About a year and half ago I bought a tank off CL that came with a Marineland stealth heater. I have always used jager heaters. I have one I bought used in 1992 that I still use today. It's a green one that takes a coin to change the temp, for those that remember. Anyway I did some research on that Marineland heater and found they were recalled so I took it back to petsmart. Since they don't have eheim jager heaters I traded it in for a 200 Watt Aqueon and installed it on my 110 gallon fresh water tank. Today I was doing maintenance and the water felt warm, after checking it was 86 and the heater was stuck on. I intentionally put it on my fresh water tank as it was minimal size for that tank and would have the least to lose. All my have salt water tanks multiple small heaters and controllers for triple back up but not my fresh water. I'm glad I didn't lose any live stock. I just put my 300 Watt jager that I use for heating water for water changes in that tank and ordered a new 200watt jager ($24.50 with free shipping) . I honestly think heaters are one, if not #1, of the most likely things to fail in any tank. Just thought I share my luck with Aqueon, I Should of traded old heater for dog food.