Tank heaters revisited

[my2rotties]

I NEVER submerse my tank heaters because it says right on the box not to do so. When I change my water, I unplug the heater so it does not explode when it gets wet again (did that by accident).

We were in an LFS and of course my hubby saw the heaters submersed and I got razzed for being so anal. Well tonight my hubby forgot to unplug the heater like I always do. It exploded and I am getting the "If it was submersed it never would have happened in the first place".

I just feel this is a no brainer since it says right on the box and right on the heater NOT to submerse it under water. Then there is a little picture showing how much the water level should be sitting at.

Who wins, myself or the hubby in this one?