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How a Coffee Espresso Machine Works Understanding the intricate way that devices function can help them to comprehend and appreciate. It will also help you decide which one is best for you. Pressure and temperature of water are two key factors in espresso machines. For optimal flavor extraction water temperatures should be between 195-204 degrees Fahrenheit. Pressure is also important however, too much pressure can ruin the taste of the coffee. The ideal pressure is nine bars. Types If you're a fan of coffee who