Keep your betta happy, healthy and swimming in comfort with the Marina Betta Submersible Aquarium Heater. This 8-watt, submersible heater helps create the ideal water conditions for your betta to thrive in bowls and tanks up to 1.5 gallons. It’s designed to automatically reach and maintain a set temperature, which means you don’t need to make any manual adjustments. The exterior of the heater is made of durable polymer, so it’s more resilient than traditional glass sleeve heaters, and the red indicator light illuminates to let you know the heater is working. For your convenience, the included suction cup allows you to easily install it inside your aquarium.
8-watt, submersible heater helps create the ideal water conditions in bowls or tanks up to 1.5 gallons.
Designed to automatically reach and maintain a set temperature–no manual adjustments needed.
It’s made of durable polymer, so it’s more resilient than traditional glass sleeve heaters.
Red indicator light illuminates to let you know the heater is working.
The included suction cup allows you to easily install it inside your aquarium.
Our beta likes this heater and often swims around it repeatedly in his tank, which is just a bit larger than a gallon. It does not regulate temperature as advertised, however. We have come home to temps as high as 89 degrees and must plug and unplug this heater multiple times a day to regulate temperature. There must be a better way!
Nice and Cozy
on May 21, 2019
I got a betta for my office. Being its in an older building and they don't keep the temp consistent. I could tell his water was getting colder than it should be. so I opted for an heater. I plugged it in and pop it in his tank and he loves it. He is always making his bubble nests and swimming around and being very social. Mr Blue is very happy fishy now.
86 Degrees in 3 Tanks
on May 3, 2019
Bought 3. Just checked my tanks and they're all at 86'!!! This could have cooked my fish. I'm glad I took it out after the first day or two. Avoid this and invest in something with a quality digital thermostat. My fish are worth much better!
on Feb 27, 2019
This heater is the perfect size for my 1.3 gal tank and fits neatly in the corner. Before purchasing the heater, I was taking out a quarter of the water and adding in new warm water everyday to keep my betta comfy. Now he is very happy and more energetic than ever! Very happy with purchase!
Good heater but lacks thermostat control
on Feb 8, 2019
Heater works well but because it sometimes gets too hot for a small aquarium, it needs a timer to control the temperature. I set the timer so that heater is on for a few hours and then off for an hour so I can keep water between 76 and 78 degrees.
Saved Them From The Cold
on Feb 18, 2019
I bought these in early November right when it was getting cold in Ohio and had (and still have them) in the tank. The water didn't even change the temperature in a polar vortex. Highly Recommend.
Temporary not lasting
on Feb 11, 2019
This worked well until it started losing warmth and eventually it stopped emitting heat after three months. I went to my local pet store and got a submersible undertank heater instead, better lasting.
Saved my Beta
on Dec 28, 2018
We live in the Northeast and our home can get cold overnight.. our beta was slipping into what we described as a cold coma... he wasn't eating, losing weight and barely moving. As a last ditch effort I bough this and it brought my little fishy friend back from the brink. He's swimming and eating again. I find he cuddled up next tp the heat when the house is cool..
Got too hot
on Dec 3, 2018
The heater itself definitely works in heating the water, unlike some other heaters. However it definitely does not maintain temperature as it advertises. I checked the temperature at 86 degrees which is too high for bettas. That would essentially cook them slowly.
I gave 3 stars because it would work fine with a timer if you were determined enough to figure out the right balance and purchase a timer. However, the product advertises that it maintains temperature on its own, and it does not.
Also the suction cup didn't work well for me. I agree with others that two suction cups may have been better.
Small heater for beta
on Apr 4, 2019
This fit perfect in tank.keeps my beta nice and cozy.Cuts off automatically when reached temp.