Tetra HT10 Submersible Aquarium Heater & Electronic Thermostat, 50-watt

By Tetra
Rated 3.3469 out of 5 stars
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$11.99Chewy Price
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Rated 3.3469 out of 5 stars
$11.99Chewy Price

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About This Item

  • Submersible heater that can be installed vertically or horizontally.
  • Low voltage thermostat maintains water at 78°F.
  • Features red/green indicator lights to show when the heater is heating or on standby.
  • For use with 2-10-gallon aquariums.
  • Easy to conceal behind plants or other décor.

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Fish TypeN/AN/A, Marine Invertebrate, Tropical Freshwater...N/ATropical Freshwater, Betta, Cichlid, Goldfish, Marine FishTropical Freshwater
Aquarium TypeFreshwater, SaltwaterFreshwaterFreshwater, SaltwaterFreshwater, SaltwaterFreshwater
Capacity (Max)N/AN/AN/AN/AN/A

Questions & Answers

8 Customer Questions

Once water is up to temp and light is green, do I need to unplug the heater?
Answer by ChewyNov 17, 2020
Once the water is up to temperature, it does not need to be unplugged as the heater will maintain the water at 78°F.

Does thermostat stay red or later green
Answer by ChewyApr 05, 2020
The indicator light lets you know when the water is being heated (red light) and when it is at the proper temperature (green light).

Does this run on power cord
Answer by ChewyDec 11, 2019
This item uses a power cord.

Can this be used in a plastic tank?
Answer by ChewyNov 12, 2021
This thermostat can be used in a plastic tank as long as the tank is the proper size for it, it is fully submerged at all times, vertical and not touching the gravel or décor.

ReviewsWrite a Review

Rated 3.3469 out of 5 stars
49 Reviews
Would recommend to a friend

49 Customer Reviews

Rated 4 out of 5 stars
By Ivie on Feb 27, 2022

Pretty good

I have this in a 5 gallon tank and it seems to be working so far. I've only had it in there for a couple days but it has warmed the water up to be around 76° F. It's not adjustable so if you need warmer water than that I'd look elsewhere. It works for my purposes though, my tank is in a cold basement so the water was like 60° F before, all I needed was to keep the water a little warmer for my betta and it seems to be doing that job so far.

Rated 2 out of 5 stars
By Beth on Apr 7, 2022

Not for tropical fish

With my apartment at 70 degrees, this heater keeps the water in my 10 gallon tank around 60 degrees. Not quite warm enough for tropical freshwater fish.

Rated 1 out of 5 stars
By TomF on Mar 3, 2022

Sad by results

I was disappointed with the Tetra heaters that i recently purchased. They said that they would automatically adjust the water to 78°. One maxed out at 74° and the other at 76°.

Rated 3 out of 5 stars
By Starr on Dec 20, 2021

This things alright.

It’s alright for a small tank that the water doesn’t matter is it fluctuates a little bit between 70-78 sometimes the thing kicks off for a bit and will start back up. Which for my case is perfectly fine.

Rated 5 out of 5 stars
By Logan on Dec 10, 2021

Work really well actually

The people who don’t think it works well are the people who are expecting the water to be hot. It keeps the water just the right temperature and even works for tanks bigger than the recommended size. Absolutely love it

Rated 5 out of 5 stars
By Maya on Oct 16, 2021


The heater is amazing. I recently got a quarantine tank for my betta fish. I was looking for a heater and found this one not only is it soooo affordable it’s great quality too. I’m VERY happy with this product. It takes abt 24 hours or more for it to fully heat the tank:)

Rated 5 out of 5 stars
By Bettafishlover500 on Nov 28, 2021

it works well but

The heater works fine but I don’t like how there’s only one suction cup it makes it harder to keep it up straight but otherwise I love the heater.

Rated 1 out of 5 stars
By Heater on Sep 28, 2021

Did not work at all

I bought this and it doesn’t even heat up at all. It’s like it’s completely broke. This is why I don’t like buying online, it s to much of a hassle to return item.

Rated 1 out of 5 stars
By ratmom on Jul 21, 2021

Saving your money

Tetra 50 watt heater. Absolutely does not work I have 50 watt in my 5 gallon tank absolutely and I have freezing water the red and green light absolutely do nothing the only time you see it is if you plug it in or unplug but if you blink you'll miss it have they commented as of why the light doesn't stay on to tell us it's heating? And you can touch that thing while it's in the water and it's cold as ice

Rated 4 out of 5 stars
By Huffnpuff on Dec 27, 2021

Heater with no adjustment

Great little heater, just wish I could adjust the settings.