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19 times 120 = 2280 watts. 19 amps on a 20 amp breaker is kinda pushing your luck. I would go to a single pole 30 amp breaker because a motor starting draws about 125% of nameplate amps before it reaches its running amps PLUS you have a resistive load (the heater element) Does your garage have a sub panel or are you looking at running the circuit back to the main panel?
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