How a Coffee Espresso Machine Works Understanding how complex devices operate will make them easier to use and appreciate. You can also determine which device is best for you. Two key espresso machine factors are pressure and temperature of the water. Water should be between 195 and 204 degrees Fahrenheit https://coffeee38508.onesmablog.com/5-lessons-you-can-learn-from-coffee-espresso-machine-70157972