Monobloc boiler, three smoke passes (two in combustion chamber), at pressurized combustion, equipped with wide furnace at flame reverse, with furnace back completely wet, connection for starting condensate discharge placed on the smoke chamber, internal course of the water studied in order to cool the anterior part and increase the temperature in the rear part of the boiler to reduce the starting condensate. Suitable to work with gas, LPG, light oil or heavy oil fuel. The boiler SupeRAC is suggested to be used in heating plants with hot water up to 110° C, for Italy (for export working temperature 115°C), with working pressure 6 bar (on request 8 or 10 bar).