Coffee and Espresso Machines Espresso machines make use of pressure in order to make water into finely ground and tamped beans. They create 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 best extraction. https://www.coffeee.uk/products/amzchef-20-bar-espresso-coffee-machine-with-lcd-panel