Multi-beam microwave heating based on the wave confinement of hexagonal pho- tonic crystal multilayered cavity is reported. The proposed hexagonal cavity is formed by alter- native layers of alumina (Al2 O3 ) and air with the thickness of 0.3a and 0.7a respectively, where ‘a’ is the lattice constant. The 17 layer cavity is normally excited with six microwave beams with the peak strength of 1000 V/m. The center of the cavity is loaded with a low loss dielectric and electromagnetic thermal co-simulations are carried out to study the heat transfer due to multi-beam confinement. It is found that characteristic modes of the proposed cavity show the temperature raising rate of 0.77◦ C/s, 190.26◦ C/s and 29.52◦ C/s at 13.855 GHz, 14.54164 GHz, and 14.78175 GHz respectively. This feature is highly useful for arriving the higher temperatures and the creation of plasmas. Particularly, it is anticipated that the proper scaling of the pro- posed cavity at laser length-scales provide an excellent source of laser beam heating in industrial welding and green photonic solutions.