Coffee and Espresso Machines Espresso machines make use of pressure to push water through finely ground and tamped coffee beans. They make a rich, delicious brew. Experts from the Good Housekeeping Institute recommend models that brew at the minimum pressure of 9 bars in order to get the best extraction. https://www.coffeee.uk/products/gaggia-ri8423-espresso-machine-freestanding-manual-white