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How a Coffee Espresso Machine Works Understanding how complex devices function will make them easier to use and appreciate. It can also help you determine which one is the best fit for you. Pressure and temperature of water are two key factors in espresso machines. For the best flavor extraction water temperatures should be between 195-204 degrees Fahrenheit. Pressure is also important, but too much can ruin the taste of the coffee. The ideal pressure is nine bars. Types I