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In this study, the effect of addition of multiwalled carbon nanotubes (MWCNTs) functionalized with ethylenediamine (EDA) to deionized water (DI water) on the heat-transfer performance of a two-phase closed thermosyphon (TPCT) was studied experimentally. The functionalized MWCNTs were characterized by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), NCHS elemental analysis, and transmission electron microscopy (TEM) and were compared with raw MWCNT to confirm the functionalization. Heat-transfer characterization of the nanofluid consisting of EDA-MWCNT/DI-water was studied in different input powers (30–150 W) and various weight concentrations (0.2%–1.5%). The experimental results indicate that, when the input powers are <90 W and the weight concentrations are >1%, the thermal efficiency of TPCT is maximized. This study shows that increasing the input …