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https://www.coffeee.uk/products/swan-gatsby-pump-espresso-machine-black

How Does Machine Espresso Work Machine espresso employs precise pressure and incredible filter technology to produce the perfect cup of coffee How does it work exactly To make espresso hot water is forced under high pressure through finely ground coffee The process is similar to making drip coffee However the pressure is the main difference The Group Head As the name suggests the group head is the place you put your portafilter in when making espresso It distributes water into the portafilter and then regulates the pressure of the extraction There are various kinds of group head each with its particular advantages and disadvantages Some are designed for stability of temperature while others are built to handle preinfusion Others are made to control the lever Some have a combination of features such as the E61 which 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 image above the head of the group has a number of notches The portafilter is placed in these notches then turn the head around to secure it There is also a rubber gasket that resides inside the notches and helps to create a seal when you insert your portafilter into the machine The notches on the head permit a precise location of the portafilter which is necessary for an even extraction The group head not only allows you to insert your portafilter easily however it also keeps the same temperature This is done by cycling hot water around the portafilter and through the brewbasket to ensure the temperature is always right to extract the coffee It is crucial to keep in mind that even a tiny difference can make the difference between a decent and a great espresso The Pump Motorized pumps in espresso machines rotary provide nine atmospheric bars of pressure required for espresso extraction espresso machines uk differs from manual piston machines that rely on a lever The pressure is built by pumping water through a heatexchanger and then through the ground coffee Pumps are generally less expensive than pistondriven machines and tend to last longer but both types of machines can degrade with overuse and insufficient cleaning Pumps are also more complicated mechanically and can add to the price of even the simplest models Some espresso machines eliminate the pump completely and instead employ steam pressure to create espresso The drawback of this is that the boiler that produces steam also increases the temperature of water until it reaches boiling which can cause excessive extraction In addition these machines are often required to restore their pressure between cups which takes time and energy Many espresso machines utilize either a rotary or vibration pump with a vibration model that uses a vibrating disc to create the pressure and the rotary model pushing hot water through the grounds at high speed Both models can make a great espresso however the rotary models are quieter and more durable than vibration pumps The Boiler The boiler is the part that heats water to the optimal temperature for extraction The resulting steam reaches the portafilter that contains ground espresso beans and gets funnelled down into the cup The steam creates enough pressure to push the grounds of coffee through This results in a whippedup top of the espresso This is one of the hallmarks of a great espresso There are three types of espresso makers and they differ in the type of pump they employ and the degree of heat that the coffee is There are a variety of ways that the brew may be controlled and the size of the cup that the maker can create The earliest espresso machines were steam type The earliest espresso machines were steam types This led to the coffee tasting bitter and burnt This is the reason Milanese makers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine The most common espresso maker is a semiautomatic machine with an electric pump When people think of espresso machines they picture these machines Semiautomatic machines require you to grind and tamp your beans yourself however the pump controls the flow of water and pressure This is a perfect compromise between human control and mechanised reliability The Filter Typically espresso machines have a filter to separate out the grounds of the coffee as they go through the hot water The filter is also an essential component of the machines temp control as it prevents overheating A filter can also help with flavor as it allows for a longer flowering period This lets the beans release their flavors and allows for better extraction It is important to remember that even the best filter can make a bad cup of coffee The quality of the beans and the extraction remain vital This is where the magic happens its what makes espresso taste great The grouphead also called the brewhead is where you place the portafilter the thingy that you use to put the coffee grounds in while making espresso Steamdriven espresso machines make use of hot water that is heated in an airtight container to create steam The steam then pushes hot water through grounds of coffee under high pressure They are less expensive and easier for the owner to maintain than pumpsdriven models They are however limited in their ability to create the perfect brewing conditions as they only operate with 115 bar of pressure The ideal shot requires 910 bars In recent years compressed airdriven espresso machines have been gaining popularity They use an air compressor to force hot water into the ground and are more mobile than steamdriven electric espresso machines