In this study; energy production, fuel consumption and chimney gas emission values of sunflower stalks in two different forms were measured on three types of grates and under three different burning conditions. Concen-tration and mass flow values of chimney gases (CO, $SO_2$, $NO_x$) measured in the experiments were compared both with each other and with the limits given in the Regulation of Protection Air Pollution. The highest boiler efficiency in the burning experiments of sunflower stalks in the first and second forms were reached in the front natural air draft burning condition of the circle grate with 25,1 and 30,5 %, respec-tively. The highest boiler combustion heat power values were obtained from bottom natural draft and bottom forced draft burning conditions of mixed hole grate with 266445 and 240660 kJ/h, respectively. The burning experiments with the lowest CO values belonging to the first form of sunflower stalk were realised in the bottom natural draft burning condition of mixed hole grate and oblong hole grate with 2834,8 and 2953,9 mg/$Nm^3$, respectively. In the experiments with the second form, the lowest CO quantity was obtained in the bottom force draft and bottom natural draft burning conditions of oblong hole grate with 1626,3 and 1765,5 mg/$Nm^3$, respectively. The smaller air inlet hole area of circle grate leaded to insufficient air inlet into the combustion chamber of bottom natural draft and bottom force draft burning conditions of this, in turn brought about an increase in CO emission due to incomplete burning.