheit to ensure optimal flavor extraction. The pressure is vital, but when it's too high the coffee will taste bitter. The ideal pressure is nine bars. Types If you're a fan of co
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