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How a Coffee Espresso Machine Works Understanding how complex devices function can make them easier to understand and appreciate. It can also help you determine which one 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 to ensure optimal flavor extraction. The pressure is important, but if it's too high, the coffee will taste bitter. The ideal pressure is nine bar. Typ