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  1. #1
    Join Date
    Apr 2008
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    Upstate New York
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    how many amps does a water heater draw

    I have a 220 volt water heater with I believe a 1500 watt elements, how many amps does it draw ?? Its on a 30amp breaker

  2. #2
    Join Date
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    Amps x Volts = Watts

    Watts / Volts = Amps

    1500 / 220 = 6.8
    Ed J

  3. #3
    Join Date
    Feb 2011
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    North East Ohio
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    1500/220=6.8 amps (I think) How many elements?

  4. #4
    Join Date
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    Mount Airy, MD
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    Quote Originally Posted by NCHeat View Post
    1500/220=6.8 amps (I think) How many elements?
    Typically there are 2 but, the top one is the priority and the bottom is the second priority. They are staged/selected as such via the upper stat

  5. #5
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    opps read it wrong, it says on the label 4500 at 240 volts so what is it at 220 volts watts and amps ?? It has two elements but only one runs at a time

  6. #6
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    Quote Originally Posted by Chris_Worthington View Post
    Typically there are 2 but, the top one is the priority and the bottom is the second priority. They are staged/selected as such via the upper stat
    Thanks Chris

  7. #7
    Join Date
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    Quote Originally Posted by cvcman View Post
    opps read it wrong, it says on the label 4500 at 240 volts so what is it at 220 volts watts and amps ?? It has two elements but only one runs at a time
    20.45

  8. #8
    Join Date
    Jul 2007
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    Quote Originally Posted by cvcman View Post
    opps read it wrong, it says on the label 4500 at 240 volts so what is it at 220 volts watts and amps ?? It has two elements but only one runs at a time
    Did ya happen to catch Ed's post??

  9. #9
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    Apr 2008
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    yea i saw Ed's but again I have 220 volts not 240 like label says for 4500 watts

  10. #10
    Join Date
    Jul 2007
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    Mount Airy, MD
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    Quote Originally Posted by cvcman View Post
    yea i saw Ed's but again I have 220 volts not 240 like label says for 4500 watts
    The formulas that Ed gave would the same for anything that is a constant load (Inductive Load) to include light bulbs

  11. #11
    Join Date
    Jul 2007
    Location
    Mount Airy, MD
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    7,281
    Watts / Volts = Amps

    4500/220 = Chris to lazy to calculate this for you

  12. #12
    P=VI
    I=P/V 4500/240=18.7 amps
    V=IR
    R=V/I 240/18.7=12.8 ohms
    I=V/R 220/12.8=17.1 amps
    P=VI 220*17.1=3751 watts

  13. #13
    Join Date
    Jul 2007
    Location
    Mount Airy, MD
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    Quote Originally Posted by heathkit View Post
    P=VI
    I=P/V 4500/240=18.7 amps
    V=IR
    R=V/I 240/18.7=12.8 ohms
    I=V/R 220/12.8=17.1 amps
    P=VI 220*17.1=3751 watts
    Always nice to see someone with a calculator handy

    And BTW, welcome to the site

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