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https://www.coffeee.uk/products/de-longhi-la-specialista-barista-espresso-maker-1450w
How Does Machine Espresso Work The machine espresso uses precise pressure and filtering technology that is amazing to create the coffee you love How exactly does it work Espresso is produced by pushing hot water at high pressure through finelyground coffee The process is similar to making drip coffee but the key difference is in the pressure The Group Head The name implies the group head is the place you insert your portafilter when making espresso It disperses water into the portafilter and regulates the pressure of extraction There are a variety of types of group head each with its own advantages and drawbacks Some focus on temperature stability whereas others on preinfusion capabilities while others are designed to control the lever There are even some that come with a range 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 above photo the group head comes with many notches in which you can put your portafilter then twist it manually to secure it A gasket made of rubber is positioned inside the notches to help create a seal as you insert your portafilter The notches permit precise placement of the portafilter This is crucial for an efficient extraction Aside from allowing you to effortlessly insert your portafilter the group head is also responsible for maintaining an even temperature espresso machines uk Coffeee UK does this by cycling hot water through the brew basket and around the portafilter to ensure that its always at the correct temperature to extract It is important to note that even a tiny variation can mean the difference between a decent and a excellent espresso The Pump The motorized pumps that are used in espresso machines that rotate provide the nine atmospheric bar pressure that is required to extract espresso This is different from manual piston machines that rely on levers This pressure builds up by drawing 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 they tend to last longer However both types of machines may degrade with overuse and insufficient cleaning Pumps are also more complicated mechanically which can increase the cost of even simple models Certain espresso machines remove the pump entirely and employ steam pressure to create espresso This can result in overextraction because the boiler that makes steam also warms the water to boil Additionally these machines typically have to rebuild their pressure between cups which requires time and energy Many espresso machines make use of a rotary or vibration pump A vibration model makes use of a vibrating disk to generate pressure while the rotating model pushes hot water through the ground at a fast speed Both models can make a great espresso but Rotary machines are quieter and more durable than vibration pumps The Boiler The boiler makes the water warm to the perfect temperature for extraction The steam produced will eventually reach the portafilter which is a container for espresso grounds It is then funneled into the cup During this process the steam is able to create enough pressure to push the coffee grounds through This results in a layer of crema that is then poured over This is one of the main characteristics of a good espresso There are three kinds of espresso makers They differ in the type of pump they use and the degree of heat that the brew is There are a variety of ways that the brew can be controlled and the dimensions of the cup the machine can make The earliest espresso machines were steambased The earliest espresso machines were steamtype machines This resulted in the coffee tasting bitter and burnt This is why Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni created the modern espresso machine The most commonly used espresso machine is a semiautomatic that has an electric pump This is what people envision when they think of an espresso machine Semiautomatic machines require you to grind and tamp your beans yourself The pump however regulates the water flow and pressure This is a fantastic combination of human control and mechanised accuracy 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 essential part of the machines temperature control as it prevents overheating A filter also improves flavor since it allows for a longer flowering period This lets the beans release their flavor and improves extraction However it is important to keep in mind that even a top filter can produce a bad cup of coffee since the quality of the beans and extraction is vital Its here that the magic occurs This is the reason why espresso tastes so delicious The grouphead also called the brewhead is where you place the portafilter the device that you put the coffee grounds into when making espresso In a steamdriven espresso machine hot water is heated in an airtight container to create steam Steam then pushes the hot water through the grounds at a high pressure These kinds of machines are generally less expensive and easier to maintain than pumpdriven models They are however limited to create the perfect conditions for brewing as they only operate with 115 bar of pressure The ideal shot requires 910 bars In recent years espresso machines powered by a compressed air compressor have become increasingly popular They use an air compressor to force the hot water through the grounds and are much more portable than steamdriven electric machines
