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https://www.coffeee.uk/products/de-longhi-ec885m-espresso-machine-in-stainless-steel

How Does Machine Espresso Work The machine espresso is made using precise pressure as well as a filtering system that is aweinspiring to make the coffee you love But how exactly does it work In order to make espresso hot water is forced under high pressure through finely ground coffee The process is similar to making drip coffee but the difference is in the pressure The Group Head As the name suggests the group head is the place you insert your portafilter when making espresso It disperses water in the portafilter and then controls the pressure of the extraction There are several different types of group heads each with their unique advantages and disadvantages Some are focused on temperature stability whereas others on preinfusion features and others are designed to control the lever There are some that have a combination of features such as the E61 that is to be the most popular among baristas because of its ability to offer multiple benefits in a single package As you can see from the photo above the group head is fitted with several notches You place your portafilter in these notches and then twist the head to secure it A gasket of rubber is situated inside the notches which helps create a seal while you insert your portafilter espresso machine uk on the head permit a precise positioning of the portafilter which is crucial for an efficient extraction In addition to allowing you to easily place your portafilter in the group head is responsible to maintain an even temperature This is achieved by cycling hot water around the portafilter and through the brewbasket ensuring that the temperature is at the right level for extraction This is important because just a few degrees could mean the difference between good and great espresso The Pump In contrast to piston machines that are manually operated which rely on a lever that pressurize water rotary espresso machines rely on motorized pumps to provide the nine atmospheric bars of pressure that are required to extract espresso This pressure is generated by pumping water through a heat exchanger and then through the ground coffee Pumps are generally less expensive and last longer than pistondriven machines However both kinds of machines are susceptible to degrading due to overuse and poor cleaning They also make mechanically complex and can lead to the cost of even the most basic models Certain espresso machines utilize steam pressure instead of a pump to brew espresso The drawback is that the boiler that produces steam also increases the temperature of the water to the point of boiling and can result in excessive extraction Additionally the machines often have to rebuild their pressure between cups which takes time and energy A majority of espresso machines utilize either a vibration or rotary pump A vibration model uses a vibrating disk to generate pressure whereas the rotating model pushes hot water through the ground at high speed Both machines produce great espresso but rotary machines are more quiet durable and less likely to break down The Boiler The boiler is the component which heats the water to the ideal temperature to extract The steam that is created will eventually reach the portafilter which contains the espresso coffee 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 a sign of a great espresso There are three kinds of espresso machines each with different pumps and brew temperature There are a variety of ways to control the amount of brew as well as the size of the cup that can be made by the machine The first espresso machines were steamtype They employed a single boiler to make steam and brew however the pressure they were able to create was minimal two bars of atmospheric pressure maximum The coffee tasted bitter and burned This is why Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni developed the modern espresso machine The most wellknown espresso maker is a semiautomatic machine with an electric pump These are the things people think of when they imagine an espresso machine With a semiautomatic espresso machine you must grind the beans and tamp them by hand The pump provides regulated water flow and pressure This is an excellent combination of human control and mechanised reliability The Filter Espresso machines typically have filters that separate the coffee grounds from the hot water The filter is also a vital component of the machines temp control since it helps to prevent overheating It also enhances flavor since a filter allows for a more prolonged bloom time This allows the beans to let their nuances out and provides an opportunity to improve extraction However it is crucial to remember that even a top filter can result in a poor cup of coffee as the quality of the beans and extraction is still crucial This is where the magic happens its the thing that makes an espresso really taste good The grouphead also called the brewhead is where you put the portafilter the thingy that you put the grounds of your coffee into when making espresso In an espresso machine that is driven by steam hot water is heated in an airtight tank to create steam This is then pushed through the grounds under high pressure They are less expensive and easier to maintain than pumpsdriven models They are however limited in their ability for creating the ideal brewing conditions as they only operate with 115 bar of pressure The perfect shot requires 910 bars In recent years espresso machines powered by a compressed air pump have become increasingly popular They utilize an air compressor to push hot water across the ground and are much more mobile than steamdriven electric espresso machines