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How Does Machine Espresso Work? The machine espresso is made using precise pressure, as well as a filtering technology that is amazing to create the coffee you enjoy. How exactly does it work? Espresso is produced by pushing hot water under high pressure through finely ground coffee. The process is similar to making drip coffee but the major difference is in the pressure. The Head of the Group As the name suggests the group head is where you place your portafilter while brewing espresso. It is responsible for dispersing water into the portafilter before controlling the pressure that results from the extraction. There are numerous kinds of group heads each with their own advantages and disadvantages. Some focus on temperature stability, others on pre-infusion options, and others are designed to control the lever. There are also some that include a mix of features, like the E61, which is considered to be the most popular among baristas due to its capacity to offer multiple benefits in a single package. As you can see in the photo above the group head is made up of several notches where you place your portafilter before twisting it by hand to secure it. A rubber gasket is located within the notches to create a seal while you insert your portafilter. The notches allow for the precise placement of the portafilter. This is essential for an efficient extraction. The group head does not just allow you to place your portafilter easily however, it also keeps the same temperature. It does this by circulating hot water through the brew pan and around the portafilter, making sure that it's always at the right temperature for extraction. This is crucial, since even a few degrees can be the difference between a good and great espresso. The Pump Contrary to manual piston machines which rely on a lever to pressurize water, rotating espresso machines rely upon motorized pumps to provide the nine atmospheric bars of pressure necessary to extract espresso. The pressure is built by pumping water through a heat exchanger and then through the ground coffee. Pumps tend to be less expensive than piston-driven machines, and tend to last longer, although both types of machines may become damaged due to excessive use and poor cleaning. They also make mechanically complex and can lead to an expensive price for even the simplest models. Certain espresso machines utilize steam pressure instead of a pump to make espresso. This could lead to over-extraction since the boiler that produces steam also causes the water to boil. In addition the machines often have to restore their pressure between cups, which takes time and energy. Many espresso machines utilize either a rotary or vibration pump, with a vibrating model using a rotating disc to create the pressure, and rotating models that push hot water through the grounds under high speed. Both machines can produce excellent espresso, but rotary machines are more stable, quieter and less likely to fail. The Boiler The boiler is the component that heats water to an ideal temperature for extraction. The resultant steam then reaches the portafilter, which contains the ground espresso and is then funneled down into the cup. During this process, steam creates pressure to push through the grounds of the coffee. This creates a crema on top of the espresso. This is the hallmark of a good espresso. There are three kinds of espresso makers, and they differ in the kind of pump they use and how hot the coffee is. There are different ways that the brew can be controlled, as well as the size of the cup the machine can make. The first espresso machines were steam-type. The first espresso machines were steam-type machines. The coffee tasted bitter and burnt. This is the reason Milanese producers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine. The most well-known espresso machine is a semiautomatic one with an electric pump. When people think of espresso machines, they imagine these machines. Semi-automatic machines require you to grind and tamp the beans on your own, but the pump regulates the flow of water and pressure. This is a great compromise between the human touch and mechanized accuracy. The Filter Espresso machines usually use filters that separate the grounds of the coffee from hot water. The filter is also a vital component of the machine's temperature control, as it helps prevent overheating. It also aids in flavor, as it allows for a longer bloom time. This helps the beans to release their nuances and gives an opportunity for better extraction. It is important to keep in mind that even the finest filter can produce a bad cup of coffee. The quality of the beans and the extraction process remain vital. Highly recommended Web-site is where the magic happens. It's what makes espresso taste great. The grouphead, often referred to as the brewhead, is where the portafilter (the container you place the ground coffee into) is located when you're making espresso. In a steam-driven espresso machine, hot water is heated in an airtight container to create steam, which then pushes the hot water through the grounds at a high pressure. These kinds of machines are typically less expensive and simpler to maintain than pumps-driven models. They are however limited in their ability to create the ideal conditions for brewing as they only operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars. In recent years, espresso machines powered by a compressed air compressor have become increasingly popular. They use an air-compressor to push hot water across the ground, and are more mobile than steam-driven electric espresso machines.