@Brew12 thanks for your reply and I know we’ve replaced some of our GFCIs but perhaps not the ones in question.It sounds like you have pre 2014 GFCI's in your house. Newer GFCI's shouldn't have an issue with inductive loads any longer. They have been greatly improved.
But question is still out there , is there another way to measure or detect stray voltage?
I’m guessing that unless I have an Apex or something $$$ if the GFCI trips while I’m at work or something I won’t know about it until perhaps it’s too late for the tank. It would be great if there was a device that could send a warning or something if a voltage was present.