Coffee and Espresso Machines Espresso machines make use of pressure to force water through finely ground and tamped coffee beans. They make a rich and delicious brew. Experts at the Good Housekeeping Institute recommend models that brew at a minimum pressure of 9 bars to get the most efficient extraction. https://coffeeeuk99686.articlesblogger.com/52846961/the-reasons-to-focus-on-enhancing-espresso-machine