12 guage - 20 amp
14 guage - 15 amp
But 220 watts? I think you'll find there are two hot
connectors, to be used with 12-3.

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|I am looking to put a four foot baseboard heater in a bedroom . In the past
I could use a 12-2 with a ground. Is that still up to code using 220 power
and if it is what breaker should I use?