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How Does Machine Espresso Work? The machine espresso is made using precise pressure, as well as a filtering system that is awe-inspiring to create the coffee you love. But how exactly does it work? To make an espresso hot water is pushed under pressure through finely ground coffee. The process is similar to making drip coffee, however the main difference lies in the pressure. The Head of the Group The group head is the portafilter that you place in the espresso maker when making it. It disperses water into the portafilter, and controls the pressure of the extraction. There are a variety of types of group head each with its particular advantages and drawbacks. Some are designed for stability of temperature while others are built to handle pre-infusion. Others are made to control the lever. There are also some that come with a range of features, like the E61, which is to be the most popular among baristas due to its capacity to offer multiple perks in one package. As you can see from the above photo, the group head is equipped with several notches. You place your portafilter in these notches, then twist the head to secure it. There is also a gasket made from rubber which is located inside the notches, which helps create an airtight seal after inserting your portafilter into the machine. The notches permit an exact placement of the portafilter. This is vital for an accurate extraction. In addition to allowing you easily insert your portafilter, the group head is responsible to ensure that the temperature remains even. It does this by cycling hot water through the brew basket, and around the portafilter, making sure that it is always at the correct temperature to extract. This is important because even a few degrees can be the difference between a excellent and great espresso. The Pump The motorized pumps that are used in rotary espresso machines supply the nine atmospheric bars of pressure required to extract espresso. This is different from manual piston machines which use a lever. This pressure is generated by pumping water through a heat-exchanger and then through the ground coffee. Pumps are generally less expensive than piston-driven machines and tend to last longer. However, both types of machines could get damaged through overuse and lack of cleaning. They also make mechanically complex which can result in costly prices for even the simplest models. Some espresso machines use steam pressure instead of a pump to brew espresso. This can cause over-extraction because the boiler that produces steam also heats the water to boil. In addition these machines typically have to rebuild 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 vibrating disc to create the pressure, and the rotary model pushing hot water through the grounds under high speed. Both models can produce an excellent espresso, however the rotary pumps are quieter, and more durable than vibration pumps. The Boiler The boiler is the element that heats water to an ideal temperature for extraction. The steam created will eventually reach the portafilter, which contains the espresso coffee grounds. The steam is then channeled into the cup. During this process, the steam creates pressure that pushes through the coffee grounds. This results in a layer of crema on top. This is a hallmark of a good espresso. There are three types of espresso makers. They differ in the type of pump they use and the degree of heat that the espresso is. There are also different ways in which the brew could be controlled as well as the size of the cup the maker can create. The earliest espresso machines were steam type. The earliest espresso machines were steam types. coffee and espresso machine led to the coffee tasting bitter and burnt. The modern espresso machine was designed by the Milanese producers Luigi Bezzerra & Desiderio Pavoni. The most well-known espresso maker is a semi-automatic device that has an electric pump. These are what people imagine when they imagine an espresso machine. Semi-automatic machines require you to grind and tamp the beans by yourself The pump, however, regulates the water flow and pressure. This is an excellent compromise between human touch and the mechanised accuracy. The Filter Typically, espresso machines have a filter to separate out the grounds of the coffee as they go through the hot water. The filter is also an essential element of the machine's temperature control, as it prevents overheating. Filters also aid in flavor as it allows for a longer flowering phase. This lets the beans release their flavor and also allows for better extraction. It is important to remember that even the finest filter can produce a bad cup of coffee. The quality of the beans, and the extraction process remain crucial. It's in this area that the magic takes place. This is the reason why espresso tastes so good. The grouphead (also called the brewhead) is where you put the portafilter – the thingy that you put the grounds of coffee into when making espresso. In the steam-driven espresso machine hot water is heated in an airtight container to create steam. This then pushes the hot water through the grounds under high pressure. These kinds of machines tend to be cheaper and easier to maintain than pumps-driven models. They are however limited in their ability for creating the ideal conditions for brewing since they only operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars. In recent times, espresso machines powered by compressed air-pump are becoming increasingly popular. They make use of an air compressor to push hot water across the ground and are more mobile than steam-driven electric espresso machines.