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How Does Machine Espresso Work? The machine espresso uses precision pressure, and filtering technology that is amazing to make the coffee you love. How does it work exactly? To make an espresso hot water is pushed under pressure through finely ground coffee. The process is similar to making drip coffee. However, the pressure is the primary difference. The Group Head The name implies the group head is where you place your portafilter when brewing espresso. It disperses water in the portafilter, and then regulates the pressure of extraction. There are a variety of group heads each with its own advantages and drawbacks. Some focus on temperature stability, some on pre-infusion capabilities, while others are designed to control the lever. Some have a combination, such as the E61. This is a popular choice among baristas since it provides multiple benefits in a single package. As you can see in the above image, the group head has many notches in which you can place your portafilter before twisting it with your hands to secure it. A gasket made of rubber is placed inside the notches to help create a seal as you insert your portafilter. The notches allow for an exact placement of the portafilter. This is vital for an efficient extraction. The group head not only allows you to insert your portafilter easily however it also keeps the temperature at a constant level. This is achieved by cycling hot water around the portafilter, and through the brew-basket to ensure the temperature is always right to extract the coffee. This is crucial, since even a small difference in temperature can make the difference between good and excellent espresso. The Pump In contrast to manual piston machines which rely on a lever to pressurize water, the rotary espresso machines use motorized pumps to supply the nine atmospheric bars of pressure that are required for espresso extraction. The pressure builds by removing tap water from a reservoir, and pumping it through a heat exchanger before being pushed through the ground coffee inside the group head. Pumps tend to be more affordable and last longer than piston-driven machines. However, both types of machines are susceptible to degrading due to excessive use and poor cleaning. They also add mechanical complexity which can result in a high price tag on even the most basic models. Some espresso machines eliminate the pump completely and instead 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 typically have to restore their pressure between cups, which requires time and energy. Many espresso machines make use of the rotary or vibration pump, which has a vibration model that uses a vibrating disc to create the pressure, and an rotary model that pushes hot water through the grounds under high speed. Both types of machine can make excellent espresso, however the rotary models are quieter and more durable than vibration pumps. The Boiler The boiler will heat the water to the perfect temperature to extract. The resultant steam then reaches the portafilter, which contains ground espresso beans and is then funneled down into the cup. During this process, the steam creates pressure that pushes through the grounds of the coffee. This creates a layer crema that is then poured over. This is a hallmark of a good espresso. There are three kinds of espresso makers, which differ in the kind of pump they use and how hot the brew is. There are different ways in which the brew can be controlled and 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 resulted in the coffee tasting burnt and bitter. The modern espresso machine was developed by the Milanese producers Luigi Bezzerra & Desiderio Pavoni. The most popular espresso maker is a semi-automatic machine with an electric pump. These are what people imagine when they imagine an espresso machine. With a semi-automatic espresso machine, you must grind the beans and then tamp them by hand, but the pump is able to regulate the flow of water and pressure. This is a great solution that combines human control with mechanized consistency. The Filter Espresso machines typically have filters that separate the grounds of coffee from hot water. The filter is also an important part of the temperature control system, as it prevents the machine from overheating. A filter also improves flavor since it allows for a longer flowering phase. This lets the beans release their flavor and improves extraction. However, it is important to remember that even a top filter can make a terrible cup of coffee, since the quality of the beans and extraction is vital. This is where the magic happens. retro espresso maker what makes espresso taste good. The grouphead, often called the brew head, is where the portafilter (the thing you put the coffee ground into) sits when you're making espresso. Steam-driven espresso machines make use of hot water that is heated inside an airtight container to produce steam. The steam then pushes hot water through grounds of coffee under high pressure. These machines are less expensive and are easier for the user to maintain than pumps-driven models. However, they are not as efficient in their capacity to create the perfect brewing conditions 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 use an air-compressor to force hot water into the ground and are more mobile than steam-driven electric espresso machines.