The purpose of this work is to study the boiling heat transfer mechanisms in microgravity. Subcooling is one of the important parameters defining the bubble growth process. In this work, we have analyzed the effect of subcooling on bubble nucleation and growth. The bubble diameter was evaluated in time using the developed algorithm. Several stages of bubble growth were highlighted. The effect of subcooling on the bubble growth rate was analyzed. It is shown that subcooling has a significant effect on all stages of bubble growth. A numerical model has been developed to help the better understanding of the bubble growth phenomena. The numerical and experimental results have been compared to analyze the effect of subcooling on bubble growth. Some observations couldn't be explained without evoking the presence of non-condensable residuals. The amount of these was estimated.