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How a Coffee Espresso Machine Works Understanding how complex devices function can make them easier to use and appreciate. It can also help you determine which one is the best fit for you. Two of the most important espresso machine elements are water temperature and pressure. To extract the best flavor water temperatures should be between 195-204 degrees Fahrenheit. The pressure is important however, If it's too much, the coffee will taste bitter. The ideal pressure for coffee is nine bar. Types If you're a fan of coffee who prefers a richer more fu