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How Does Machine Espresso Work? The machine espresso makes use of precise pressure and filter technology that is mind-blowing to create the coffee you enjoy. How exactly does it work? Espresso is produced by pushing hot water under pressure through finely ground coffee. The process is similar to that of making drip coffee. However, it is the pressure that makes the main difference. The Group Head The group head is the portafilter you insert when brewing espresso. portable espresso maker is responsible for dispersing the water into the portafilter and then controlling the pressure of the resulting extraction. There are various kinds of group head, each with their particular advantages and drawbacks. Some are specifically designed for temperature stability while others are specifically designed to handle pre-infusion. Some are designed to control the lever. Some come with a combination of both, like the E61. This is a favorite among baristas due to the fact that it has multiple benefits in one package. As you can see in the photo above The group head features several notches where you place your portafilter before twisting it by hand to lock it in. There is also a gasket made of rubber in the notches to help create an airtight seal when you insert your portafilter into the machine. The notches allow for precise placement of your portafilter. This is crucial to ensure an even extraction. Apart from allowing you easily insert your portafilter, the group head is also responsible to ensure that the temperature remains even. This is accomplished by cycling hot water around the portafilter and through the brew-basket to ensure that the temperature is at the right level for extraction. It is important to remember that even a slight deviation can make the difference between a great and a great espresso. The Pump The motorized pumps that are used in espresso machines that rotate provide the nine atmospheric bar pressure required to extract espresso. This is different from manual piston machines that rely on levers. 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, but both types of machines may get damaged through overuse and lack of cleaning. Pumps are also more complex mechanically, which can raise prices of even most basic models. Certain espresso machines remove the pump completely and use steam pressure to brew espresso. This can result in over-extraction because the boiler that produces steam also heats the water until it comes to a boil. In addition, these machines frequently have to rebuild their pressure between cups, which requires time and energy. Many espresso machines employ an rotary or vibrating pump, with a vibrating model using a rotating disc that generates the pressure and a rotary model pushing hot water through the grounds under high speed. Both machines can produce excellent espresso but rotary machines are quieter, more durable and less likely to fail. The Boiler The boiler makes the water warm to a temperature that is ideal to extract. The resulting steam reaches the portafilter which holds ground espresso beans and is then funneled down into the cup. The steam causes enough pressure to push the grounds of coffee through. This produces a layer of crema that is then poured over. This is one of the main characteristics of a great espresso. There are three types of espresso makers, which differ in the kind of pump they use and how hot the coffee is. There are a variety of ways to control the amount of brew, as well as the size of cup that can be made by the machine. The earliest espresso machines were steam-based. They employed one boiler to make both steam and brew however, the pressure they could create was minimal – two bars of atmospheric pressure, at most. The coffee tasted bitter and burnt. This is the reason why Milanese makers Luigi Bezzerra and Desiderio Pavoni developed the modern espresso machine. The most popular espresso maker is a semi-automatic machine with an electric pump. These are what people imagine when they imagine an espresso machine. With a semi-automatic espresso machine, you need to grind the beans and then tamp them by hand. However, the pump controls the flow of water and pressure. This is a great compromise between human control and mechanised consistency. The Filter Espresso machines usually have filters that separate the grounds of the coffee from hot water. The filter is also a vital component of the machine's temp control, as it helps prevent overheating. Filters also aid in flavor since it allows for a longer flowering phase. This helps the beans release their nuances and gives the chance for better extraction. However it is crucial to keep in mind that even a good filter could result in a bad cup of coffee, as the quality of the beans and extraction is essential. 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 used to place the coffee grounds in, while making espresso. Steam-driven espresso machines use hot water that is heated inside an airtight vessel to create steam. The steam then pushes hot water through the coffee grounds under high pressure. These kinds of machines are generally less expensive and easier to maintain than pumps-driven models. However, they are not as efficient in their ability to create the ideal brewing conditions, since they are only operating at 1-1.5 bars of pressure. While the perfect shot requires 9-10 bars. In recent years, espresso machines driven by a compressed air compressor have become increasingly popular. They use an air-compressor to push hot water through the ground, and are more mobile than electric steam-driven espresso machines.