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How Does Machine Espresso Work? The machine espresso uses precise pressure and filtering technology that is amazing to make the coffee you enjoy. 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 but the difference is in the pressure. The Head of the Group The group head is the portafilter is inserted when you are making espresso. It is responsible for dispersing the water into the portafilter, and controlling the pressure of the resulting extraction. There are various kinds of group heads each with its own advantages and drawbacks. Some focus on temperature stability, others on pre-infusion capabilities, while others are designed to control the lever. Some have a combination of features, like the E61 one, which is the classic choice among many baristas for its ability to offer multiple perks in one package. As you can see in the photo above the group head comes with many notches in which you can place your portafilter and then twist it by hand to secure it. There is also a gasket made of rubber that resides inside the notches, which helps create the seal when you insert your portafilter into the machine. The notches allow for precise placement of your portafilter. This is essential for an efficient extraction. In addition to allowing you easily connect your portafilter, the group head is responsible for maintaining a consistent temperature. It does this by circulating hot water through the brew pan and around the portafilter to ensure that it's always at the right temperature to extract. This is crucial, since just a few degrees could make the difference between good and great espresso. The Pump In contrast to manual piston machines which rely on a lever to pressurize water, Rotary espresso machines rely on motorized pumps to supply the nine atmospheric bars of pressure that are required 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 they tend to last longer. However, both types of machine can become damaged due to excessive use and poor cleaning. Pumps are also more complex mechanically, which could increase the price of even the simple models. Certain espresso machines remove the pump completely and use steam pressure to brew espresso. This can cause over-extraction because the boiler that makes steam also heats the water to boil. Additionally, these machines frequently have to rebuild their pressure between cups, which requires time and energy. Many espresso machines make use of either a rotary or vibration pump, with a vibrating model that uses a vibrating disc to create pressure and the rotary model pushing hot water through the grounds under high speed. Both models can make a great espresso, but Rotary machines are quieter and more durable than vibration pumps. The Boiler The boiler is what will heat the water to a temperature that is ideal for extraction. The resultant steam then reaches the portafilter which holds the ground espresso coffee and is then funneled down into the cup. The steam causes enough pressure to push the grounds of coffee through. This results in a layer crema on top. This is one of the main characteristics of a great espresso. There are three types of espresso makers, which differ in the type of pump they use and the degree of heat that the brew is. There are different ways to control the amount of brew, as well as the size of cup that can be produced by the machine. The first espresso machines were steam-type. The first espresso machines were steam-type machines. This led to the coffee tasting bitter and burnt. This is the reason Milanese producers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine. The most popular espresso machine is a semiautomatic one with an electric pump. When people think of espresso machines, they envision these machines. If you have a semi-automatic machine you have to grind the beans and tamp them by hand, but the pump regulates the flow of water and pressure. This is an excellent compromise between human touch and the mechanised accuracy. The Filter Typically, espresso machines use filters that separate the grounds of coffee as they move through the hot water. The filter is also a vital part of the machine's temperature control, since it stops overheating. Filters also aid in flavor since it allows for an extended flowering time. This allows the beans to release their flavor and gives an opportunity to improve extraction. However it is crucial to keep in mind that even a great filter can make a terrible cup of coffee as the quality of the beans and extraction is crucial. It's in this area that the magic takes place. This is what makes espresso taste so delicious. The grouphead, sometimes referred to as the brew head, is the place where the portafilter (the thing you put the coffee ground into) is placed when you're making espresso. In a 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 machines are less expensive and easier for the owner to maintain than pumps-driven models. They are however limited in their ability for creating the ideal conditions for brewing, as they operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars. In recent years, compressed air pump-driven espresso machines have become more popular. They use an air-compressor to push hot water through the ground. They are also more mobile than electric steam-driven espresso machines.