I had an eheim stop working on me and another that leaked stray voltage. I still have one (the third) but for mixing water. For my new tank I got a Finnex titanium heater. I bought the one without the controller since I'm using my Apex to control it. You'd need a controller, either Ranco or Apex/Reefkeeper, to make it work for you without cooking the livestock but it seems rock solid and works very fast.