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How a Coffee Espresso Machine Works Understanding how complex devices work will make them easier to use and appreciate. It will also help you decide which one is the best fit for you. Water temperature and pressure are two important aspects in espresso machines. To extract the best flavor the water should be between 195-204 degrees Fahrenheit. The pressure is vital however, when it's too high the coffee will taste bitter. The ideal pressure for coffee is nine bars. Types If you'r