Does a 240 volt water heater have 3 or 4 wires from it Question & AnswerRelated QuestionsQuestionDoes a 240 volt water heater have 3 or 4 wires from it? I asked a question about water heaters yesterday, and got many useful answers. I am concerned about running a water heater clearly marked 240 volts ac on a 120 colt ac line. Answerif your new water heater is "clearly marked" 240v, then that is what it takes. Now, the wires. The three wires on the unit- black, white and bare. the black is a "hot" and the white is a "hot", the bare is a ground. In the electrical panel, both the blSee more on answersoFollowers: 1Answers: 5Status: OpenPublished: Apr 04, 2008 Electrical Wiring for a 240 Volt Wall Heater Typically a 240 volt heater will have three wires in a junction box or connection area. A dedicated circuit containing 3 wires, two will be the 240 volt lines and one will be the ground wire. The circuit size is determined by the required electrical load of the heater which is measured in watts or amps.
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