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I am installing an outdoor heater that is 3000 watt, 12.5 amp, 240 v. What size breaker and wire should be used?

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  • Is it labeled 12.5 amps, or are you just assuming that from 3000W? What do the instructions say to use?
    – Harper - Reinstate Monica
    Oct 7, 2020 at 4:04

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To just answer your question, You will need #12 AWG wire which is good for 20 Amps and a 20 Amp breaker. If you add more information about the location and the heater, we might be able to help out with the installation.

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