Most modern espresso machines rely on an electric pump to generate pressure.
A pressure of roughly 9 bars (130 psi) is needed for each espresso shot. This is nine times the atmospheric pressure at sea level (9 bar).
For example, a PSI of 30 to 35 is recommended for the majority of the automobile tires.
Commercial espresso machines often require a sophisticated rotary pump to maintain constant pressure. This type of pump utilizes a mechanical disc rotating under the influence of electrical current. A typical household appliance is a vibration pump, which utilizes an electromagnetic coil to push and pull a piston.
After the pump moves the water forward, the temperature can be raised. This is just as important as water supply and pressure.
In an espresso machine, the boiler is responsible for boiling the water in the system, as you might anticipate. Professional machinery frequently use a two-boiler setup. In other words, they have a brewing boiler and a steam wand boiler.
Two boilers handle the issue of having various temperature needs. Brewing water should be at 93°C (200°F), while steam should be at 100°C (212°F).
Inconsistencies in extraction rate, which are influenced by water temperature, might alter the flavor of the shot.
Proportional integral-derivative (PID) temperature controls have been added to espresso machines by a number of manufacturers. For optimal boiler temperatures, these handy devices connect to the heating element and control on/off cycles. If you don't have this technology, your espressos will have unpredictable heat levels.
The majority of espresso machines also include a steam wand. This is the espresso machine's side-mounted narrow metal nozzle. Using this thin hose, the steam wand directs hot steam from one of the two boilers into the milk. In order to make cappuccinos and lattes, milk must be heated and textured by pressurized steam.
The Group Head & Portafilter
These two components come into contact with one another at this point before it reaches your cup.
Group heads come in a variety of shapes and sizes, but they all share the same basic features. This is where the portafilter — the metal basket that holds the ground coffee – is. There is a portafilter lock, a pressure switch (to control boiler pressure), and a path for water flow through the group head.
There is no comparison between espresso machines and other types of devices, such as pod machines or filter machines. "They basically brew different beverages with varying concentrations."
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Other Questions about Coffee
OCM (OnCoffeeMakers.com) was started in 2007 with the first webpage about coffee machines. And for a number of years, we focused on helping people find their desired coffee machine (we still are helping folks with that! So, if you are looking for coffee machines for office or restaurants - check out the link).
In 2010, we started getting enquiries on restaurant marketing and we start to help food and beverage brands with their marketing. Below are campaigns and events that we have done over the years:
OCM's campaigns: F&B Marketing Ideas by OCM
OCM's Events: F&B Industry events by or with OCM
Check out this restaurant marketing guide to learn more about the many campaigns and companies we have worked with.
Since then, we have also created many marketing workshops and classes for the F&B industry. Many of these modules are still running in tertiary institutions such as Temasek Polytechnic Skillsfuture Academy and also ITE College East COC classes, below are some snippets of our lectures and workshops:
OCM’s F&B workshops: Food and Beverage Marketing Lectures | Workshops - click to watch classes on customer journey map, JTBD and more.
So, if you are looking for industry practitioners to help you scale your coffee or F&B businesses, do drop us a message or book an appointment. Do also check out our various social media platforms on regular F&B and coffee market updates:
For regular coffee (F&B) related videos: OCM Youtube
For Daily Coffee Inspiration (fun coffee content): OCM IG
For insights into the coffee (F&B) industry: OCM LinkedIN
PS: For the coffee lovers, we continue to share coffee articles (and videos) and have also started a free coffee class section (with free online coffee training supported by coffee partners).