Fluval Submersible Glass Aquarium Heater, 50-watt

By Fluval
Rated 3.7143 out of 5 stars
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Fluval Submersible Glass Aquarium Heater, 50-watt slide 1 of 2
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Fluval Submersible Glass Aquarium Heater, 50-watt slide 1 of 2
$19.48Chewy Price
$33.99Chewy Price

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About This Item

  • Sleek and compact submersible heater provides exceptional performance and unsurpassed reliability.
  • High-density ceramic heating element is encased in shock-resistant borosilicate glass.
  • Temperature can be set between 68 and 86 degrees F; suitable for up to 15-gallon fresh or saltwater tanks.
  • Unique reflective technology of the outer casing makes the heater virtually invisible in your tank.
  • The included dual suction cups allow you to easily install the heater inside your aquarium.

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Fish TypeTropical Freshwater, Betta, Cichlid, Goldfish, Marine FishTropical Freshwater, Marine FishTropical FreshwaterTropical FreshwaterTropical Freshwater, Betta, Cichlid, Goldfish, Marine Fish
Aquarium TypeFreshwater, SaltwaterFreshwater, SaltwaterFreshwaterFreshwaterFreshwater, Saltwater

Questions & Answers

16 Customer Questions

Cannot choose the size
Answer by mossbackApr 29, 2022
3-5 watts per gallon.

Does this shut off to maintain the desired set temperature?
Answer by ChewySep 17, 2018
The unit heats only when the pilot light is illuminated. When the pre-selected temperature is reached, the pilot light shuts off. It will light again only when the heater is required to maintain the temperature at the selected level.

Can this be used in an acrylic fish tank?
Answer by ChewyOct 08, 2018
This heater is safe to use on any tank that can withstand temperatures up to 86 degrees Fahrenheit.

Is this the heater I need for a 5 gallon tank. If not what do your recommend please
Answer by ChewyAug 12, 2020
The Fluval Submersible Glass Aquarium Heater is suitable for your tank, it is designed to work in tanks up to 15-gallon (fresh or saltwater tanks).

ReviewsWrite a Review

Rated 3.7143 out of 5 stars
28 Reviews
Would recommend to a friend

28 Customer Reviews

Rated 5 out of 5 stars
By MerleTheGirl on Apr 5, 2022

Excellent purchase

The best aquarium heater I have purchased. Extremely accurate and the appearance in the aquarium is elegant. In fact, I am purchasing another one to replace a different heater that I purchased that is NOT heating the aquarium sufficiently.

Rated 1 out of 5 stars
By FishMom on Feb 19, 2022

Too big for 5gallon

This is too tall for my tank. I have the 5 gallon Aqua Culture starter kit and it’s much too tall for my tanks water level. I’m sure it would work fine for a taller tank. Definitely going to try to return.

Rated 5 out of 5 stars
By Nano5 on Dec 20, 2021

Great Heater

Pretty nice heater. I was sceptical about the glass cover but it does look nicer I think than plain black. The picture does not do it justice. I have it in a 5 gallon nano so no, it does not fit in the filter area if you keep the sponge. But it is fully submersible so you can put it like mine in the tank. The downsize is it is visible, the upside is it has no issue at all keeping temp. The smaller size ones might

Rated 3 out of 5 stars
By talm on Feb 3, 2022

very noticable

This heater works OK. I have the white Edge tank so the silver and black on this heater make it very noticable, and due to it's large size, it's hard to hide. The best way to hide something is to make it blend in. This does not.

Rated 5 out of 5 stars
By Brendaboo on Jan 18, 2022


I have a 6 gallon tank at my office that I got a preset heater for. My beta on the weekends when I wasn’t there the tank would get slight chilly for a betas liking. This one is preset to 80 and he is warm even on the weekends!

Rated 5 out of 5 stars
By Bill on Oct 21, 2021

Fluval heater

Very satisfied. Heaters can be hit or miss but this one is working, Only 3 weeks, like it should. I am hoping this one lasts for years like the other Fluval heaters I own.

Rated 1 out of 5 stars
By Samantha on Nov 7, 2021

Fluval Heater

I bought this for my beta tank, I set it up and everything and it doesn’t work. I don’t even think it heated up at all

Rated 3 out of 5 stars
By Candel on Sep 6, 2021

What’s to big for my tank

Was to big for my tank trying to send the water heater back but the box came with no return label. Unnecessary frustration !!!!!

Rated 5 out of 5 stars
By LisainNM on Mar 15, 2021

Great little tank heater

I have 3 bettas and was using the tetra brand heaters which work fine. However one of my betta tanks sit in our sunroom and in the winter at night that room is the coldest in the house and the tetra brand heater could not keep the tank up to temp. When I would wake up the tank temp would be 74 degrees and with a +/- 1 variation I was not happy with the temp being at the low end of acceptable temps. So I decided to give this little heater a try and I am glad I did! I set this heater on 80 and the tank has been 79 degrees ever since. With a +/- of 1 on the tank thermometer (I have digital probes in tank) this is acceptable and I am very happy with this purchase! I just ordered 2 more to have on hand to replace the other 2 when needed.

Rated 5 out of 5 stars
By Honey on Jan 17, 2021

Fish tank heater

This is probably my favorite addition to my tank. Its modern its elegant and highly accommodating with multiple ways to position. Its a little confusing at first and does take a day or so to sufficiently do its job in my 3 gallon tank. It lights up a soft blue in the middle when it feels a temperature change in the water and fine print states it has a 3 year warranty. Im in love with this product and so far has been worth every penny. My betta seems to like it too since I caught him hanging around it a few times.