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How Does Machine Espresso Work? Machine espresso uses precision pressure and mind-blowing filter technology to create the delicious coffee we enjoy. How 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, it is the pressure that makes the main difference. The Group Head As the name suggests, the group head is where you insert your portafilter when brewing espresso. It is responsible for dispersing water into the portafilter before controlling the pressure of the extraction. There are numerous kinds of group heads each with its own advantages and disadvantages. Some are designed for the stability of temperature while some are specifically designed to handle pre-infusion. Others are made to control the lever. Some include a combination such as the E61. This is a favorite among baristas as it provides a variety of advantages in one package. As you can see in the photo above the head of the group is fitted with a variety of notches. The portafilter is placed in these notches, then twist the head to lock it. There is also a rubber gasket that resides inside the notches, which helps create an airtight seal when you insert your portafilter into the machine. The notches allow for the precise placement of the portafilter. This is crucial for an efficient extraction. The group head not only lets the portafilter to be inserted easily but also maintains the same temperature. This is done by cycling hot water around the portafilter, and through the brew-basket to ensure that the temperature is constant for extraction. This is crucial, since even a few degrees can make the difference between a excellent and great espresso. The Pump In contrast to manual piston machines which rely on a lever to pressurize water, Rotary espresso machines rely on motorized pumps that provide the nine atmospheric bars of pressure needed for espresso extraction. The pressure is created by removing tap water from a reservoir and pumping it through a heat exchanger prior to it is shot through the ground coffee inside the group head. espresso machines uk are generally less expensive and last for longer than piston-driven machines. However, both types of machines may degrade because of frequent use and inadequate cleaning. They also create mechanical complexity and can lead to a high price tag on even the simplest models. Certain espresso machines eliminate the pump entirely and use steam pressure to brew espresso. The disadvantage of this is that the boiler that produces steam also increases the temperature of the water to boiling which could lead to over-extraction. In addition the machines often have to restore their pressure between cups, which takes time and energy. A majority of espresso machines utilize an rotary or a vibration pump. A vibration model utilizes an oscillating disk to create pressure, whereas a rotary model pushes hot water through the ground at high speed. Both models can produce an excellent espresso, however Rotary machines are quieter and more durable than vibration pumps. The Boiler The boiler heats the water to the perfect temperature to extract. The steam that is produced reaches the portafilter containing the ground espresso and is then funneled down into the cup. During this process, steam causes pressure to push through the coffee grounds. This creates a crema on top of the espresso. This is the hallmark of a good espresso. There are three kinds of espresso makers. They differ in the type of pump they use and the degree of heat that the coffee is. There are a variety of ways to control the amount of brew, as well as the size of the cup that can be made by the machine. The first espresso machines were steam-types. The first espresso machines were steam-type machines. The coffee tasted bitter and burnt. The modern espresso machine was invented by the Milanese producers Luigi Bezzerra & Desiderio Pavoni. The most common espresso maker is a semi-automatic one that has an electric pump. When people think of espresso machines, they imagine these machines. With a semi-automatic espresso machine, you need to grind the beans and then tamp them yourself but the pump regulates the flow of water and pressure. This is a great compromise between the human touch and mechanized quality. The Filter Espresso machines typically have a filter that separates the grounds of coffee from hot water. The filter is also an essential part of the temperature control system because it stops the machine from overheating. It also enhances flavor, since a filter allows for a longer bloom phase. This helps the beans to release their nuances and gives an opportunity for better extraction. However it is crucial to remember that even a top filter can make a terrible cup of coffee, since the quality of the beans and extraction is still essential. This is where the magic happens, and it's what makes an espresso really taste good. The grouphead, often referred to as the brewhead, is where the portafilter (the thingy you put the ground coffee into) is located when you're making espresso. Steam-driven espresso machines make use of hot water heated in an airtight vessel to create steam. The steam then moves hot water through the grounds of the coffee under 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 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 years, compressed air-driven espresso machines have been gaining popularity. They utilize an air compressor to force hot water through the grounds, and are far more portable than electric steam-driven machines.