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How Does Machine Espresso Work? The machine espresso utilizes precise pressure, as well as a filter technology that is awe-inspiring to create the coffee you love. What exactly is it that makes it work? To make best espresso machine , hot water is forced under high pressure through finely ground coffee. The process is similar to that of making drip coffee. However, the pressure is the primary difference. The Head of the Group The name implies the group head is where you put your portafilter in when making espresso. It is responsible for dispersing the water into the portafilter, and controlling the pressure of the resulting extraction. There are a variety of group heads each with its own advantages and drawbacks. Some are focused on temperature stability, whereas others on pre-infusion options, and others are designed to control the lever. Some are a combination, such as the E61. This is a favorite among baristas because it offers multiple benefits in one package. As you can see in the image above the group head is equipped with several notches. It is possible to place your portafilter inside these notches, and then twist the head to lock it. There is also a gasket made of rubber that resides inside the notches and helps 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 to ensure an efficient extraction. The group head does not just allow the portafilter to be inserted easily but also maintains the temperature at a constant level. This is done by cycling hot water around the portafilter and through the brew basin, ensuring that the temperature is at the right level for extraction. It is crucial to keep in mind that even a tiny variation can mean the difference between a great and a excellent espresso. The Pump The motorized pumps used in espresso machines that rotate provide the nine atmospheric bar pressure that is required to extract espresso. This is different from manual piston machines that use a lever. The pressure is built by pumping water through a heat exchanger and then through the ground coffee. Pumps are generally less expensive than piston-driven machines and tend to last longer, but both types of machine can be damaged by excessive use and inadequate cleaning. They also create mechanical complexity which can result in the cost of even the simplest models. Certain espresso machines utilize steam pressure instead of a pump in order to brew espresso. This can cause over-extraction because the boiler that makes steam also causes the water to boil. The machines must also constantly rebuild their pressure between cups. This takes energy and time. Many espresso machines make use of the rotary or vibration pump. A vibration model makes use of an oscillating disk to create pressure, while a Rotary model pushes hot coffee through the ground at a rapid speed. Both machines produce great espresso, but rotary machines are more quiet, durable and less likely to break. The Boiler The boiler is what makes the water warm to the ideal temperature to extract. The steam that is created is then directed to the portafilter, which is the container that holds the espresso coffee grounds. It is then funneled into the cup. During this process, steam creates pressure that pushes through the coffee grounds. This creates a layer crema on top. This is one of the main characteristics of a good espresso. There are three kinds of espresso machines, each with different pumps and brew temperature. There are different ways that the brew may be controlled as well as the size of the cup that the machine can produce. The first espresso machines were steam-type. The first espresso machines were steam types. This led to the coffee tasting burnt and bitter. This is why the Milanese producers Luigi Bezzerra and Desiderio Pavoni developed the modern espresso machine. The most commonly used espresso maker is a semiautomatic machine that has an electric pump. When people think of espresso machines, they imagine these machines. If you have a semi-automatic machine you have to grind the beans and then tamp them yourself but the pump controls the flow of water and pressure. This is a great compromise between the human touch and the mechanised quality. The Filter Espresso machines typically have filters that separate the coffee grounds from the hot water. The filter is also a crucial part of the temperature control system, as it keeps the machine from overheating. Filters also aid in flavor, as it permits the beans to flower for a longer period of time. This allows the beans to release their flavors, and allows for better extraction. It is important to keep in mind that even the finest filter could result in a poor cup of coffee. The quality of the beans and the extraction process are still crucial. It's here that the magic happens. This is the reason why espresso tastes so delicious. The grouphead, sometimes referred to as the brew head, is 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, which is then pushed through the grounds with high pressure. These kinds of machines are usually less expensive and simpler to maintain than pump-driven models. However, they are limited in their capacity to create the ideal brewing conditions, as they only operate at 1-1.5 bars of pressure, while the perfect shot requires 9-10 bar. In recent years, compressed air pump-driven espresso machines have been gaining popularity. They use an air-compressor to force hot water through the ground, and are more mobile than steam-driven electric espresso machines.