I just purchased a gutter heater (yes I know it may not actually work), and the user's manual said not to use an extension cord. We don't have any outlets within the 6 foot range of the cord on the heating cable.

Is there not a specification of extension cord that could be used?

1 Answer 1


In your place, I would try to find the shortest length (25' maybe) of gauge 12.

  • cord should be sized for the current and rated for outdoor use.
    – agentp
    Commented Jan 20, 2018 at 21:33
  • 1
    You can also fab exactly the cord you want using cordage or by truncating an extension cord of correct rated cordage, gauge and condition. Commented Jan 20, 2018 at 21:37
  • 1
    12 awg cord would be fine even at 50'. All the tape style heaters I have seen are rated for use on a 15 amp circuit, cords are rated differently than house wiring so in reality a 14 gauge cord will be sufficient in size.FWIW The failure point on most cords is the ends, not the conductors.
    – Ed Beal
    Commented Jan 21, 2018 at 2:03

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