Coffee and Espresso Machines Espresso machines make use of pressure to push water through finely ground and tamped coffee beans. They produce a rich and flavorful brew. Experts from the Good Housekeeping Institute recommend models that brew with the minimum pressure of 9 bars to get the most efficient extraction. https://wwwcoffeeeuk98371.blazingblog.com/29850101/5-motives-coffee-machines-espresso-can-be-a-beneficial-thing