Customer Reviews

Rating: 4.2 of 5 stars 44 Reviews 44 Reviews 4.2 out of 5 Stars

84% Recommend

84% of reviewersrecommend this product

Rating: 4.2 of 5 stars 4.2 / 5

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Marina Betta Submersible Aquarium Heater

Marina Betta Submersible Aquarium Heater

  • Most Helpful Positive Review

    Read All 34 Positive Reviews

    Betta Heaters

    By BriM on Feb 1, 2020

    Bought these on a whim and very pleased with them. I have temporary small tanks set up for quarantine of a few new betta and they maintain the temperature during the winter very well. Both tanks have thermometers to keep a check on temp. The only negative thing about these is that there is no set temp Bought these on a whim and very pleased with them. I have temporary small tanks set up for quarantine of a few new betta and they maintain the temperature during the winter very well. Both tanks have thermometers to keep a check on temp. The only negative thing about these is that there is no set temp on them. Thou there is a red light to know that it is on. … more

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  • Most Helpful Critical Review

    Read All 10 Critical Reviews

    doesn’t work

    By mjww on Mar 17, 2020

    I put this heater in my betta’s .5 gallon tank (it was at 78°). I woke up the next morning and the temperature was at 60°.

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4 Reviews

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  • 1 out of 5 stars

    doesn’t work

    By on

    I put this heater in my betta’s .5 gallon tank (it was at 78°). I woke up the next morning and the temperature was at 60°.

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  • 1 out of 5 stars

    86 Degrees in 3 Tanks

    By on

    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!

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  • 1 out of 5 stars

    Stopped working

    By on

    I have been using this in a 2 gallon betta hospital tank for 2 months. Initially worked well. Completely stopped working 2 weeks ago. The light comes on but it does not heat at all.

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  • 1 out of 5 stars

    THIS THING IS GARBAGE

    By on

    YOU SEE, I just wanted my fish to be warmMm! It’s a bit chilly here, his tanks by a window. It can’t go any where else. So the nice fish owner I am, I bought this contraption. And IT SUCKS. HE IS STILL COLD HIS TANK IS STILL FREEZING.

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