Aqueon Mini Aquarium Heater, 2-gal, 5 watt

I've bought several of these for my 1.5 to 3 gallon tanks for my betta fish & they are working well! As other reviewers have mentioned, the only concern I have is the heater not having an indication light to tell you it's working & no way to manually adjust how much heat it is putting off. But, hey, for the price I paid it does very good!

I bought this from a chain store in April before I found out about Chewy, so I overpaid. :( I am still thrilled with the product! I'm using in a 2.5 gallon quarantine tank, where I also breed amphopods. The ambient temp stays 68° - 72°, and the tank stays a consistent 80° - 84° F, so a bit warm for most tropicals...and significantly warmer than the "ambient temperature + 6°" that was advertised. After reading the reviews, I am going to invest in a similar inline temperature control system I use to use with my ball pythons, it sounds like some devices don't properly self regulate. For a quarantine/hospital tank it has been perfect. Able to treat ick in guppies quickly due to elevated temperatures I bought this from a chain store in April before I found out about Chewy, so I overpaid. :( I am still thrilled with the product! I'm using in a 2.5 gallon quarantine tank, where I also breed amphopods. The ambient temp stays 68° - 72°, and the tank stays a consistent 80° - 84° F, so a bit warm for most tropicals...and significantly warmer than the "ambient temperature + 6°" that was advertised. After reading the reviews, I am going to invest in a similar inline temperature control system I use to use with my ball pythons, it sounds like some devices don't properly self regulate. For a quarantine/hospital tank it has been perfect. Able to treat ick in guppies quickly due to elevated temperatures, and quickly identify any health issues in newly store bought fish. 4 star due to inability to control temperature via the device. Definitely needs to be closely monitored for temperature ranges. Otherwise it's a great little heater. … more

Works some of the time but water is cold and doesn’t keep my fish warm

Within 24 hours it had my tank within normal range. My betta loves her warm 2 gallon tank.

Had it for over a year now. Temperature stays steady at 80 in a 2.5 gallon. Never had any issues. Amazing value

Doesn’t heat up whatsoever my turtle is still in cold water i wasted my money for no reason

In about 8 hours the heater raised the temperature to 76 degrees from 70. So far that’s the temperature it has stayed at. We’ve been using it for 3 days now and my betta seems to be swimming even more (we’ve only had him less than a week). Most of the time he likes to lay on top of the heater

Had this in a maternity tank. According to description, temp should only get a few degrees above room temp, but that is not the case. Had it on for about 24 hours. Water temp reached almost 90 in A 2.5 gallon. Needless to say, all fry are dead. Mother barely alive. CHECK YOUR TEMPERATURE REGULARLY. IT DOES NOT SHUT OFF AT A PRESET TEMPERATURE.

The size of this heater is perfect for smaller size tanks. Sticks on super easy and you don’t have to worry about it coming off anymore. I have realized the temp fluctuates a good bit but it doesn’t seem to get too low. Haven’t seen it get to high yet but def keeping an eye out for now. All together nice heater for cheap and fast delivery. Really can’t go wrong with chewy

I have mine in a 2.2 gallon, and at first I was worried due to the mixed reviews I’d seen. I had heard that it either made the tank roasting hot, or didn’t even turn on at all. But it seemed like the cheapest option if it did end up working, so I bought it to see. It took a bit to warm up, but now it keeps my sponge-filtered tank in the high 70s, perfect for my betta. It isn’t preset so the temperature fluctuates a bit, but it always keeps my tank in the “green zone” on my thermometer. And usually on the warmer end of it as well, which my betta loves. Would definitely recommend for a beginner looking for a quick, easy-to-install heater for their betta or other tropical fish. Just stick it on I have mine in a 2.2 gallon, and at first I was worried due to the mixed reviews I’d seen. I had heard that it either made the tank roasting hot, or didn’t even turn on at all. But it seemed like the cheapest option if it did end up working, so I bought it to see. It took a bit to warm up, but now it keeps my sponge-filtered tank in the high 70s, perfect for my betta. It isn’t preset so the temperature fluctuates a bit, but it always keeps my tank in the “green zone” on my thermometer. And usually on the warmer end of it as well, which my betta loves. Would definitely recommend for a beginner looking for a quick, easy-to-install heater for their betta or other tropical fish. Just stick it on the tank wall with it’s suction cup, and plug that bad boy in. Super easy. … more