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Many engineering applications such as nuclear reactor, electronics cooling etc are employing multiphase heat transfer instead of single phase. The single-phase heat transfer in many applications offers low cooling efficiency. The conventional fluids such as water, ethylene glycol and oils are not sufficient to recover large amount heat. Due to large amount of latent heat of the conventional liquid, the multiphase heat transfer is one of the suitable techniques in heat transfer equipments. There are many techniques to enhance the heat transfer in heat exchanging equipments. The passive techniques offer best solution and enhancement of boiling heat transfer coefficient and critical heat flux is achieved in short span of time at low wall superheat condition. In this study, alumina-silica hybrid nanofluid is employed in pool boiling investigations for 0.4% volume concentration. The results revealed that the significant reduction in wall superheat and enhancement in heat transfer coefficient was observed. [ABSTRACT FROM AUTHOR]