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Visi-therm heaters

According to www.aquariumsystems.com the visi-therm heater is "completely
waterproof and totally submersible". Although not 100% positive, I believe
they are the manufacturer for these heaters. I have them in 4 of my tanks
and have had no problems at all. Of course, to be on the safe side I
disconnect the power to all electrical devices prior to sticking my hands
into any of the tanks.