I use ebo heaters, but I try not to submerse them. The thermostat dial moves on the outside, and of course moves something on the inside; so in my mind that tells me water COULD get inside somehow.
When possible I don't submerge them, like in my main setup. But I have stock tank full of rock, and the heater is somewhere in the bottom 
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28g Nano Cube drilled with 13g sump in stock stand. Vertex IN80 Skimmer, Phosban 150 Reactor, Apex Controller, DIY LED with stock hood, dimmable
Established March 2006
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