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https://www.coffeee.uk/categories/espresso-coffee-machines

How Does Machine Espresso Work Machine espresso utilizes precise pressure and mindblowing filter technology to create the perfect cup of coffee What exactly is it that makes it work In order to make espresso hot water is pushed under pressure through finely ground 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 place your portafilter when brewing espresso It disperses the water into the portafilter and then regulates 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 others on preinfusion capabilities while others are designed to control the lever Some come with a combination of both such as the E61 This is a preferred choice for baristas as it provides a variety of advantages in one package As you can see in the image above the group head comes with several notches to place your portafilter and then twist it manually to secure it A gasket made of rubber is positioned inside the notches which helps create a seal when you insert your portafilter The notches on the head permit an exact placement of the portafilter which is vital for an efficient extraction Aside from allowing you to easily connect your portafilter the group head is responsible for maintaining an even temperature It does this by cycling hot water through the brew basket and around the portafilter making sure that it is always at the correct temperature for extraction This is vital because just a few degrees could make the difference between good and great espresso The Pump Motorized pumps in espresso machines that rotate provide the nine atmospheric bar pressure needed for espresso extraction This differs from manual piston machines that rely on a lever This pressure builds up by removing tap water from a reservoir and pumping it through a heat exchanger before being shot through the ground coffee in the group head Pumps are typically cheaper and last longer than pistondriven machines However both kinds of machines can degrade due to overuse and inadequate cleaning Pumps are also more complicated mechanically which can increase the cost of even simpler models Some espresso machines can eliminate the pump completely and instead employ steam pressure to create espresso This could lead to overextraction since the boiler that produces steam also heats the water until it comes to a boil The machines must also continually rebuild their pressure between cups This requires energy and time Many espresso machines employ the rotary or vibration pump with a vibrating model using a vibrating disc that generates the pressure and an rotary model that pushes hot water through the grounds under high speed Both machines can make excellent espresso but rotary machines are more stable quieter and less likely to break The Boiler The boiler is the part which heats the water to the ideal temperature to extract The resultant steam then reaches the portafilter which contains the ground espresso coffee and is then funneled down into the cup In this process the steam creates pressure and pushes through the grounds of the coffee This creates a crema on top of the espresso This is the hallmark of a great espresso There are three types of espresso machines each with a different type of pump and the temperature of the brew There are a variety of ways that the brew can be controlled as well as the size of the cup the machine can produce The first espresso machines were steamtype They had one boiler to create both steam and brew however the pressure they could produce was not very high two bars of atmospheric pressure maximum This led to the coffee tasting bitter and burnt The modern espresso machine was invented by the Milanese producers Luigi Bezzerra Desiderio Pavoni The most common espresso machine is a semiautomatic with an electric pump These are the things people think of when they think of an espresso machine Semiautomatic machines require you to grind and tamp the beans by yourself The pump however regulates the flow of water and pressure This is a perfect combination of human control and mechanized accuracy The Filter Typically espresso machines employ a filter to separate out the coffee grounds as they pass through the hot water The filter is also an essential part of the temperature control system since it helps prevent the machine from overheating It also enhances flavor as it allows for a longer bloom time This lets the beans let their nuances out and allows for better extraction It is important to keep in mind that even the most efficient filter can result in a bad cup of coffee The quality of the beans as well as the extraction are still very important Its here that the magic occurs This is the reason why espresso tastes so good The grouphead also called the brewhead is where you place the portafilter which is the thingy that you put the grounds of coffee into when making espresso In the steamdriven espresso machine hot water is heated in an airtight tank to create steam This is then pushed through the grounds with high pressure These machines are cheaper and are easier for the user to maintain than pumpsdriven models Coffeee UK are however limited in their ability to create the perfect brewing conditions as they only operate with 115 bar of pressure The perfect shot requires 910 bars In recent years espresso machines powered by compressed airpump have become increasingly popular They utilize an air compressor to force hot water through the ground and are more mobile than steamdriven electric espresso machines