Marina Betta Submersible Aquarium Heater

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$12.98 (-28%) Chewy Price
$17.99 List Price
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About This Item

Details

  • 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.

Instructions

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Questions & Answers

12 Customer Questions

The red indicator light stays on all the time?

Answer by Chewy • Apr 06, 2024
The red indicator light illuminates to let you know the heater is working and will remain on when the heater is in use.

Is the Heater Perfect To Heat Up A Small Bowl For A Baby Betta.

Answer by Chewy • Oct 25, 2018
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.

is it fully submersible?

Answer by Chewy • Nov 22, 2018
The Marina Betta Submersible Aquarium Heater is fully submersible.

How long does it take to heat up?

Answer by Chewy • May 17, 2019
There are many variables to consider such as tank size, initial water temperature, etc. A specific time frame is not available, however, it should be sufficiently heating the water in the first couple of hours.
Reviews
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3.9
Rated 3.9 out of 5 stars
70 Ratings
Terms & Conditions

66 Customer Reviews

Rated 4 out of 5 stars
By Jennifer on Dec 1, 2025

Warm

We bought this for my betta for his 1 gallon tank but it got to hot and theres no way to turn it down. We got him a 2 gal yank and it works a little better. Hut

We bought this for my betta for his 1 gallon tank but it got to hot and theres no way to turn it down. We got him a 2 gal yank and it works a little better. Hut still wish it had a temp setting

Rated 1 out of 5 stars
By Lorelei on Nov 17, 2025

too large for tiny beta tank

this heater has brought my beta tank above 80 degrees, having it in with my Sapphire makes me uneasy, I do not want to cook my friend

this heater has brought my beta tank above 80 degrees, having it in with my Sapphire makes me uneasy, I do not want to cook my friend

Rated 1 out of 5 stars
By Tracey on Jul 30, 2025

Too hot

I have a 1-gal tank. The instructions say this heater will reach 80 degrees in a 1-gal tank. I unplugged at 84 degrees (with the tank light off).

I have a 1-gal tank. The instructions say this heater will reach 80 degrees in a 1-gal tank. I unplugged at 84 degrees (with the tank light off).

Rated 4 out of 5 stars
By Twilight on May 12, 2025

Marina Betta Submersible Heater

I just set up my tank a few days ago. It seems to be keeping my Marina Ez Care 1.3 gallon tank between 80-83. My room temperature is around 80 currently. The suction

I just set up my tank a few days ago. It seems to be keeping my Marina Ez Care 1.3 gallon tank between 80-83. My room temperature is around 80 currently. The suction cup keeps falling off the back of the tank overnight. So far that's my only issue with it.

Rated 3 out of 5 stars
By susan on Jan 14, 2025

For tanks / bowls up to 1 pound

I use this for my betta 1 pound temp bowl. He's been alive for 2 days in it. Heat is inconsistent-use thermometer on side to guage temp.

I use this for my betta 1 pound temp bowl. He's been alive for 2 days in it. Heat is inconsistent-use thermometer on side to guage temp.

Rated 5 out of 5 stars
By Stacy on Nov 14, 2023

Happy Heater

Buddy my beta fish is in love with this heater. In the mornings he is cuddled up to it. This heater has made Buddy very happy!

Buddy my beta fish is in love with this heater. In the mornings he is cuddled up to it. This heater has made Buddy very happy!

Rated 4 out of 5 stars
By Angie on Dec 14, 2022

It Works too Well!

It works but it does get hotter than what it said it would do. Hopefully fish will not die! Temp varies but wondering if that has to do with house temp. too?

It works but it does get hotter than what it said it would do. Hopefully fish will not die! Temp varies but wondering if that has to do with house temp. too?

Rated 5 out of 5 stars
By jmpi on Sep 30, 2022

Works well

We have only had this a couple weeks but it is doing exactly what it is supposed to do Our small glass aquarium is staying at about seventy eight degrees and our

We have only had this a couple weeks but it is doing exactly what it is supposed to do Our small glass aquarium is staying at about seventy eight degrees and our betta loves it

Rated 1 out of 5 stars
By poor on Jan 24, 2022

ok at first then got too hot

It worked for a couple weeks just fine for our 1 gallon tank keeping it at around 76 degrees but all the sudden the temperature has jumped up to 84. I am lucky my

It worked for a couple weeks just fine for our 1 gallon tank keeping it at around 76 degrees but all the sudden the temperature has jumped up to 84. I am lucky my fish is still alive but this was disappointing.

Rated 1 out of 5 stars
By Krisblack on Sep 9, 2021

Ordered a fish tank heater got a invisible pet collar

Well i'd love to review the heater i ordered but i got a pet safe collar for outside paly instead... not sure how this happened but now my beta fish is still cold

Well i'd love to review the heater i ordered but i got a pet safe collar for outside paly instead... not sure how this happened but now my beta fish is still cold but he can go outside safely...