I had a helix RHP installed in my cage that i keep at 60% humidity plugged into a regular outlet without issue...HOWEVER that doesnt mean it was correct...if the instructions say to use a GFI then i would just to cover your bases. If you need to get it going tonight you could run to home depot or something similar and buy an outlet that has the "test/reset" buttons and just swap the outlets out. These act just lile gfi breakers but you dont have to mess with your breaker panel
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