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How Does Machine Espresso Work? The machine espresso makes use of precision pressure, and filtering system that is awe-inspiring to make the coffee you enjoy. What exactly is it? To make 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 name implies, the group head is where you place your portafilter while brewing espresso. It is responsible for dispersing the water into the portafilter and then controlling the pressure of the extraction. There are several different types of group heads, each with their unique advantages and drawbacks. Some are focused on temperature stability, some on pre-infusion options, and others are designed to control the lever. Some have a combination, like the E61. This is a popular choice among baristas as it provides a variety of advantages in one package. As mini espresso maker can see from the above photo the head of the group is fitted with a variety of notches. You can place your portafilter into these notches and twist the head to secure it. There is also a gasket made of rubber in the notches and helps create an airtight seal after inserting your portafilter into the machine. The notches allow for an exact placement of the portafilter. This is crucial for an accurate extraction. In addition to allowing you easily connect your portafilter, the group head is responsible for maintaining an even temperature. It does this by cycling hot water through the brew basket and around the portafilter, making sure that it is always at the right temperature for extraction. It is important to remember that even a tiny difference can make the difference between a great and a 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 provide the nine atmospheric bars of pressure needed for espresso extraction. The pressure is created by removing tap water from a reservoir, and pumping it through a heat exchanger before it is shot through the ground coffee in the group head. Pumps are typically less expensive and last longer than piston-driven machines. However, both kinds of machines may degrade due to excessive use and inadequate cleaning. They also create mechanical complexity, which can result in a high price tag on even the most basic models. Some espresso machines make use of steam pressure instead of a pump for brewing 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 the machines often have to restore their pressure between cups, which requires time and energy. Many espresso machines employ either a rotary or vibration pump, which is a vibration model using a vibrating disc to create pressure, and an rotary model that pushes hot water through the grounds at high speed. Both types of machine are capable of producing excellent espresso, however rotary machines are quieter and more durable than vibration pumps. The Boiler The boiler is the component that heats water to the optimal temperature for extraction. The steam that is produced reaches the portafilter, which holds the espresso grounds. It is then funneled into the cup. The steam creates enough pressure to push the coffee grounds through. This results in a crema on top of the espresso. This is the hallmark of a good espresso. There are three kinds of espresso makers. They differ in the type of pump they employ and the degree of heat that the coffee is. There are different ways that the brew may be controlled as well as the dimensions of the cup the maker can create. The first espresso machines were steam types. The earliest espresso machines were steam-type machines. The coffee tasted bitter and burnt. This is why Milanese makers Luigi Bezzerra and Desiderio Pavoni created the modern espresso machine. The most commonly used espresso maker is a semi-automatic machine with an electric pump. This is what people envision when they imagine an espresso machine. With a semi-automatic machine you have to grind the beans and tamp them by hand. However, the pump is able to regulate the flow of water and pressure. This is a great solution that combines human control with mechanised consistency. The Filter Espresso machines typically have a filter that separates the grounds of the coffee from hot water. The filter is also an essential part of the machine's temperature control, since it stops overheating. A filter also helps with flavor because it allows for a longer flowering period. This allows the beans to let their nuances out, and allows for better extraction. However it is crucial to remember that even a good filter can make a terrible cup of coffee, since the quality of the beans and extraction are vital. This is where the magic happens, and it's what makes espresso taste good. The grouphead, also called the brew head, is where the portafilter (the thingy you put the coffee grounds into) is located when you're making espresso. In a steam-driven espresso machine hot water is heated in an airtight tank to create steam, which is then pushed through the grounds with high pressure. These types of machines are generally less expensive and simpler to maintain than pumps-driven models. They are however limited for creating the ideal conditions for brewing as they only operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars. In recent years, espresso machines driven by a compressed air pump have become increasingly popular. They utilize an air compressor to force hot water through the grounds, and are far more portable than electric steam-driven machines.