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Tetra HT Submersible Aquarium Heater

4.1 out of 5 stars 885 customer reviews
| 66 answered questions

List Price: $19.99
Price: $9.99 & FREE Shipping on orders over $49. Details
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50-watt
  • All Tetra HT heaters have indicator lights to let you know when the heater is on
  • Once a month, unplug the heater, let it cool down, and remove it for cleaning
  • The HT10 maintains water between 76 degrees F and 80 degrees F
  • Easy to use and setup
  • Please read all label information upon delivery
36 new from $5.48 1 used from $8.00

Tetra Color Fusion Aquarium
$9.99 & FREE Shipping on orders over $49. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

  • Tetra 26447 Submersible Aquarium Heater, 50-Watt
  • +
  • Marina Floating Thermometer with Suction Cup
  • +
  • Zoo Med Laboratories AZMBL20 Betta Hammock
Total price: $17.97
Buy the selected items together

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Size: 50-watt
  • Buy Used and Save: Buy a Used "Tetra 26447 Submersible Aquarium Heater, 50-Watt" and save 59% 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)
  • ASIN: B000OQO69Q
  • Item model number: 26447
  • Average Customer Review: 4.1 out of 5 stars  See all reviews (885 customer reviews)
  • Amazon Best Sellers Rank: #787 in Pet Supplies (See Top 100 in Pet Supplies)

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

The manufacturer commented on the review below
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!
7 Comments 67 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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The manufacturer commented on this review(What's this?)
April 21, 2016
The current model of this particular heater actually has a built in shut off valve as a safety feature to prevent overheating. Additionally, very few heaters sold malfunction and those that do are generally due to improper use or lack of proper care. Please keep in mind that this heater must always be submerged, and never exposed to air while plugged in. It should not be buried in gravel or sand or having anything pressing up against it. Once a month, unplug the heater, let it cool down, and remove it for cleaning. Using a soft cloth, hot water and/or distilled white vinegar, gently clean the heater. When placing it back in the tank, attach it properly to the side of the tank, allow it to sit, unplugged, for a few minutes to adjust to the tank water temperature again, then plug it in. Also, always keep a thermometer on the tank and check temperature daily. For more information, contact the Tetra Consumer Relations Team at 1-800-526-0650.
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.
12 Comments 161 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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The manufacturer commented on the review below
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.
19 Comments 158 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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The manufacturer commented on this review(What's this?)
April 21, 2016
I have to point out that this is a very old review, from 2011. The current model of this particular heater actually has a built in shut off valve as a safety feature to prevent overheating. Additionally, very few heaters sold malfunction and those that do are generally due to improper use or lack of proper care. Please keep in mind that this heater must always be submerged, and never exposed to air while plugged in. It should not be buried in gravel or sand or having anything pressing up against it. Once a month, unplug the heater, let it cool down, and remove it for cleaning. Using a soft cloth, hot water and/or distilled white vinegar, gently clean the heater. When placing it back in the tank, attach it properly to the side of the tank, allow it to sit, unplugged, for a few minutes to adjust to the tank water temperature again, then plug it in. Also, always keep a thermometer on the tank and check temperature daily. For more information, contact the Tetra Consumer Relations Team at 1-800-526-0650.
The manufacturer commented on the review below
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.
8 Comments 74 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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The manufacturer commented on this review(What's this?)
April 21, 2016
This is a very old review, and it is very unlikely that 3 heaters completely stopped working in only 5 months so let's cover the basic use of an aquarium heater to help clarify what may have occurred. The current model of this particular heater actually has an electronic thermostat that uses a separate low voltage current to maintain the temperature. Additionally, very few heaters sold malfunction and those that do are generally due to improper use or lack of proper care. Please keep in mind that this heater should initially be installed, UNPLUGGED, and allowed to sit for about 15 minutes prior to plugging it in. It must always be submerged, and never exposed to air while plugged in. It should not be buried in gravel or sand or having anything pressing up against it. Once a month, unplug the heater, let it cool down, and remove it for cleaning. Using a soft cloth, hot water and/or distilled white vinegar, gently clean the heater. Algae, hard water deposits, etc, can shorten the life of a heater. When placing it back in the tank, attach it properly to the side of the tank, allow it to sit, unplugged, for a few minutes to adjust to the tank water temperature again, then plug it in. Also, always keep a thermometer on the tank and check temperature daily. For more information, contact the Tetra Consumer Relations Team at 1-800-526-0650.
The manufacturer commented on the review below
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...
1 Comment 53 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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The manufacturer commented on this review(What's this?)
April 21, 2016
The current model of this heater has a safety shut off valve to prevent over heating. Very few heaters ever malfunction, and those that do, are due to improper use or lack of proper care, in most cases. Please keep in mind that this heater must always be submerged, and never exposed to air while plugged in. It should not be buried in gravel or sand or having anything pressing up against it. Once a month, unplug the heater, let it cool down, and remove it for cleaning. Using a soft cloth, hot water and/or distilled white vinegar, gently clean the heater. When placing it back in the tank, attach it properly to the side of the tank, allow it to sit unplugged, for a few minutes to adjust to the tank water temperature again, then plug it in. Also, always keep a thermometer on the tank and check temperature daily. For more information, contact the Tetra Consumer Relations Team at 1-800-526-0650.
The manufacturer commented on the review below
Size: 50-watt Verified Purchase
Awful, just awful. The box states that this heater is preset to 78*, this is not the case. At no time did it keep my poor Betta's 5 gallon tank warmer than 67*. I quickly had to run out to my local pet store and buy a better quality heater. Don't waste your time and money.... For just a few dollars more you can purchase a better quality heater that will keep your fish happier and healthier!
1 Comment 13 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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The manufacturer commented on this review(What's this?)
April 21, 2016
This particular model of heater has an electronic thermostat that uses a separate low voltage to maintain the temperature. We have had very few issues with this heater. In most cases where not heating is reported, the heater is not properly sized or installed. Also, the customer may not have a full hood covering the entire surface of the tank. Additionally, very few heaters sold malfunction and those that do are generally due to improper use or lack of proper care. Please keep in mind that this heater must always be submerged, and never exposed to air while plugged in. It should not be buried in gravel or sand or having anything pressing up against it. Once a month, unplug the heater, let it cool down, and remove it for cleaning. Using a soft cloth, hot water and/or distilled white vinegar, gently clean the heater. Not removing hard water deposits or algae on the heater can prevent the heater from properly detecting the water temperature. When placing it back in the tank, attach it properly to the side of the tank, allow it to sit unplugged for a few minutes to adjust to the tank water temperature again, then plug it in. Also, always keep a thermometer on the tank and check temperature daily. For more information, contact the Tetra Consumer Relations Team at 1-800-526-0650.

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