I wouldn't expect a 1929 house to have outside outlets as original, so likely added later. If they are GFCI (lift the cover and see the reset button) you should be OK, as those would be more recent. The assumption is that you have a new panel with circuit breakers, not fuses. Is this something you run with an extension cord, (i.e. only runs when attended) or something unattended like a robot lawn mower that is always "on" and self docks for recharge?
I use "Heat Trak" pads to melt snow and ice on my steps. The outlet is switched on/off inside the house, but the pads also have their own in line GFCI breaker on the connecting cord. The mfg. recommends setting and breaking the breaker before each use. These are low amps <10, but could be run for hours at a time, unattended. I've scheduled an electrician to add more outdoor outlets so I can extend the pads without extension cords. Point is, whatever device you're looking at, it may have some extra safety already added.
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