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How Does Machine Espresso Work? The machine espresso utilizes precise pressure and filter technology that is awe-inspiring to create the coffee you enjoy. What exactly does it work? To make an espresso 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 main difference. The Head of the Group As the name suggests, the group head is where you place your portafilter when making espresso. It disperses water in the portafilter, and controls the pressure of the extraction. There are a variety of group heads each with distinct advantages and disadvantages. Some focus on temperature stability, some on pre-infusion capabilities, and still others are designed to control the lever. Some have a combination, like the E61. This is a preferred choice for baristas as it provides a variety of advantages in a single package. As you can see in the photo above, the group head has several notches to put your portafilter, then twist it manually to secure it. There is also a gasket made of rubber that resides inside the notches and helps to create an airtight seal after inserting your portafilter into the machine. The notches permit precise placement of the portafilter. This is essential for a consistent extraction. The group head not only allows the portafilter to be inserted easily but also maintains the same temperature. It does this by circulating hot water through the brew pan and around the portafilter to ensure that it's always at the right temperature to extract. It is crucial to keep in mind that even a few degree variation can mean the difference between a decent and a great espresso. The Pump Contrary to manual piston machines which use a lever to pressurize water, the rotary espresso machines use motorized pumps to deliver the nine atmospheric bars of pressure needed for espresso extraction. The pressure builds by removing tap water from a reservoir and pumping it through a heat exchanger before it is shot through the ground coffee inside the group head. Pumps are generally less expensive and last for longer than piston-driven machines. However, both kinds of machines can degrade because of excessive use and inadequate cleaning. Pumps are also more complex mechanically, which can raise the cost of even the most basic models. Some espresso machines can eliminate the pump entirely and use steam pressure to brew espresso. This can result in over-extraction because the boiler that makes steam also causes the water to boil. In addition these machines are often required to restore their pressure between cups, which takes time and energy. Many espresso machines use the rotary or vibration pump. A vibration model utilizes the vibrating disk to create pressure, while a circular model pushes hot liquid through the ground at a fast speed. Both machines can make great espresso however rotary machines tend to be quieter, more durable and less likely to break down. The Boiler The boiler is the component that heats water to an optimal temperature for extraction. The resultant steam then reaches the portafilter, which contains the ground espresso coffee, and gets funnelled down into the cup. The steam is able to create enough pressure to push the grounds of coffee through. This creates a layer crema on top. This is one of the hallmarks of a great espresso. There are three kinds of espresso machines, each having different types of pumps and the temperature of the brew. There are a variety of ways that the brew can be controlled as well as the dimensions of the cup the machine can make. The first espresso machines were steam types. The earliest espresso machines were steam-type machines. This led to the coffee tasting bitter and burnt. This is the reason why Milanese producers Luigi Bezzerra and Desiderio Pavoni developed the modern espresso machine. The most well-known espresso maker is a semi-automatic machine with an electric pump. When people think of espresso machines, they imagine these machines. With a semi-automatic espresso machine, you have to grind the beans and then tamp them yourself but the pump regulates the flow of water and pressure. read here is a great compromise between the human touch and mechanized consistency. The Filter Espresso machines typically use a filter that separates the coffee grounds from the hot water. The filter is also an essential component of the machine's temperature control, as it helps prevent overheating. It also aids in flavor, as it allows for a more prolonged bloom phase. This lets the beans let their nuances out, and also allows for better extraction. It is important to keep in mind that even the best filter can make a bad cup of coffee. The quality of the beans, and the extraction, remain crucial. This is where the magic happens. It's what makes an espresso really taste great. The grouphead (also known as the brewhead) is where you place the portafilter, the device that you use to put the grounds of coffee into when making espresso. In an espresso machine that is driven by steam, hot water is heated in an airtight tank to create steam. This is then pushed through the grounds with high pressure. These types of machines are typically less expensive and easier to maintain than pump-driven models. However, they are not as efficient in their ability to provide the perfect conditions for brewing, since they are only operating at 1-1.5 bars of pressure. While the perfect shot requires 9-10 bar. In recent times, espresso machines powered by compressed air-pump have become increasingly popular. They use an air compressor to force hot water through the ground and are more mobile than steam-driven electric espresso machines.