Small apt complex in Huntington Beach, Ca. consists of 8 individual units. The gas water heater for 4 units resides in the small laundry room where there is a single duplex outlet that the washer and dryer is plugged into. The rather large water heater, in the opposite side of the small room needs 120 Volts to power it's solid state goodies. What is the best way to get from the Receptacle behind the washer/dryer to the water heater about 12 feet away. The water heater has no pig-tail or any-thing, just 3 stranded wires (black, white and green) at it's own electrical enclosure. Can I do this externally some-way along the inside walls and be "LEGAL" Thanx in advance.