Good advice was given, for the OP's direct question use 12 gauge regardless of amp load due to his saying he may run 75 ft. Plus, since you said the pellet stove is plugged into a power strip, there's always the possibility that something else gets plugged in.
I TOTALLY agree with those suggesting correctly done generator wiring. It isn't expensive, gives a lot of comfort in the case of an extended outage, and is SAFE. You can do the sub panel as many suggest, I've chosen to do the full breaker panel capability where all circuits are available.
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