I think those warnings are just to cover their a**es because they know that 99.9% of people who buy them will plug them in to a power bar, or some sort of extension cord. I mean really, who has enough wall sockets to run an entire aquarium, and how else can you use this thing with a controller? That way, if your house burns down, even if it was 100% the heater's fault, they're pretty much un-suable because they'll be able to claim you weren't following their safety instructions.
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