I had the identical problem with the heater element in my trailer several years ago. GFI house breaker would trip every time. Turned off water heater circuit breaker and still had the problem. When I disconnected the neutral feed from the heater element the GFI breaker stopped tripping. The heater circuit was indeed energized from the neutral side and the leakage current from the neutral found its way to ground and the GFI breaker detected the imbalance and tripped. 100 foot extension cord may have aggravated the imbalance?
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2008 Springdale 266RELL
2007 Silverado 2500HD crew cab short bed
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