Espresso Machines - How to Choose the Right Espresso Machine for You Espresso machines heat water until near boiling and force it through a tightly packed, finely ground coffee in a portafilter to extract an espresso that is concentrated. Many models allow you to control key espresso factors like temperature https://wwwcoffeeeuk95674.shotblogs.com/10-amazing-graphics-about-bean-to-cup-espresso-machine-43895182