The invention discloses an efficient and reliable
induction heating device. The device comprises a
metal heating body internally provided with a hot water cavity, an isolation part arranged on the outer side face of the
metal heating body in a sleeving manner, an insulation heat conduction part, an
electromagnetic induction coil, a rotating part and a spiral part; a heating cavity is arranged between the inner side face of the isolation part and the outer side face of the
metal heating body; the insulation heat conduction part is made of heat conduction materials, and a preheating cavity is formed between the insulation heat conduction part and the isolation part; the
electromagnetic induction coil is wound on the insulation heat conduction part; the first end of the preheating cavity communicates with a cold
water pipe, the second end of the preheating cavity communicates with the second end of the heating cavity, the first end of the heating cavity communicates with the first end ofthe hot water cavity, and the second end of the hot water cavity communicates with a hot
water pipe; the rotating part is arranged in the heating cavity, the spiral part is arranged on the outer sideface of the metal heating body in a sleeving manner, and the
tail end of the spiral part is fixedly connected with t he rotating part; and water scales generated on the surface of the metal heating body can be completely eradicated, failures caused by the high temperature of the
electromagnetic induction coil can be reduced, and the
electric energy conversion efficiency, the
heat energy utilization rate and the heating speed are improved.