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How a Coffee Espresso Machine Works Understanding how complex devices work will make them easier to comprehend and appreciate. You can also decide which device is best for you. Temperature and pressure of water are two key factors in espresso machines. Water needs to be between 195 and 204 degrees Fahrenheit in order to achieve optimal flavor extraction. The pressure is vital however, if it's too high, the coffee will taste bitter. The ideal pressure is nine bars. Typ