Had the heaters on fluval 405s and six moths later the impeller housing wouldn't stay closed.That was the weak link on those filters so its hard to say if they played a role but its suspicious that they both failed within a week or two. I replaced the filters with a fx5 and since it has 1" hoses I quite using the heaters so I don't know about longevity bt I was happy with them for the 6 months I used them. Lots of members oove the ranco controllers.