Coffee and Espresso Machines Espresso machines make use of pressure to force water into finely ground and tamped beans. They make a rich and flavorful brew. Experts from the Good Housekeeping Institute recommend models that brew with a minimum pressure of 9 bars to get the best extraction. Beware of https://www.coffeee.uk/products/kotlie-espresso-coffee-machine-with-milk-frothing-wand