damn, that's horrible. I just used a tetra heater for my 10 gallon tank and it's been doing fine, now I'm a bit worried lol.Personally, I'm not a fan of their heaters. I went through 3 of them in a year. Thought they would be good since everyone talks great about Eheim, but I guess that's just for their classic filters. Last straw was when one of them stayed "On" and made fish stew out of my 75g tank.