Electrical Bonding - Kohler Whirlpool Tub

Hello, Pump motor and heater are both on dedicated GFI circuits of the proper voltage and amerage. Copper pipe is part of the service panel grounding electrode system. NEC 680.73/74 says that "bonding of all the tubs metal parts is required". Is this simply a matter of using the required #8 solid copper wire to attach these 3 things together? Why is there no reqiured tie in to the service panel or grounding electrode system? Thanks for helping me with a question that must have been asked many times before. D. MacQueen
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