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What size wire do you use for 120v 1500w hot water tank

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  • What size wire do you use for 120v 1500w hot water tank

    I found following chart for safe capacity for #14 wire
    --------------------------------------------------------------------
    Amps x Volts | Total Capacity | Safe Capacity
    15 A x 120 V | 1800 watts | 1440 watts
    --------------------------------------------------------------------
    When I install a hot water tank which has 1500W with 120V
    Is 1500W element good with #14 wire which is 1440 watts with
    safe capacity according to above chart?
    Or should I use #12wire instead of #14?

    It would be great if you give some advice.
    Thank you.

  • #2
    Re: What size wire do you use for 120v 1500w hot water tank

    I don't know Canadian code, but in the US you would need #12 and a 20A breaker.

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    • #3
      Re: What size wire do you use for 120v 1500w hot water tank

      Thank you!

      Usually, I just install or replace hot water tank and hook up wire which already prepared by electrician.

      I saw a lot of times 14awg bx cable, but also 12awg bx cable.

      So When I see 14 awg wires for 120V 1500W HWT, should I mention that wires should be redone with 12awg?

      Comment


      • #4
        Re: What size wire do you use for 120v 1500w hot water tank

        Around here, that application would require you derate the conductor to 80% of it's listed ampacity.....so #12=20A*.8 which means #12=16A.
        Ideal Plumbing

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        • #5
          Re: What size wire do you use for 120v 1500w hot water tank

          Originally posted by idlplumb View Post
          Around here, that application would require you derate the conductor to 80% of it's listed ampacity.....so #12=20A*.8 which means #12=16A.
          That's what I meant by in the US. Storage type water heaters require 80% circuit derating.

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          • #6
            Re: What size wire do you use for 120v 1500w hot water tank

            Thank you for your replies.

            I have to potable heaters at home.

            One is manufactured by Airwork 120v 1500w fan heater,
            and the other one is made by Presto 120v 1500w heatdish.

            I do not use above two heaters at the same circuit but use different circuit.

            S, those 120v/1500w potable heaters use same size heating element
            with 120v 1500w hot water tank element.

            Does 80% derating rule apply to those potable heaters? or only when connect with hard wiring such as hot water tank?
            If the rule apply to them the circuit should be 20A with 12awg wire.

            I know my kitchen outlets is 20A with 12awg which does not trip my breaker when I used microwave and electric kettle at same time.

            Does out serve for potable heaters I mentioned above should be 20A with 12awg?

            I believe everybody connects those heater to any 120v outlet....

            Comment


            • #7
              Re: What size wire do you use for 120v 1500w hot water tank

              I'm pretty sure it only applies to hardwired heaters. I am not 100% sure on that though.
              Ideal Plumbing

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