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How Does Machine Espresso Work? The machine espresso utilizes precise pressure, as well as a filter technology that is awe-inspiring to create the coffee you enjoy. How exactly does it work? To make an espresso hot water is pushed under 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 Head of the Group The name implies, the group head is where you place your portafilter while brewing espresso. It is responsible for dispersing water into the portafilter, and controlling the pressure of the extraction. There are numerous kinds of group heads each with its own advantages and disadvantages. Some focus on temperature stability, some on pre-infusion options, and others are designed to control the lever. Some have a combination of features, like the E61, which is considered the most popular choice among baristas due to its capacity to offer multiple perks in one package. As you can see in the image above the head of the group is fitted with a variety of notches. It is possible to place your portafilter in these notches, then twist the head to lock it. A gasket made of rubber is placed inside the notches to help create a seal when you insert your portafilter. The notches on the head permit a precise placement of the portafilter, which is vital for a consistent extraction. The group head is not just able to allow the portafilter to be inserted easily, but it also maintains the temperature at a constant level. It does this by circulating hot water through the brew container and around the portafilter, ensuring that it is always at the correct temperature for extraction. This is vital, because just a few degrees could mean the difference between excellent and great espresso. The Pump The motorized pumps in espresso machines that rotate provide the nine atmospheric bar pressure that is required to extract espresso. This differs from manual piston machines that use levers. The pressure is created by removing tap water from a reservoir and pumping it through a heat exchanger prior being shot through the ground coffee in the group head. Pumps are typically less expensive and last for longer than piston-driven machines. However, both types of machines may degrade because of excessive use and poor cleaning. They also make mechanically complex, which can result in costly prices for even the most basic models. espresso coffee machines for sale eliminate the pump entirely and use steam pressure to brew espresso. This could lead to over-extraction since the boiler that produces steam also warms the water to boil. In addition 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 using a vibrating disc that generates the pressure and rotating models that push hot water through the grounds at high speed. Both machines can make great espresso however rotary machines tend to be more quiet, durable and less likely to fail. The Boiler The boiler is what makes the water warm to the ideal temperature to extract. The resulting steam is then transferred to the portafilter which holds ground espresso beans and gets funnelled down into the cup. During this process the steam causes enough pressure to push the coffee grounds through. This creates a crema on top of the espresso. This is the hallmark of a great espresso. There are three kinds of espresso makers, which differ in the type of pump they use and the degree of heat that the espresso is. There are various ways to control the brew and the size of cup that can be produced by the machine. The first espresso machines were steam-type. The earliest espresso machines were steam-type machines. This resulted in the coffee tasting burnt and bitter. This is the reason Milanese makers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine. The most well-known espresso maker is a semiautomatic machine with an electric pump. These are what people imagine when they think of an espresso machine. Semi-automatic machines require you to grind and tamp the beans yourself however the pump controls the flow of water and pressure. This is a great compromise between the human touch and mechanized accuracy. The Filter Typically, espresso machines have filters to separate the coffee grounds as they pass through the hot water. The filter is also an essential component of the machine's temp control, since it stops overheating. Filters also aid in flavor since it allows for an extended flowering time. This allows the beans to 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 as well as the extraction, are still crucial. It's here that the magic takes place. This is what makes espresso taste so good. The grouphead, also referred to as the brew head, is the place where the portafilter (the thingy you put the ground coffee in) is placed when making espresso. In the steam-driven espresso machine hot water is heated in an airtight tank to create steam. This is then pushed through the grounds under high pressure. These machines are cheaper and easier for the user to maintain than pumps-driven models. However, they are limited in their capacity to create the perfect conditions for brewing, because they operate at 1-1.5 bars of pressure, while the perfect shot requires 9-10 bars. In recent years, compressed-air-pump-driven espresso machines have become more popular. They utilize an air compressor to force hot water into the ground, and are more mobile than steam-driven electric espresso machines.