HT Submersible Heaters

Product No. 26447

HT Submersible Heaters is rated 2.1 out of 5 by 116.
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Tetra's HT line of heaters are easy-to-use and work in aquariums ranging from 2 to 55 gallons. The heaters have electronic thermostats that automatically adjust heat output to keep water at a constant 78 degrees F. All HT heaters have indicator lights to let you know when the heater is on, heating the aquarium.

All Tetra HT heaters have red/green indicator lights to let you know when the heater is heating(red) or on standby(green). The low voltage thermostat maintains water at 78°F without any adjustment required. Be sure purchase the correct heater for your tank size. Buying a heater too small for your tank can cause under heating. It is critical to ensure your tank is equipped with a hood or glass canopy to contain the heat inside the aquarium. All Tetra HT Heaters will shut off if an electrical short is detected for your safety.


This product comes in the following sizes:
HT10 (50 watt) - 2-10 gal
HT30 (100 watt) - 10-30 gal
HT40 (150 watt) - 30-40 gal
HT55 (200 watt) - 40-55 gal
Rated 1 out of 5 by from My tank is always cold I’ve had this heater for months and it doesn’t work. You might as well burn the cash and use it to heat your aquarium because it would be better than this.
Date published: 2019-09-01
Rated 3 out of 5 by from Hasnt heated at all. I only bought this today. Im upset i didnt see the reviews because it seems to not be working. The red light will come on but the water is still super cold. I need my turtle to be warm so that he can digest his foods. Im hoping it will start to work soon. If it doesnt im gonna have to take it back to the store.
Date published: 2019-06-21
Rated 1 out of 5 by from A Very Sad Day So I get home and start my normal morning routines, feed the doggy and get ready to feed the fishies. I look over at the aquarium and suddenly see almost all of my fish are dead. :( I went to the aquarium to try and figure out what was going on and realized it was very hot to the touch, I could actually feel the heat radiating off of it when I was close. Then I see the red light to the Tetra heater is still on, that is when I realized that it must have malfunctioned and stayed on, which had to of occured just recently because I didn't notice any issues when I was feeding them yesterday. This so absolutely sucks. I loved those little guys and gals, I know this is going to sound weird maybe but I had several of the goldfish for several years, in fact I just gave away 2 or 3 of the largest ones recently to a friend, they were probably 5 to 6 inches long and I had them since they were tiny. This is just such a kick in the gut. Tetra USA How can I ever trust your products again? I just started looking up reviews for your heaters such as mine and there are so many other stories like mine that I saw. I just hope the few fish I have left make it. :( :( I feel so sick right now....
Date published: 2019-06-17
Rated 1 out of 5 by from not good Have had the same issue as most of the other reviews. Shuts off after 30 secs. When I feel the heater under the water it is very hot. Moved to different locations and positions and still same thing. It is going back to the store.Given the number of negative reviews it seems to be a design flaw. I will return to using my heat mat designed for seedlings. .
Date published: 2019-04-23
Rated 1 out of 5 by from Save your money and buy from another brand! I bought this heater from Walmart recently and yesterday was the first time I've used it. At first, I thought there was an auto shut off feature that it has, but I dipped my finger into my tank (2 gallons) and the water was super cold. The heater lasted about 8 hours, and then every time I would unplug/plug it back in, the heater's light would briefly turn on for about a minute, just before shutting off again. If you're thinking about buying this product, please save your money and buy from anoter brand.
Date published: 2019-03-28
Rated 1 out of 5 by from Won't Heat Bought in June 2018 and stopped heating in March 2019 not good. What is the warranty?
Date published: 2019-03-07
Rated 4 out of 5 by from Works but.. There is no green light like it says there is supposed to be. This does seem to hold my tank at 25.1C/77F which is a good temperature. Red lights comes on a few times an hour to indicate it’s heating but like I said no green light illuminating when it’s “satisfied” mine is the 200watt version which I think was the highest I could find at Walmart.
Date published: 2019-02-02
Rated 4 out of 5 by from It works When I first got it, I put it vertical and it didn't hear the tank. Moved it horizontally and heated the tank to 74f. My Betta then some how got stuck behind it and cooked itself. So today I put it inside my aqua tech 20-40 propeller chamber and it currently has the water at a temperature of 76-77f. Honestly I would recommend it because it has a good warranty and it cheap. I think this heater may have a design flaw. When it was in the aquarium it would turn off and on constantly but in the filter, it on for a long time until water temperature achieved. It thermostat might be too close to the heating unit that the freshly heated water is tripping the thermostat to turn off too soon
Date published: 2019-01-14
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