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 with the minimum pressure of 9 bars to get the best extraction. Beware https://www.coffeee.uk/products/amzchef-20-bar-espresso-maker-with-milk-frother