How a Coffee Espresso Machine Works Understanding how complex devices function can help them to comprehend and appreciate. You can also choose which device is the best one for you. Two key espresso machine factors are water temperature and pressure. Water needs to be between 195 and 204 degrees Fahrenheit https://wwwcoffeeeuk05549.blogolenta.com/26725201/who-s-the-world-s-top-expert-on-coffee-espresso-machine