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How Does Machine Espresso Work? The machine espresso is made using precise pressure, as well as a filter technology that is mind-blowing to make the coffee you love. How exactly does it work? In order to make espresso, hot water is forced under high pressure through finely ground coffee. The process is similar to making drip coffee. However, the pressure is the major difference. The Group Head The group head is the portafilter you place in the espresso maker when making it. It is responsible for dispersing the water into the portafilter before controlling the pressure that results from the extraction. There are many different types of group heads each with its own advantages and disadvantages. Some are specifically designed for temperature stability while others are designed to handle pre-infusion. Some are designed to control the lever. Some come with a combination of both, such as the E61. This is a favorite among baristas since it provides multiple advantages in a single package. As you can see in the above photo the group head is made up of numerous notches that you can place your portafilter before twisting it with your hands to lock it in. There is also a rubber gasket that is a part of the notches to help create an airtight seal when you insert your portafilter into the machine. The notches on the head allow for a precise positioning of the portafilter which is essential for an even extraction. In addition to allowing you effortlessly insert your portafilter the group head is responsible to maintain an even temperature. It does this by circulating hot water through the brew pan and around the portafilter, ensuring that it's always at the correct temperature to extract. coffeee.uk is important because even a few degrees can be the difference between a good and excellent espresso. The Pump In contrast to manual piston machines that use a lever to pressurize water, rotating espresso machines rely upon motorized pumps to supply the nine atmospheric bars of pressure necessary for espresso extraction. This pressure is built up by pumping water through a heat-exchanger and then through the ground coffee. Pumps tend to be cheaper than piston-driven models, and they tend to last longer. However, both types of machines may degrade with overuse and insufficient cleaning. Pumps are also more complicated mechanically, which can raise prices of even simple models. Some espresso machines remove the pump entirely and utilize steam pressure to make espresso. This can lead to over-extraction as the boiler that produces steam also heats the water to boil. They also have to continually rebuild their pressure between cups. This takes energy and time. A majority of espresso machines use the rotary or vibration pump, which is a vibration model using a rotating disc to create pressure and an rotary model that pushes hot water through the grounds at high speed. Both machines can make excellent espresso however rotary machines tend to be more quiet, durable and less likely to break down. The Boiler The boiler is the one that will heat the water to the right temperature to extract. The steam that is created will eventually reach the portafilter, which holds the espresso grounds. It is then pumped into the cup. In this process, the steam causes pressure to push through the coffee grounds. This creates a foam on top of the espresso. This is one of the hallmarks of a good espresso. There are three types of espresso makers, and they differ in the kind of pump they use and the degree of heat that the espresso is. There are also different ways that the brew may be controlled as well as the size of the cup the machine can produce. The earliest espresso machines were steam-based. They had one boiler to create both steam and brew however, the pressure they could produce was not very high – two bars of atmospheric pressure maximum. This resulted in the coffee tasting burnt and bitter. The modern espresso machine was created by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni. The most well-known espresso maker is a semi-automatic machine 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 your beans yourself The pump, however, regulates the flow of water and pressure. This is a fantastic compromise between human control and mechanized consistency. The Filter Espresso machines usually have filters that separate the grounds of the coffee from hot water. The filter is also a crucial part of the temperature control system, because it stops the machine from overheating. A filter can also help with flavor since it allows for a longer flowering period. This allows the beans to let their nuances out and provides the chance for better extraction. However, it is important to remember that even a good filter could result in a bad cup of coffee, because the quality of the beans and extraction are crucial. It's in this area that the magic happens. This is the reason why espresso tastes so good. The grouphead (also known as the brewhead) is where you put the portafilter, the device which you put the coffee grounds in, when making espresso. Steam-driven espresso machines make use of hot water that is heated inside an airtight vessel to create steam. The steam then moves hot water through the coffee grounds under high pressure. They are less expensive and easier for the owner to maintain than pumps-driven models. However, they are not as efficient in their capacity to create the ideal conditions for brewing as they only operate at 1-1.5 bars of pressure, while the perfect shot requires 9-10 bar. In recent years, espresso machines powered by a compressed air compressor have become increasingly popular. They use an air compressor to push the hot water through the grounds and are significantly more portable than steam-driven electric machines.