Any electricians out there re. GFCI?

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fhk

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As I am gathering equipment for my electric brew kettle I have bought some 4000 watt voltage controls to vary my current to the elements. What I would like to do is install these upstream of the GFCI receptacles. I am concerned that varying the voltage will cause the GFCI to trip. Would it matter to the GFCI if voltage was varied either before or after the device?
 
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