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engine block heater trips gfi

58K views 43 replies 19 participants last post by  Semi-Ret Electrician 
I installed an outside GFI for a block heater a couple years back. Months after, our office person called me and asked why I put a GFI in for the block heater. I said, well, because it's required to be a GFI. She told me that I had to go back and change it out to a regular receptacle because most block heaters will trip a GFI. She also told me that an inspector told them it was OK.

I told her to have someone else do it. She did. Not for this reason in particular, but I do not work there anymore.
 
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