Experimental studies on the effect of adding an adjuster on the heating efficiency and flame stability of sago waste briquettes have been carried out. The adjuster keeps the burning distance constant thereby increasing the combustion heat of the fuel. The infrared thermometer is used to determine the evolution of the combustion temperature in the briquette and the combustion load (water in the pan). The results show that the addition of a success adjuster increases the performance of the briquettes and the stove so that it becomes more effective and efficient, where the combustion temperature increase and the water boiling time is faster. Moreover, the results showed that the stable burning distance makes the briquettes always get stable heat so that the used fuel is more effective, where all parts of the fuel can burn and transfer heat to the pan. From the molecular perspective, it can be seen that the stability of the burning distance is able to weaken the Van der Waals bonds of the carbon chain, increasing the reactivity of fuel molecules and the fuel is easy to absorb heat and is flammable.