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Machine parts

The espresso machine is essentially made with the following 4 basic parts:
 

Heat source:

which normally takes the form of an electric heating element or external has burner to heat water and provide steam. In the case of electric hearing, the heating element power defines the heating speed and this can vary according to the size of the boiler tank. The temperature of the water in the tank is controlled and kept stable by a pressure switch and/or by a temperature probe or thermostat.

Boiler tank:

this serves to keep water and steam hot; it can be of various sizes, according to the type and size of the machine and the number of groups. It can be made in different types of metal, but pure copper is the best type because of its conductivity and therefore, thermal inertia. On professional machines, there is a heat exchanger that passes through the boiler tank for each group on the machine. In this case, cold water passes through the exchanger and is heated to optimum delivery temperature. This system is a guarantee of great thermal stability for the whole system, regardless of the intensity of equipment use.

A water pressure system:

to dispense a good espresso, it is necessary for the water pressure to be increased to 9 bar. It is possible to achieve this optimum condition in different ways: with an internal volumetric pump, with an internal vibration pump or using a manual lever.

Delivery group:

the part where the coffee pre-infusion and infusion processes take place. It is an extremely important part of coffee quality since it directly influences the temperature of the water when delivery takes place. The best groups are in solid hot formed brass. The production process prevents the formation of gaps inside the material, leaving the structure sufficiently compact to guarantee a high level of thermal inertia.