Coffee and Espresso Machines Espresso machines use pressure to force water through finely ground and tamped coffee beans. They create a rich and delicious brew. Experts from the Good Housekeeping Institute recommend models that brew with a minimum pressure of 9 bars in order to get the most efficient extraction. https://www.coffeee.uk/products/tassimo-bosch-happy-tas1001gb-coffee-machine-purple-white