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This study aims to determine the heat produced from the heating system of the fluidized bed dryer on corn drying process and to calculate the thermal efficiency of the heating system. The method used was experimental with three variables of biomass of 3.5 kg, 4 kg and 5 kg. The corn initial moisture content of around 22% is used and the heating equipment used are a biomass furnace and heater. The parameters in this study are temperature, material moisture content, and thermal efficiency of heating system and biomass furnace. The biggest thermal efficiency of heating system at air velocity 12.19 m/s and material mass of 3.5 kg at 14.93%. The value of thermal efficiency of the largest biomass furnace system at air velocity 12.19 m/s and 3.5 kg material mass of 74.68%.