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https://www.coffeee.uk/products/compact-espresso-and-cappuccino-machine-with-milk-frother

How Does Machine Espresso Work The machine espresso is made using precise pressure and filtering system that is aweinspiring to make the coffee you enjoy But how exactly does it work Espresso is made by forcing hot water at high pressure through finelyground coffee The process is similar to that of making drip coffee However the pressure is the main difference The Group Head The group head is the portafilter is inserted when you are making espresso It is responsible for dispersing the water into the portafilter before controlling the pressure of the resulting extraction There are a variety of types of group heads each with its distinct advantages and drawbacks Some focus on temperature stability while others on preinfusion capabilities while others are designed to control the lever There are also some that have a combination of features like the E61 one which is the most popular choice among baristas due to its ability to offer multiple perks in a single package As you can see in the photo above the group head has several notches where you place your portafilter before twisting it manually to lock it in A gasket made of rubber is placed in the notches to create a seal while you insert your portafilter The notches allow for precise placement of your portafilter This is vital for an accurate extraction The group head is not just able to allow you to place your portafilter easily however it also keeps an even temperature This is done by cycling hot water around the portafilter and through the brewbasket ensuring that the temperature is always at the right level to extract the coffee It is crucial to keep in mind that even a tiny deviation can make the difference between a good and a excellent espresso The Pump The motorized pumps that are used in espresso machines that rotate provide the nine atmospheric bar pressure needed to extract espresso This differs from manually operated piston machines that employ levers The pressure builds up by removing tap water from a reservoir and pumping it through a heat exchanger prior being shot through the ground coffee inside the group head Pumps are typically less expensive than pistondriven machines and tend to last longer however both types of machine can get damaged through overuse and lack of cleaning Pumps are also more complicated mechanically which could increase the cost of even simple models Certain espresso machines utilize steam pressure instead of a pump to brew espresso This can cause overextraction because the boiler that makes steam also heats the water to boil These machines also have to continuously rebuild their pressure between cups This takes energy and time Many espresso machines make use of either a vibration or rotary pump A vibration model employs an oscillating disk to create pressure while the rotary model pushes hot water through the ground at high speed Both machines can make great espresso however rotary machines are more stable quieter and less likely to break down The Boiler The boiler will heat the water to the right temperature for extraction The steam produced is then directed to the portafilter which holds the espresso grounds The steam is then channeled into the cup During this process the steam causes enough pressure to push the grounds of coffee through This results in a layer of crema on top This is one of the main characteristics of a great espresso There are three kinds of espresso machines each with different types of pumps and brew temperature There are also different ways that the brew can be controlled as well as the size of the cup that the machine is capable of making The first espresso machines were steam types The earliest espresso machines were steamtype machines This resulted in the coffee tasting bitter and burnt This is the reason why Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine The most wellknown espresso maker is a semiautomatic machine that has an electric pump When people think of espresso machines they imagine these machines Semiautomatic machines require you to grind and tamp your beans yourself but the pump regulates the flow of water and pressure This is a great compromise between the human touch and mechanized consistency The Filter Typically espresso machines employ filters to separate the grounds of the coffee as they go through the hot water The filter is also an essential part of the machines temperature control since it stops overheating A filter also improves flavor as it permits a longer flowering period This lets the beans release their nuances and also allows for better extraction It is important to keep in mind that even the best filter could result in a poor cup of coffee The quality of the beans and the extraction are still crucial Its here that the magic takes place This is what makes espresso taste so delicious The grouphead also called the brewhead is where the portafilter the thing you put the ground coffee in is placed when youre making espresso In an espresso machine that is driven by steam hot water is heated in an airtight tank to create steam Steam is then pushed through the grounds at a high pressure Coffeee are cheaper and easier to maintain than pumpsdriven models They are however limited in their ability for creating the ideal conditions for brewing since they only operate with 115 bar of pressure The ideal shot requires 910 bars In recent times espresso machines powered by a compressed air compressor have become increasingly popular They use an aircompressor to force hot water into the ground and are more mobile than electric steamdriven espresso machines