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How Does Machine Salter EK4369 Barista Pro Espresso Maker 15Bar Work?

The machine espresso makes use of precise pressure and filter technology that is mind-blowing to create the coffee you love. But how exactly does it work?

Espresso is produced by pushing hot water under high pressure through finely ground coffee. The process is similar to making drip coffee. However, the pressure is the main difference.

The Head of the Group

The group head is the portafilter that you insert when brewing espresso. It is responsible for dispersing water into the portafilter and controlling the pressure of the resulting extraction. There are a variety of group heads each with their own advantages and drawbacks. Some focus on temperature stability, some on pre-infusion capabilities, and still others are designed to control the lever. There are also some that contain a variety of features, like the E61 that is to be the most popular among baristas due to its capacity to offer multiple benefits in one package.

As you can see in the above photo, the group head has many notches in which you can place your portafilter and then twist it with your hands to lock it in. There is also a rubber gasket that is a part of the notches and helps to create a seal when you insert your portafilter into the machine. The notches on the head permit a precise placement of the portafilter, which is crucial to ensure an even extraction.

Apart from allowing you easily connect your portafilter, the group head is also responsible to ensure that the temperature remains even. This is accomplished by cycling hot water around the portafilter, and through the brew-basket to ensure that the temperature is constant to extract the coffee. It is crucial to keep in mind that even a small deviation can make the difference between a great and a excellent espresso.

The Pump

The motorized pumps in espresso machines rotary provide nine atmospheric bar pressure that is required to extract espresso. This differs from manually operated piston machines that employ levers. The pressure is created by pumping water through a heat exchanger and then through the ground coffee.

Pumps tend to be less expensive than piston-driven machines, and they tend to last longer, although both types of machine can become damaged due to excessive use and poor cleaning. Pumps are also more complicated mechanically, which could increase the price of even the simple models.

Certain espresso machines can eliminate the pump completely and instead utilize steam pressure to make espresso. The drawback is that the boiler that produces steam also raises the temperature of the water to boiling which could lead to excessive extraction. Additionally, these machines frequently have to restore their pressure between cups, which requires time and energy.

A majority of espresso machines use the rotary or vibration pump, which is a vibration model using a vibrating disc to generate the pressure and the rotary model pushing hot water through the grounds under 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 heats the water to a temperature that is ideal to extract. The resulting steam reaches the portafilter containing ground espresso beans and is then pumped into the cup. In this process, the steam creates pressure and pushes through the grounds of the coffee. This results in a whipped-up top of the espresso. This is one of the hallmarks of a good espresso.

There are three kinds of espresso makers. They differ in the type of pump they employ and the degree of heat that the brew is. There are various ways to control the strength of the brew and the size of cup that can be produced by the machine.

The first espresso machines were steam-types. They utilized one boiler to make both steam and brew however the pressure they were able to produce was very low - just two bars of atmospheric pressure maximum. The coffee tasted bitter and burnt. The modern espresso machine was developed by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most well-known Premium Espresso Machine with Milk Frother - 15 Bars Pressure machine is a semiautomatic model with an electric pump. When people think of espresso machines, they imagine these machines. Semi-automatic machines require you to grind and tamp your beans yourself while the pump controls the water flow and pressure. This is a great compromise between the human touch and the mechanized accuracy.

The Filter

Typically, espresso machines utilize filters to separate the grounds of the coffee as they go through the hot water. The filter is also a vital part of the machine's temperature control, as it prevents overheating.

It also improves flavor as a filter allows for a more prolonged bloom phase. This helps the beans to let their nuances out and provides an opportunity to improve 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, are still crucial.

It's here that the magic takes place. This is what makes espresso taste so good. The grouphead (also known as the brewhead) is where you put the portafilter, the device used to place the grounds of coffee into when making espresso.

Steam-driven espresso machines use hot water that is heated in an airtight container to create steam. The steam then moves hot water through the grounds of coffee at high pressure. They are less expensive and easier for the user to maintain than pumps-driven models. They are however limited in their ability for creating the ideal conditions for brewing since they only operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars.

In recent years, espresso machines driven by compressed air-pump are becoming increasingly popular. They use an air-compressor to force hot water through the ground and are much more mobile than steam-driven electric espresso machines.