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I have a new Stelpro RUH5-51T heater I'd like to 'safely' install in the garage. It's 240/208 v, 5000/3750 w, 50-60 Hz, 1 phase. The plate on the unit says 20.84 amps. Does this mean I can't use 12 gauge wire with 20 amp breaker? The run from the breaker box would be ~20-25 ft. Do I need to go with 10 ga with 25 or 30 amp breaker? The unit requires the green wire ground connection to the breaker box. Also, conduit protection, can I use flexible metal or do I have to use metal tube? THANKS!!!!!!
 

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You can use 10-2 with ground protected by a thirty amp double. I'd use 3/4 inch flex, but the job would be easier if you use THHN or THWN, instead of NMC with the flex.
 

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