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How a Coffee Espresso Machine Works Understanding how complex devices work can help them to comprehend and appreciate. It can also help you decide which one is the best fit for you. Two important factors in espresso machines are water temperature and pressure. Water needs to be between 195 and 204 degrees Fahrenheit to ensure optimal flavor extraction. Pressure is also important however, too much pressure can ruin the taste of the coffee. The ideal pressure for coffee is nine bar. Types If