Differences between a coffee bar professional espresso machine and one espresso coffee machine for home use
Wrote at 16:39 by Stefano Urso in: Coffee Quality,
The functions of the professional espresso coffee machine that we find into coffee bars are quite similar the one there are into a coffee machine for home use. The two machines are similar under a procedural point of view, what varies is the size (in particular of the internal elements) which are then reflected on the final quality of the extracted espresso.
Conceptually, a professional espresso coffee machine is made up of a boiler containing boiling water to about 1.2 bar. When we hit the button we draw an amount of water from the boiler: after a few seconds of pre-infusion, the pump force the water through the pod of ground coffee, extracting the coffee substances and smells in a very energetic way.The coffee bar professional espresso machine is always composed of the following essential elements: Boiler
: usually it’s made of steel, copper or brass. Its purpose is to heat and maintain hot water through a heat exchanger. Electric pump
: it’s the tool capable of crushing the water against the coffee pod with a pressure around 9 atmospheres. A pressure gauge on the machine should indicate this extraction value.Group
: is the arm which is held to attach and remove the doses of coffee. In addition to the knob it has a container shape which houses the pressed grinded coffee. The difference between a coffee machine for home use and the coffee bar version is into the sizes
: the home machines have a smaller boiler and also the light structure (e.g. smaller in dimensions and steel use) will never permit to maintain the pressure, and so the hot water, in the best way.