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How Does Machine Espresso Work? Machine espresso utilizes precise pressure and mind-blowing filter technology to create the delicious coffee we 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 that of making drip coffee. However it is the pressure that makes the main difference. The Group Head As the name suggests, the group head is where you insert your portafilter when brewing espresso. It disperses the water into the portafilter, and then controls the pressure of the extraction. There are a variety of types of group heads, each with their unique advantages and drawbacks. Some are designed for stability of temperature while others are designed to handle pre-infusion. Others are built to control the lever. There are even some that include a mix of features, such as the E61 that is the standard choice for many baristas due to its ability to offer multiple perks in a single package. As you can see in the above photo The group head features several notches where you place your portafilter and then twist it with your hands to secure it. There is also a gasket made from rubber which is located inside the notches, which helps create an airtight seal when you insert your portafilter into the machine. The notches allow for precise placement of the portafilter. This is crucial to ensure a consistent extraction. In addition to allowing you effortlessly insert your portafilter the group head is responsible for maintaining a consistent temperature. 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. This is vital, because just a few degrees could make the difference between a excellent and great espresso. The Pump The motorized pumps that are used in rotary espresso machines supply the nine atmospheric bar pressure that is required to extract espresso. This is different from manually operated piston machines that employ levers. The pressure is created by pumping water through a heat exchanger and then through the ground coffee. Pumps tend to be less expensive and last longer than piston-driven machines. However, both kinds of machines can deteriorate due to overuse and poor cleaning. They also add mechanical complexity, which can result in the cost of even the simplest models. Some espresso machines employ steam pressure instead of a pump to brew espresso. This can lead to over-extraction as the boiler that produces steam also heats the water to boil. In addition, these machines frequently have to restore their pressure between cups, which requires time and energy. Many espresso machines make use of a rotary or vibration pump. A vibration model uses an oscillating disk to create pressure, whereas a Rotary model pushes hot coffee through the ground at a rapid speed. Both types of machines can make 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 the ideal temperature to extract. The steam that is produced reaches the portafilter that contains the ground espresso coffee and is then pumped into the cup. During this process, steam creates pressure that pushes through the coffee grounds. This results in a layer crema on top. This is a sign of a great espresso. There are three different types of espresso machines, each with distinct pumps and the temperature of the brew. There are various ways in which the brew could be controlled, as well as the size of the cup the machine can produce. The first espresso machines were steam-type. They employed one boiler to make both brew and steam, however, the pressure they could produce was not very high – two bars of atmospheric pressure at the most. The coffee tasted bitter and burned. This is the reason Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine. The most common espresso machine is a semiautomatic model with an electric pump. When people think of espresso machines, they picture these machines. Semi-automatic machines require you to grind and tamp the beans on your own while the pump controls the flow of water and pressure. This is a great compromise between the human touch and mechanized quality. The Filter Espresso machines typically have a filter that separates the grounds of the coffee from the hot water. The filter is also an important part of the temperature control system, as it keeps the machine from overheating. It also enhances flavor, as a filter lets you enjoy a longer bloom phase. This allows the beans to release their nuances, and allows for a better extraction. However it is crucial to remember that even a good filter can make a terrible cup of coffee as the quality of the beans and extraction is essential. This is where the magic happens. It's what makes espresso taste good. The grouphead, often referred to as the brew head, is where the portafilter (the container you place the ground coffee in) is located when you're making espresso. In an espresso machine that is driven by steam, hot water is heated in an airtight tank to create steam, which is then pushed through the grounds at high pressure. These types of machines are generally cheaper and easier to maintain than pump-driven models. However, they are not as efficient in their ability to create the ideal conditions for brewing since they are only operating at 1-1.5 bars of pressure. While the perfect shot requires 9-10 bars. In recent years, compressed air-driven espresso machines have become more popular. Highly recommended Web-site use an air compressor to push hot water through the ground and are more mobile than electric steam-driven espresso machines.