It's hard to find a reliable heater. For the most part, these are pretty dependable as I have 6 of them. One has stopped working totally and another flaked out on me one time raising my tank temperature to 90 degrees before I caught it. Luckily my engineer goby didn't cook. That heater hasn't acted up since, but I put it in a 220g in the basement with a room temp of 68 degrees. Would have never thought a 200w would keep 260+ gallons 9 degrees above ambient.

I’ve had this heater for 5 years now and it just went defective...but for 5 years that is quite a long time that it was successful and for that reason I just replaced the defective one for the same exact one. Boy does 5 years go by fast.

Unfortunately, I have a ton of these and at least a half dozen won't turn off. I've resorted to using them only when they are undersized and unplug in the summer - otherwise I would cook my fish.

The light on front is very easy to tell that the heater is working properly. Keeps water temperature right where you set it.

I have two of these in my 75 gal Sump. They do the job very quickly and are built very well. Great Buy

I chose it because it has a lot of positive reviews here and elsewhere. I also chose it because it has an adjustable thermostat - that's vital when you are starting up a new tank - higher to get the bacteria going and then lower once it's cycled and you are ready for your aqua babies. I have been using my first one for a few weeks and it holds the temp stable and steady. It also fits nicely down in a Fluval Spec V (where there isn't a lot of room to put your heater but it *does* fit right on top of the pump!). I wanted a reliable heater and I do believe I found it. I was so pleased with it that I bought a second one. If anything changes, I will update, but I really feel confident that I chose the best heater possible in an affordable price range.

The Aqueon Pro heaters have become my favorites. They're very good, though not perfect. They hold an even temperature, but the setting knob is not calibrated well. To get 75 degrees in one tank, I had to set it to 80. In another, to 70. But, once set, they do hold steady, without noticeable temperature fluctuations. They blend in with a black background, which is great, except for the bright blue knob. What is that about? And with a plastic housing, I'm much less worried about cracking it.

Long time fish owner. I have had many heaters. From box store shelves. All were glass submersible. Nothing lasted. I went without heat for years. Fish lost there color and became lazy. This year I decided to work harder on my tanks, added fish and I knew I needed heat again. Almost two months now and it's still perfect temp. I have about an eight degree differnce I needed, so I set it for four degree differnce the first night, then a few days later I turn the lever up a few more degrees, and have no touched it since.