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(More customer reviews)Have this heater now in my fish tank for about a year. The heater itself has a glass housing. The outer casing visible in the picture is plastic. That's great to avoid any fish getting burned by the heater. Target temperature adjustment is straight forward following the instructions. I strongly doubt that any fish could change the adjustment (done by the little red lever which, granted, is in the water as well) as I had read somebody else posting. I use the heater fully submerged.
One thing to be aware of is that the heater needs to be in "flowing" water when being mounted vertically. Otherwise the built in temperature sensor will get triggered and report an error (rising warm water will create and "overheat" condition which switches off the heater). I don't have much water flow in my fish tank so I decided to mount the heater horizontally an inch or two above the gravel. Works perfectly this way.
The best part of the heater is the color coded built in temperature display. As long as the water has a temperature within one or two Fahrenheit of the target temperature the display is green. If the water temperature rises the display becomes red (while of course also displaying the exact temperature as a number). If rising an additional few degrees the display blinks red. Similarly if the water temperature goes below the target range the display becomes blue. This way one can quickly check that the water has the right temperature.
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E Series LCD Heaters from Fluval are the most advanced submersible aquarium heaters on the market today. Computer-controlled precision and fish-safe design contributes more than ever to the safety of your tank's inhabitants. Dual temperature sensors, and temperature selection to the nearest 0.5 degree with an LCD display allows for precise control and accurate tank readings. Colored display alert changes color if preset temperature changes plus or minus 2 degrees Fahrenheit. Integrated fish guard keeps fish from direct heater contact and protects glass sleeve from breakage. Easy heater bracket allows heater to be moved or removed without removing it.Designed for tank or sump use. Heaters are partially submersible only and are not to be fully submersed.
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