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    mcdoo's Avatar
    mcdoo Posts: 1, Reputation: 1
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    #1

    Oct 8, 2011, 08:31 AM
    Wiring a hot water heater?
    I have 10/2 wire existing, I purchased 10/3 to rewire the new water heater. Black, White and Ground are OK. What do I do with the red that is not needed
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    Oct 8, 2011, 09:36 AM
    If it is a straight 240VAC, you only need the 10/2-Black hot, White hot(make sure to mark it black), ground. If it is, for whatever reason, a 120/240? the black and red are hot, the white is neutral and then ground. If you have already put in the 10/3, use black hot, red hot, and ground, just cap off the neutral. No installation manual? What does the data plate show?
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