How Does https://www.coffeee.uk/products/compact-espresso-and-cappuccino-machine-with-milk-frother ? The machine espresso is made using precision pressure, and filter technology that is mind-blowing to create the coffee you enjoy. How exactly does it work? Espresso is made by forcing hot water at high pressure through finely-ground coffee. The process is similar to making drip coffee but the difference is in the pressure. The Head of the Group As the name implies, the group head is the place you put your portafilter in when making espresso. It disperses water into the portafilter, and regulates the pressure of the extraction. There are several different types of group head, each with their unique advantages and drawbacks. Some are focused on temperature stability, while others on pre-infusion features, and others are designed to control the lever. Some have a combination, such as the E61. This is a favorite among baristas since it provides multiple advantages in a single package. As you can see from the above photo the group head has a number of notches. The portafilter is placed into these notches and twist the head to lock it. There is also a rubber gasket that is a part of the notches, which helps create an airtight seal when you insert your portafilter into the machine. The notches on the head permit an exact positioning of the portafilter which is necessary for a consistent extraction. The group head does not just allow you to put in your portafilter easily however, it also keeps a constant temperature. It does this by circulating hot water through the brew basket and around the portafilter, making sure that it is always at the correct temperature to extract. This is crucial, since just a few degrees could make the difference between excellent and great espresso. The Pump Motorized pumps in espresso machines that rotate provide the nine atmospheric bar pressure that is required to extract espresso. This differs from manually operated piston machines that employ a lever. This pressure is built up by pumping water through a heat-exchanger and then through the ground coffee. Pumps are generally less expensive than piston-driven machines and tend to last longer, although both types of machines could be damaged by excessive use and inadequate cleaning. They also create mechanical complexity 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. This can result in over-extraction because the boiler that produces steam also warms the water to boil. In addition the machines often have to restore their pressure between cups, which takes time and energy. Many espresso machines make use of an rotary or a vibration pump. A vibration model makes use of a vibrating disk to generate pressure, whereas the rotary model pushes hot water through the ground at a fast speed. Both types of machines can make a great espresso, however the rotary pumps are quieter, and more durable than vibration pumps. The Boiler The boiler is what will heat the water to the right temperature to extract. The resulting steam reaches the portafilter, which contains the ground espresso and is then pumped into the cup. The steam generates enough pressure to push the grounds of coffee through. This results in a crema on the top of the espresso. This is a hallmark of a great espresso. There are three distinct types of espresso machines, each with a different type of pump and brew temperature. There are a variety of ways to control the brew and the size of the cup that can be produced by the machine. The first espresso machines were steam-type. The first espresso machines were steam types. This resulted in the coffee tasting burnt and bitter. This is why Milanese makers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine. The most common espresso maker is a semi-automatic device with an electric pump. When people think of espresso machines, they envision these machines. Semi-automatic machines require you to grind and tamp your beans yourself while the pump controls the flow of water and pressure. This is a great compromise between the human touch and the mechanised consistency. The Filter Espresso machines typically have a filter that separates the grounds of coffee from hot water. The filter is also an essential component of the temperature control system since it helps prevent the machine from overheating. It also improves flavor, as a filter allows for a more prolonged bloom phase. This allows beans to release their flavors and provides an opportunity to improve extraction. However it is crucial to keep in mind that even a great filter can make a terrible cup of coffee as the quality of the beans and extraction is still essential. It's in this area that the magic occurs. This is the reason why espresso tastes so good. The grouphead, also referred to as the brew head, is the place where the portafilter (the device you put the ground coffee in) is placed when making espresso. In a steam-driven espresso machine, hot water is heated in an airtight container to produce steam, which is then pushed through the grounds under high pressure. These kinds of machines are usually less expensive and easier to maintain than pumps-driven models. They are however limited in their ability for creating the ideal brewing conditions as they only 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 been gaining popularity. They use an air-compressor to force hot water into the ground and are much more mobile than electric steam-driven espresso machines.