Coffee and Espresso Machines Espresso machines make use of pressure in order to force water into finely ground and tamped beans. They create a rich and flavorful brew. Experts at the Good Housekeeping Institute recommend models that brew with a minimum pressure of 9 bars to get the best extraction. https://www-coffeee-uk23398.fireblogz.com/61088171/10-tips-for-coffee-machines-espresso-that-are-unexpected