One of the things about an extension cord, it's not only the cord, it's the supply line to the outlet you plug it into. Say you need a 10 Ga wire to meet the draw for the tub. So you get a heavy duty 10 Ga extension cord and plug it in. But the receptacle it is plugged into is wired with 12 or even 14 Ga wire. The draw will be too much for the line. A receptacle specifically wired for the tub would be 10 Ga all the way from the appropriate sized breaker.
I agree that the dealer should have strongly warned you and said it would void the warranty; even refuse to plug it in. That's good customer service. However, ultimately, they give us all the product paperwork so that WE can read it and be responsible for the product.
Yeah, I don't read mine either.
Bummer.
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