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How Does Machine Espresso Work? The machine espresso is made using precise pressure, as well as a filter technology that is awe-inspiring 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 making drip coffee. However, the pressure is the major difference. The Head of the Group The name implies the group head is where you place your portafilter when making espresso. It disperses the water into the portafilter and controls the pressure of the extraction. There are many different kinds of group heads, each with their unique advantages and disadvantages. Some focus on temperature stability, others on pre-infusion options, and others are designed to control the lever. Some come with a range of features, such as the E61, which is to be the most popular among baristas for its ability to provide multiple benefits in one package. As you can see in the image above the group head comes with numerous notches that you can place your portafilter and then twist it with your hands to lock it in. There is also a gasket of rubber that resides inside the notches and helps to create an airtight seal after inserting your portafilter into the machine. The notches permit the precise placement of the portafilter. This is crucial for an even extraction. Aside from allowing you to easily place your portafilter in, the group head is also responsible for maintaining a consistent temperature. This is done by cycling hot water around the portafilter, and through the brew basin, ensuring that the temperature is at the right level to extract the coffee. This is vital, because even a few degrees can make the difference between a good and great espresso. The Pump Unlike manual piston machines, which rely on a lever to pressurize water, the rotary espresso machines use motorized pumps that provide the nine atmospheric bars of pressure necessary for espresso extraction. This pressure builds up by removing tap water from a reservoir, and pumping it through a heat exchanger prior being pushed through the ground coffee inside the group head. Pumps are typically less expensive and last for longer than piston-driven machines. However, both kinds of machines can degrade because of excessive use and inadequate cleaning. They also increase the complexity of mechanical systems, which can result in costly prices for even the simplest models. Some espresso machines remove the pump completely and instead utilize steam pressure to make espresso. The drawback is that the same boiler that produces steam also raises the temperature of water to boiling which can cause over-extraction. Additionally these machines typically have to restore their pressure between cups, which requires time and energy. Many espresso machines use either a vibration or rotary pump. A vibration model utilizes a rotating disk to generate pressure, whereas a rotary model pushes hot water through the ground at a high speed. Both types of machine can make excellent espresso, but the rotary models are quieter and more durable than vibration pumps. The Boiler The boiler is the element that heats water to an ideal temperature to extract. The steam created reaches the portafilter, which holds the espresso grounds. The steam is then channeled into the cup. During this process, steam causes pressure to push through the coffee grounds. This results in a crema on the top of the espresso. This is the hallmark of a good espresso. There are three types of espresso makers, and they differ in the type of pump they employ and the degree of heat that the coffee is. There are a variety of ways that the brew may be controlled as well as the size of the cup that the machine can make. The first espresso machines were steam-type. The first espresso machines were steam types. The coffee tasted bitter and burned. The modern espresso machine was invented by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni. The most commonly used espresso maker is a semi-automatic one with an electric pump. When people think of espresso machines, they think of these machines. Semi-automatic machines require you to grind and tamp the beans yourself however the pump controls the water flow and pressure. This is a fantastic combination of human control and mechanised reliability. The Filter Typically, espresso machines have a filter to separate out the grounds of coffee when they pass through the hot water. The filter is also an important element of the temperature control system, as it prevents the machine from overheating. A filter also improves flavor since it allows for an extended flowering time. This allows the beans to let their nuances out, and allows for a better extraction. espresso machine uk 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 process remain vital. It's here that the magic takes place. This is the reason why espresso tastes so delicious. The grouphead, often referred to as the brewhead, is where the portafilter (the container you place the ground coffee in) is placed when making espresso. Steam-driven espresso machines make use of hot water heated in an airtight container to make steam. The steam then pushes hot water through grounds of the coffee under pressure. They are less expensive and are easier for the user to maintain than pumps-driven models. They are however limited to create the perfect conditions for brewing, as they operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars. In recent years, compressed air pump-driven espresso machines have become more popular. They use an air compressor to push hot water into the grounds and are significantly more portable than steam-driven electric machines.