but in a single plane as shown the coil 29 is coiled or wrapped around each of the heating rod 16 and preferably having a single domestic hot water inlet 32 and preferably having a single domestic hot water outlet 33 fig6 is a schematic view of the electrical circuitry including the tank 13 without the enclosure 11 referring now to fig6 the operating circuit for the five magnetrons m 35 and a thermal coupler tc 43 is shown a computer 45 is actuated by means of a key pad 47 and a main circuit breaker 49 the voltage supplied is two hundred twenty volts through two electric lines 51 52 each supplying one hundred ten volts the two electric supply lines 51 52 are connected to each of five circuit breakers cb 53 and from each such circuit breaker cb 53 to one of the five magnetrons m 35 a sixth circuit breaker cb 54 is also connected to the thermal coupler tc 43 still referring now to fig6 each of the five coils 29 are shown equally spaced about the tank 13 the wave guide wg 34 as previously stated is placed at the top of each heating rod 16 and to the side of each wave guide wg 34 is the magnetron m 35 the magnetron m 35 generates microwave energy which the wave guide wg 34 directs down the hollow center of its respective heating rod 16 a capacitor c 55 activates the magnetron m 35 through a transformer t 57 a fan f 59 blows on the capacitor c 55 and the transformer t 57 for.