Preheating device boiler water combustion. # The preheating device water comprises a sealed container (1) with a central hole (13), a heat exchanger of parallel tubes (2) or a heat exchanger coil ( 4) and a cover (3). The airtight container (1) has an anti-corrosion treatment in the center hole (13) and a flue outlet acids (14) during cooling of the flue gases. The device carries a heat transfer fluid in a closed and depressurized (9) circuit. # The flue gases from the boiler heat the inner tube of the device, which transfers the heat to heat transfer fluid which is submerged exchanger heat (2 or 4). Heat the heat transfer fluid passing through the water inside the tubes of the heat exchanger is heated by preheating the water before entering the boiler.
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