Review on Finnex Digital Quartz Glass Heater Fish & Aquatic Pets ~ Aquarium Heaters & Chillers by Chelsea Young

I also use it in a 75G aquarium when I drive. I initially had placement issues - no matter where I placed the heater and sensor, the heater stopped with an EE error after about 90 seconds. I think the problem was that the end of the heater was slightly above the waterline. Full immersion fixed it. It would be nice if the packaging or instructions specifically stated that the heater is fully submersible, as it can be dangerous to get confused here. Now the heater works beautifully and I love the digital temperature display and separate controller.