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 sucked tightly into a portafilter. This creates a concentrated espresso. Many models let you regulate important espresso variables like temperature and pressurization. https://coffeee41931.blogdanica.com/29764003/three-greatest-moments-in-best-home-espresso-machine-history