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    bsivell1's Avatar
    bsivell1 Posts: 1, Reputation: 1
    New Member
     
    #1

    Sep 4, 2018, 08:39 AM
    30 gal electric water heater
    I have a 30 gallon electric water heater that is 220v. It has the standard 10/2 wiring going to 2 15 amp circuits at the panel. Can I made 240v using the same 10/2 wiring and 2 15 amp circuits. If not what changes do I have to make?
    ma0641's Avatar
    ma0641 Posts: 15,681, Reputation: 1012
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    #2

    Sep 4, 2018, 12:59 PM
    220 VAC has not existed in the US for quite a while, it has been 240VAC. Today, power is supplied to you home in two 120 VAC phases. No changes are needed. Are you replacing the HW heater?
    massplumber2008's Avatar
    massplumber2008 Posts: 12,776, Reputation: 1210
    Senior Plumbing Expert
     
    #3

    Sep 4, 2018, 02:18 PM
    Hi Bsivell

    Your breakers are SERIOUSLY undersized here. You should have a 30 AMP double pole breaker for a water heater... that is a 1 piece 30 Amp double pole breaker that supplies 30 amp to each leg of the water heater. In fact, this is a dangerous set up that could eventually lead to someone (usually a homeowner) getting hurt because they might make the mistake of shutting only one breaker off thinking they shut off the entire circuit, go to work on the water heater and get zapped with some serious juice, right?

    Consider updating the panel to a 30 AMP double pole breaker for safety sake (much more efficient heating water using correctly sized breakers! ).

    Agree with Ma0641 on 220V vs 240V... get a meter

    Mark
    Milo Dolezal's Avatar
    Milo Dolezal Posts: 7,187, Reputation: 522
    Plumbing Expert
     
    #4

    Sep 5, 2018, 10:22 AM
    Very good point, Mark. Glad you noticed this Code violation, and brought it to Bsivell1's attention

    Milo
    massplumber2008's Avatar
    massplumber2008 Posts: 12,776, Reputation: 1210
    Senior Plumbing Expert
     
    #5

    Sep 5, 2018, 02:03 PM
    I appreciate that, Milo. I just hope Bsivell returns to the thread!

    Good day!

    Mark
    ma0641's Avatar
    ma0641 Posts: 15,681, Reputation: 1012
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    #6

    Sep 5, 2018, 07:19 PM
    If the OP is using a 15 AMP on a 10AWG, it won't hurt anything, just really heats the water much more slowly. However, it sure is easy to snap in a double 30, that's what I have in our mountain cabin.
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #7

    Sep 10, 2018, 08:50 AM
    Poster never mentioned Watts. Many/Most are 240 Volts on a 30 Amp 2 Pole Breaker.
    15 Amp Breaker(s) should have tripped. 15 Amps @ 240 Volts is 2880 Watts.
    15 X 240 = 2880.
    At least the wire is Correct, as Mentioned by massplumber, 2 Pole 30 is needed
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #8

    Sep 13, 2018, 07:50 AM
    #12 may be correct depending on Watts?

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