Mark,
The ebo's do have a 'maximum' water line marking...however this is just the company covering themselves in case the heater should fail and leak current into the tank, or shock you. Ebo's are 100% submersible, and I run one in my salt tank without problems.
They are one of the higher quality heaters around...i recommend them or visi-therm for submersibles.
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Former advisor and planted tank geek...life's moved on though.
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