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Tetra HT Submersible Aquarium Heater

by Tetra
4 out of 5 stars 701 customer reviews
| 40 answered questions

List Price: $19.99
Price: $9.99 & FREE Shipping on orders over $35. Details
You Save: $10.00 (50%)
In Stock.
Ships from and sold by Amazon.com. Gift-wrap available.
50-watt
  • No adjustment required
  • Easy to conceal
  • Two year warranty
  • Please read all label information on delivery
29 new from $8.48 3 used from $5.19

Tetra Color Fusion Aquarium
$9.99 & FREE Shipping on orders over $35. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

  • Tetra 26447 Submersible Aquarium Heater, 50-Watt
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Total price: $16.97
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Size: 50-watt
  • Buy Used and Save: Buy a Used "Tetra 26447 Submersible Aquarium Heater, 50-Watt" and save 74% off the $19.99 list price. Buy with confidence as the condition of this item and its timely delivery are guaranteed under the "Amazon A-to-z Guarantee". See all Used offers.

Product Description

Size: 50-watt

This Tetra submersible 50-watt heater is very easy to use for aquariums ranging from 2 to 10-gallons. The electronic thermostat automatically adjusts heat output to keep the water at a constant 78 degrees Fahrenheit. All you have to do is put it in the aquarium and plug it in.

Product Details

Size: 50-watt
  • Product Dimensions: 5.2 x 1.6 x 3.5 inches ; 2 pounds
  • Shipping Weight: 8.8 ounces (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • ASIN: B000OQO69Q
  • Item model number: 26447
  • Average Customer Review: 4.0 out of 5 stars  See all reviews (701 customer reviews)
  • Amazon Best Sellers Rank: #370 in Pet Supplies (See Top 100 in Pet Supplies)

Customer Reviews

Top Customer Reviews

Size: 50-watt Verified Purchase
Many people that are rating this product with a 1 or 2 star clearly are not using it right, saying it is going out or not heating hot enough. To use this heater properly, you must sit the heater in the aquarium water for 30 minutes before even plugging it in. This is to set the thermostat inside the heater. Also, you must place the heater set up 90 degrees or laying flat parallel with the bottom of the tank. Another reason it may stop working is, once you turn off the heater you must leave it in the water for 15 minutes before taking it out.

Bottom line is, this is a great heater. I use 3 of them total, one for a 10 gallon saltwater nano reef, one for a 10 gallon freshwater aquarium, and one to heat up my water change water. This is one of the best compact heaters I have used, compared to two other more expensive heaters. This is also definitely the cheapest place to find the heater (on amazon), in my local fish stores it runs $17. Ignore the reviews by people that probably didn't even read the instructions before sticking it in their tank and saying it doesn't work right. No adjustments need to be made with this heater and that is one of the greatest things about it also.

Pros:
Red light when heating
Green light when temperature is correct
Small and compact
Cheap price
Good quality
Fully Submersible
Heats up to 10 gallons
Consistent temperature
Rubber protects the glass heating tube

Cons:
Cannot change the temperature if desired.
9 Comments 132 of 145 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Size: 50-watt
I wish I could give this product a worse score than 1 star. Purchased this heater from Wal-mart in a pinch because the heater that came with the aquarium broke (was a very cheap one) and I didn't want the temperature to drop since it was winter. Kept an eye on the thing for the first few weeks of having it and everything seemed to be ok. This week the dumb thing short circuited because it got water inside somehow and continually heated the tank. I discovered this when I got home from work. I noticed unusual behavior in a frog I had in the aquarium. On further inspection my other frog was already dead on the bottom of the tank and the water was almost 100 degrees F. The frog that was still alive was just floating in the current from the filter and had a bad fungal infection that had sprouted up overnight. Removed him to a treatment tank and did what we could but the poor guy didn't make it. This is a horrible product. I would not recommend this to anyone and I wish I hadn't bought the product because I lost 2 very dear pets.
18 Comments 138 of 156 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Size: 50-watt Verified Purchase
DANGER - While this worked great for a while (from about Aug 2014 through Jan 2015), it can fail in a catastrophic way that results in continuous heating. I've attached a photo of the sad scene I found one morning... the heater thermostat apparently failed and the water temps in the tank reached 102ºF overnight.

I suspect you'll have the same risks with ANY heater—especially inexpensive ones. Best protection is to have a thermometer with an alarm, such as the "General Tools AQ150 Digital Aquarium Thermometer" amazon.com/gp/product/B00M9T7ZF8

While it worked, this heater did function as advertised. I've since replaced it with a different model—plus the temperature alarm referenced above. The fish has also been replaced, but it was a preventable, sad morning!
1 Comment 33 of 34 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Size: 50-watt
I have purchased 3 of these Tetra Heaters in the past 5 months, and all of them have quit. The warranty only allows you to pay shipping both ways, either to fix yours, or they will send another one. I do not want any more of these Tetra heaters, and am looking for another brand. I wouldn't waist your money.
7 Comments 64 of 72 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Size: 50-watt
I owned this product for about two years. I thought it was really great. Kept my betta and pleco nice and toasty, until a week ago when it shorted and cooked both of my fish. I was extremely upset and will NEVER be buying this product EVER again. Sure, send it back and get a new one, but the fish are already medium-rare.
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Size: 200-watt
ok so I've had this heater for 6 months and one day i was about to feed my fish...and I always tap on the glass to get them to come to the top of the tank and I saw that some of them were at the bottom, some were just swimming in the corner, and the rest just didn't come to the top...so I was like "what is wrong with these fish"? so I put my hand on the glass and it was HOT!!!! I looked at my thermometer and saw that the temperature was 98 degrees!!!! I started freaking out...so I unplugged the heater...opened the lid and set a fan to blow on it...I got some plastic bags and filled them with ice and floated them on the top to bring down the temperature...I was doing everything I could think of...this was all at 1 a.m. in the morning btw...so I went to sleep worried about these fish...in the morning the temperature had gone down to normal...and I lost 2 fish...i was really upset...but then i realized i had to buy another heater because if I left it without one the fish would get too cold and die...so I had to go to the store and buy another the next day...anyway, the moral of the story is if you have the money to buy a better heater, please do...because if I hadn't have caught it early i would have lost every single fish...so just spend the extra 10 or 20 bucks...hope this review helps...
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Tetra 26447 Submersible Aquarium Heater, 50-Watt
This item: Tetra 26447 Submersible Aquarium Heater, 50-Watt
Price: $9.99
Ships from and sold by Amazon.com