I swear... I am going to worry myself to death soon! Uuugh...
I have only ever used heaters that aren't completely submersible. That's just all I've ever had and I trust them in their sturdiness.
BUT now, I may be getting a submersible one, and a I need a little reassurance

I am scared of something going wrong with the wiring or something coming loose whilst underwater and... zzzaaap.
How confident are you about submersibles?
Anything bad ever happen?
What type of heater do you prefer?
Again, thanks for putting up with me