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How Does Machine Espresso Work? The machine espresso makes use of precise pressure and filtering technology that is amazing to make the coffee you love. What exactly is it that makes it work? Espresso is made by forcing hot water at high pressure through finely ground coffee. The process is similar to making drip coffee. However the pressure is the primary difference. The Group Head The group head is the portafilter that is inserted when you are making espresso. It disperses the water into the portafilter and regulates the pressure of the extraction. There are many different types of group heads each with their own advantages and drawbacks. Some are designed for temperature stability while others are built to handle pre-infusion. Others are made to control the lever. Some include a mix of features, such as the E61 one, which is the classic choice among many baristas for its ability to provide multiple benefits in a single package. As you can see in the image above, the group head has several notches to place your portafilter and then twist it with your hands to lock it in. A gasket made of rubber is positioned inside the notches to help make a seal when you insert your portafilter. The notches allow for precise placement of your portafilter. This is vital for an efficient extraction. Apart from allowing you easily insert your portafilter, the group head is also responsible to maintain an even temperature. It does this by cycling hot water through the brew pan and around the portafilter to ensure that it is always at the correct temperature for extraction. This is crucial, since just a few degrees could be the difference between a good and excellent espresso. The Pump The motorized pumps in espresso machines rotary provide nine atmospheric bar pressure that is required for espresso extraction. This differs from manual piston machines that rely on a lever. This pressure builds up by drawing tap water from a reservoir and pumping it through a heat exchanger prior being pushed through the ground coffee in the group head. Pumps tend to be cheaper than piston-driven machines, and they tend to last longer, although both types of machines can be damaged by excessive use and inadequate cleaning. They also create mechanical complexity and can lead to a high price tag on even the most basic models. Some espresso machines do away with the pump completely and instead utilize steam pressure to make espresso. This can result in over-extraction because the boiler that produces steam also warms the water to boil. Additionally the machines often have to rebuild their pressure between cups, which takes time and energy. Many espresso machines employ an rotary or vibrating pump, which has a vibration model that uses a vibrating disc to generate the pressure, and rotating models that push hot water through the grounds under high speed. Both machines can produce excellent espresso, but rotary machines are more stable, quieter and less likely to break. The Boiler The boiler is what will heat the water to the right temperature for extraction. espresso coffee machines created will eventually reach the portafilter, which is the container that holds the espresso coffee grounds. It is then pumped into the cup. During this process the steam is able to create enough pressure to push the grounds of the coffee through. This creates a foam on top of the espresso. This is a sign of a great espresso. There are three types of espresso makers, which differ in the kind of pump they use and the degree of heat that the brew is. There are different ways to control the strength of the brew and the size of the cup that can be produced by the machine. The first espresso machines were steam-type. They had a single boiler to make both brew and steam, however the pressure they were able to produce was very low – just two bars of atmospheric pressure at the most. The coffee tasted bitter and burnt. The modern espresso machine was invented by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni. The most commonly used espresso maker is a semiautomatic machine that has 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 on your own, but the pump regulates the water flow and pressure. This is a great combination of human control and mechanised reliability. The Filter Espresso machines usually have filters that separate the grounds of the coffee from the hot water. The filter is also an essential component of the machine's temp control, as it helps prevent overheating. Filters also aid in flavor because it allows for a longer flowering period. This helps the beans let their nuances out and provides an opportunity for better extraction. It is important to keep in mind that even the finest filter can result in a bad cup of coffee. The quality of the beans, and the extraction process are still crucial. This is where the magic happens, and it's what makes espresso taste good. The grouphead, sometimes referred to as the brew head, is where the portafilter (the device you put the ground coffee into) is placed when you're making espresso. In a steam-driven espresso machine hot water is heated in an airtight container to create steam. This then pushes the hot water through the grounds with high pressure. These machines are less expensive and easier for the owner to maintain than pumps-driven models. However, they are limited in their ability to create the perfect brewing conditions since they are only operating at 1-1.5 bars of pressure. However, the perfect shot requires 9-10 bar. In recent years, compressed air-pump-driven espresso machines have been gaining popularity. They use an air compressor to force hot water through the ground. They are also more mobile than steam-driven electric espresso machines.