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How Does Machine Espresso Work? The machine espresso utilizes precision pressure, and filtering system that is awe-inspiring to make the coffee you enjoy. But how exactly does it work? To make espresso hot water is pushed under pressure through finely ground coffee. The process is similar to making drip coffee, however the main difference lies in the pressure. The Group Head The group head is the portafilter you place in the espresso maker when making it. It disperses the water into the portafilter, and regulates the pressure of the extraction. There are a variety of group heads each with their own advantages and disadvantages. Some are designed to provide stability of temperature while others are specifically designed to handle pre-infusion. Others are built to control the lever. Some come with a range of features, such as the E61, which is to be the most popular among baristas because of its ability to provide multiple benefits in one package. As you can see in the image above the group head is fitted with a variety of notches. It is possible to place your portafilter inside these notches, and then turn the head around to secure it. There is also a rubber gasket in the notches, which helps create an airtight seal after inserting your portafilter into the machine. The notches on the head allow for a precise positioning of the portafilter which is crucial to ensure a consistent extraction. In addition to allowing you easily insert your portafilter, the group head is responsible to ensure that the temperature remains even. This is done by cycling hot water around the portafilter, and through the brew-basket, ensuring that the temperature is constant for extraction. This is crucial, since even a few degrees can be the difference between a good and excellent espresso. The Pump Unlike manual piston machines, which rely on a lever that pressurize water, Rotary espresso machines rely on motorized pumps that provide the nine atmospheric bars of pressure needed to extract espresso. This pressure is built up by pumping water through a heat exchanger and then through the ground coffee. Pumps are typically less expensive and last longer than piston-driven machines. However, both kinds of machines may degrade because of frequent use and insufficient cleaning. They also create mechanical complexity and can lead to an expensive price for even the simplest models. Some espresso machines remove the pump entirely and utilize steam pressure to make espresso. The downside is that the same boiler that produces steam also raises the temperature of water to the point of boiling, which can lead to excessive extraction. In addition, these machines frequently have to rebuild their pressure between cups, which requires time and energy. Many espresso machines use the rotary or vibration pump. A vibration model utilizes the vibrating disk to create pressure, while the circular model pushes hot liquid through the ground at a fast speed. espresso coffee machines uk can make excellent espresso, but the rotary pumps are quieter, and more durable than vibration pumps. The Boiler The boiler will heat the water to the ideal temperature to extract. The steam created gets to the portafilter which holds the espresso grounds. It is then pumped into the cup. The steam causes enough pressure to push the grounds of coffee through. This results in a crema on top of the espresso. This is one of the hallmarks of a great espresso. There are three types of espresso machines, each with different pumps and brew temperature. There are also different ways in which the brew can be controlled and the dimensions of the cup the machine can produce. The first espresso machines were steam-type. The earliest espresso machines were steam types. The coffee tasted bitter and burnt. The modern espresso machine was developed by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni. The most popular espresso machine is a semiautomatic that has an electric pump. When people think of espresso machines, they think of these machines. With a semi-automatic espresso machine, you need to grind the beans and tamp them by hand. The pump regulates the flow of water and pressure. This is a perfect compromise between human control and mechanised accuracy. The Filter Espresso machines usually use filters that separate the coffee grounds from the hot water. The filter is also an essential component of the temperature control system, as it prevents the machine from overheating. A filter can also help with flavor as it allows for the beans to flower for a longer period of time. This allows the beans to let their nuances out and provides an opportunity to improve extraction. However it is crucial to keep in mind that even a great filter can make a terrible cup of coffee, since the quality of the beans and extraction is still vital. This is where the magic happens, it's the thing that makes an espresso really taste great. The grouphead (also known as the brewhead) is where you put the portafilter, the device that you use to put the grounds of coffee into when making espresso. Steam-driven espresso machines make use of hot water heated in an airtight container to produce steam. The steam then pushes hot water through the grounds of coffee under high pressure. These machines are cheaper and are easier for the user to maintain than pumps-driven models. However, they are not as efficient in their ability to produce the ideal conditions for brewing since they 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 become more popular. They make use of an air compressor to force hot water into the ground and are much more mobile than steam-driven electric espresso machines.