How a Coffee Espresso Machine Works Understanding how complex devices work can make them easier to use and appreciate. You can also determine which device is the best one for you. Temperature and pressure of water are two key factors in espresso machines. Water needs to be between 195 and https://www-coffeee-uk00081.techionblog.com/29835107/looking-for-inspiration-try-looking-up-coffee-espresso-machine