Tank heaters revisited

[my2rotties]

My heaters do not like they are sealed enough on the top to chance submersing them. I got bugged at the LFS but still insisted they should not be submersed since they said not to do so... Electricity in water just seems like a real bad idea if it says not to submerse. The last thing the previous home owners said was not to submerse the heaters and he lost a tank full of fish when he did so once by accident.

That would be a show stopper if anything...