Coffee and Espresso Machines Espresso machines make use of pressure to push water through finely ground and tamped coffee beans. They make a rich and tasty brew. Experts from the Good Housekeeping Institute recommend models that brew at a minimum pressure of 9 bars in order to achieve optimal extraction. https://www.coffeee.uk/products/salter-ek3131-barista-style-espresso-coffee-machine-black