FLUVAL Submersible Glass Aquarium Heater, 50-watt - Chewy.com

Fluval Submersible Glass Aquarium Heater, 50-watt

By Fluval
Rated 3.6452 out of 5 stars

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$18.04Chewy Price
$34.99Chewy 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 Freshwater, Betta, Cichlid, Goldfish, Marine FishTropical FreshwaterTropical Freshwater
Aquarium TypeFreshwater, SaltwaterFreshwater, SaltwaterFreshwater, SaltwaterFreshwaterFreshwater

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.

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).

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.

ReviewsWrite a Review

Rated 3.6452 out of 5 stars
31 Reviews
Would recommend to a friend

31 Customer Reviews

Filter by reviews that mention

Rated 1 out of 5 stars
By AmyM72 on Jul 23, 2022

So disappointing

I bought this heater for my 29 gallon setup. It had been recommended to me by several people, so I splurged on it. So disappointing! I'd keep turning the temp up and my tank never went above 72. I even adjusted the dial as high as it would go and the temp stayed at 75. Don't waste your money on this heater!

Rated 5 out of 5 stars
By ChihuahuaLover on Dec 11, 2022

Great Value

Works as described. I am buying another for my second aquarium.

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 3 out of 5 stars
By ehhnot on May 29, 2022

stopped working

ive had this for two months now and it just up and stopped working on me. could i get a recommendation on a new one?

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