Espresso Machines - How to Choose the Right Espresso Machine for You Espresso machines heat the water to near boiling point, then force it through finely ground coffee packed tightly into a portafilter. This creates a concentrated espresso. Many models let you control key espresso factors like temperature and pressure. https://coffeee-uk26624.blogsmine.com/30292388/best-home-espresso-machine-a-simple-definition