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How Does Machine Espresso Work? The machine espresso utilizes precision pressure, and filter technology that is mind-blowing to make the coffee you enjoy. What exactly is it that makes 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 the pressure is the main difference. The Group Head The group head is the portafilter you put in when making espresso. It is responsible for dispersing water into the portafilter, and controlling the pressure of the extraction. There are numerous kinds of group heads each with their own advantages and disadvantages. Some are focused on temperature stability, others on pre-infusion capabilities, and still others are designed to control the lever. There are even some that have a combination of features, such as the E61, which is considered the most popular choice among baristas due to its capacity to offer multiple perks in a single package. As you can see in the photo above the group head is made up of several notches where you place your portafilter before twisting it manually to lock it in. There is also a gasket made from rubber which is located inside the notches and helps create a seal when you insert your portafilter into the machine. The notches allow for an exact placement of the portafilter. This is crucial to ensure a consistent extraction. In addition to allowing you to easily connect your portafilter, the group head is also responsible for maintaining a consistent temperature. It does this by cycling hot water through the brew basket, and around the portafilter to ensure that it's always at the correct temperature to extract. It is important to remember that even a few degree deviation can make the difference between a good and a great espresso. The Pump The motorized pumps that are used in espresso machines that rotate provide the nine atmospheric bar pressure required for espresso extraction. This differs from manual piston machines that use a lever. The pressure builds up by removing tap water from a reservoir and pumping it through a heat exchanger prior it is shot through the ground coffee in the group head. Pumps tend to be cheaper than piston-driven models, and they tend to last longer, but both types of machines can become damaged due to excessive use and poor cleaning. Pumps are also more complicated mechanically, which can raise the cost of even the simpler models. Some espresso machines eliminate the pump completely and utilize steam pressure to make espresso. This can lead to over-extraction as the boiler that makes steam also warms the water to boil. These machines also have to constantly rebuild their pressure in between cups. This takes energy and time. espresso coffee machines of espresso machines utilize an rotary or a vibration pump. A vibration model uses the vibrating disk to create pressure, while a rotary model pushes hot water through the ground at high speed. Both types of machine are capable of producing excellent espresso, but the rotary models are quieter and more durable than vibration pumps. The Boiler The boiler is the part that heats water to the ideal temperature for extraction. The steam created is then directed to the portafilter, which contains the espresso coffee grounds. The steam is then channeled into the cup. During this process, steam creates pressure and pushes through the coffee grounds. This results in a whipped-up top of the espresso. This is a hallmark of a great espresso. There are three distinct types of espresso machines, each having distinct pumps and brew temperature. There are various ways that the brew can be controlled, as well as the size of the cup that the machine can make. The first espresso machines were steam types. The first espresso machines were steam types. This led to the coffee tasting burnt and bitter. This is the reason why Milanese producers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine. The most common espresso maker is a semi-automatic machine with an electric pump. These are the images people have when they imagine an espresso machine. Semi-automatic machines require you to grind and tamp the beans by yourself The pump, however, regulates the flow of water and pressure. This is a fantastic compromise between human control and mechanized reliability. The Filter Typically, espresso machines use filters that separate the grounds of the coffee as they go through the hot water. The filter is also a vital part of the machine's temperature control, as it helps prevent overheating. It also enhances flavor, as a filter allows for a more prolonged bloom time. This lets the beans release their flavors, and allows for better extraction. However it is crucial to keep in mind that even a high-quality filter can make a terrible cup of coffee, as the quality of the beans and extraction is crucial. This is where the magic happens. It's what makes an espresso really taste good. The grouphead (also called the brewhead) is where you place the portafilter, the thingy which you put the coffee grounds in, when making espresso. In a steam-driven espresso machine, hot water is heated in an airtight tank to create steam. This then pushes the hot water through the grounds under high pressure. These kinds of machines are typically less expensive and simpler to maintain than pump-driven models. However, they are limited in their capacity to create the perfect brewing conditions since they are only operating at 1-1.5 bars of pressure, while the perfect shot requires 9-10 bar. In recent years, compressed air-driven espresso machines have been gaining popularity. They use an air-compressor to push hot water through the ground. They are also more mobile than steam-driven electric espresso machines.