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 important espresso variables like temperature and pressure. https://wwwcoffeeeuk39989.blogocial.com/10-startups-that-ll-change-the-bean-to-cup-espresso-machine-industry-for-the-better-65827306