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The main element of the Computer Controlled Hot Water Production and Heating Teaching Unit, "EACC", is the boiler. Its function is the heating of the water that will flow through the other elements transferring its heat. It is a low temperature boiler that works with gas-oil and it is suitable to work with pressurized burners for gas or gas-oil. The boiler includes an stage gas-oil burner, circulating pump, closed expansion tank, safety valve, air purger and drainage valve. The burner has an On/Off operation. The mechanical atomization of gasoil at high pressure is made through a nozzle. Also, it allows to obtain combustion optimum values by means of the regulation of the combustive air (manually) and the deflector. The unit includes an electronic three-ways valve, which distributes the water which has been previously heated by the boiler-burner group into two primary circuits. One of them is the double jacket of the hot water tank, to obtain domestic hot water, and the other is the radiator, to generate heating. The hot water tank has a double jacket through which water previously heated in the boiler flows, constituting the primary circuit. There is a solenoid valve in the lin