Espresso Machines - How to Choose the Right Espresso Machine for You Espresso machines heat the water to near boiling point before forcing it through finely ground coffee sucked tightly inside a portafilter. This results in a concentrated espresso. Many models let you regulate key espresso factors such as temperature https://www-coffeee-uk48660.answerblogs.com/29986760/best-home-espresso-machine-a-simple-definition