Question On Heater

[micaiah12]

Hey, I have this heater. It says submersible, but then it says max water line at the top. What do I do?
Submerse or keep it where it its?

Fluval Submersible Glass Aquarium Heaters - Heaters & Accessories - Fish - PetSmart

 

[miran3773]

Add it until the max line then remove it just slightly, it also should have a min line, just remember to turn it off for.water.changes

 

[micaiah12]

yeah I turn it off before PWC. Thanks!

 

[Scouser]

It has a diagram on the package -_-