I bought two of these heaters and they both stopped working almost at the same time. The outer plastic casing on the bottom of the heater shattered, allowing water to enter the heater. Many other people have reported the exact same issue with this heater. I contacted Aqueon about the warranty and they sent me new ones. One was an older model and the other was a newer model with LED lighting on the adjustment knob instead of the tube. market today. It's made of aluminum rather than glass, so you don't have to worry about it breaking if you leave it on for a water change or drop it. Unlike the previous Aqueon heater, it is fully submersible and features a very sleek all-black design. Unlike other heaters that only have an indicator light to show when it's heating up, the indicator on this heater is red when it's heating up and green when it's reaching the set temperature so you know it's plugged in. Some other reviewers have indicated that this heater is running low. My experience has also shown that it has dropped about 4 degrees Fahrenheit as indicated by the floating thermometer. However, it turned out that the thermometer had actually dropped 4 degrees! Using a calibrated digital cooking thermometer, I found that the heater actually held the set temperature accurately. So if you find it leaking, check your thermometer as this is the most likely leak. According to Aqueon, the internal thermometer was calibrated twice during production to ensure accuracy. The Pro Heater comes with two black suction cup clips that you can use to attach it to your aquarium. It's very safe if you use both. Using just one allows the heater to rotate so use both for a secure fit. This heater was so good I bought another one. There is a problem with the second heater; The plastic cover of the indicator light was not installed correctly and water was able to get into the heater. Revain quickly replaced the heater and it worked perfectly straight away. This Aqueon Pro heater is very accurate, works very well and is easy to use. This is more accurate than floating tank thermometers! Dimensions from the bottom to the top of the temperature scale: 50W - 9 inches 100W - 10.3 inches 150W - 13 inches 200W - 13 inches 250W - 15 inches Made in Italy. Limited lifetime warranty against defects. .EDIT - Here's a tip: the clamp and suction cups are two-piece. Make sure the open end of the clip is facing down when attaching it to the tank to prevent debris from collecting in the gaps between the clip and the suction cup.
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