Submersible heaters

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Buckfins

Aquarium Advice Freak
Joined
Feb 1, 2013
Messages
303
Location
New Braunfels Tx
Are submersibles really just that? I have the temp knob just above the water line because there are actually markers on the heater showing how far it should be in the water. I have always completely submerged mine. Is that bad?
 
That line is the MINIMUM water line, to prevent someone from running it dry and having it shatter or overheat. As long as the packaging specifically stated submersible, it's fine as long as it's under water to that line.
 
I know here in Canada the submersible heaters are marked with a minimum water line for the reasons stated, but also a maximum water line due to laws that require it on electrical items that go in the water. The same heater in the US will have no maximum line usually. You may have one of these. But they can go fully underwater.
 
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