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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 decide which one is right for you. Water temperature and pressure are two key factors in espresso machines. To extract the best flavor, water should be between 195-204 degrees Fahrenheit. The pressure is crucial, but If it's too much, the coffee will taste bitter. The ideal pressure for coffee is nine bars. Types If you're a coffee lover who enjoys a deeper, more full-bodied flav