The magnetic energy on demand water heater also named instant hot water heater is a kind of magnetic energy heating principle. It uses the principle of magnetic energy induction to convert electric energy into heat energy. The rectification circuit converts 50Hz/60Hz alternating current into direct current voltage, and then converts the direct current voltage into a high frequency of 20KHz through the control circuit. The frequency voltage and the high-speed changing current generate a high-speed changing magnetic field through the coil. When the magnetic field magnetic field passes through the heat-conducting body, hundreds of thousands of small vortex flows are generated in the heat-conducting heat-conducting body at a 360-degree peripheral speed to magnetically collide and cut the heat conductor. Heating and magnetizing water flowing through the conductor body.