Energy transmission and storage are vital in modern applications, especially for photovoltaic thermal (PV/T) applications. One of the significant advancements employed in these applications is phase change materials (PCMs), which offers improved thermophysical characteristics. In this regard, embedded Paraffin wax (PW) and amorphous TiO2 (a-TiO2) nanoparticles (NPs) were prepared. The sonochemical hydrolysis method is used to produce a-TiO2 NPs. The embedded concentrations of a-TiO2 NPs in PW in this study are 0, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, and 0.5 wt%. The morphological features of synthesized a-TiO2 NPs as well as PW/a-TiO2 nanocomposites (NCs) were examined by field emission scanning electron microscope (FE-SEM). Differential scanning calorimeter (DSC) investigations were used to determine the viability of these materials for thermal storage by evaluating the effects of various a-TiO2 NP concentrations on the melting point (Tm), latent heat rate (SP), and latent heat of fusion (LH) of PW. PW/a-TiO2 NCs had LH and SP values that are higher than those found in pure PW samples. SP value increased with TiO2 content up to 0.25 weight percent before declining with additional contents. While LH was improved with TiO2 up to 0.15 wt% content and subsequently dropped for additional contents. LH and SP values for PW/a-TiO2 NCs were significantly improved compared to pure PW samples by 19.1% and 298.6%, respectively.