This research deals with the analysis of magnetizable hybrid nanofluid of MWCNT-Fe 3 O 4 /H 2 O inside a circular cavity with two circular heaters. A wire carrying electrical current has been located in the center of each heater. The magnetic fields strengths created by the wires carrying electrical current are not the same. The governing parameters studied includes Rayleigh number ( Ra = 10 4 to 10 6 ), location angle of heaters α = 0–π/2, the magnetic strengths ratio parameter γ r = 0.2–5, magnetic number Mn f = 0–1000, Hartmann number Ha = 0–50, nanocomposite particles concentration φ = 0–0.3%. Results demonstrate that dispersing the hybrid nanoparticles of MWCNT-Fe 3 O 4 inside the host fluid augments the convective heat transfer .