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If the heater has a specified branch circuit rating with the manufacturer's information then follow that. If not then assuming it is to be run more than 3 hours per day:

19.7 A x 1.25 = 24.6 A

Next size standard breaker is 25 A (see NEC 240.6)

So you will need #10 AWG Copper and a 25A 2 pole breaker.

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Q: What kind of breaker and wire size do you need for a for a heater that is 208 V 19 A 4100 W 2 wire 1 phase?
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