HT Submersible Heaters

Product No. 26447

HT Submersible Heaters is rated 2.1 out of 5 by 112.
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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 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
Rated 1 out of 5 by from Doesn't heat I just turned this on last night in my son's 3 gallon aquarium. I used warmed water initially and thermometer read 78. This morning I checked and the thermometer read 72. The heater light was green and not red, thus not heating. I then compared the thermometer to a submersible probe and they were within a degree of each other. I even put the probe near the heater, and the temperature was no different. I called the Customer Service number on the box, and they were of no help, talking about the ambient temperature mixing with the water and changing the thermometer's reading. And I had to explain I was also testing with a probe. Will be seeking another brand, and returning this, as it clearly does not do what it is advertised to do.
Date published: 2018-12-28
Rated 3 out of 5 by from Mmm... I bought this as an emergency for my fish that has swim bladder disorder. I needed a quick heater that heats the tank up to a fair degree. It gets to 78 degrees.. i just don’t understand why someone would buy a heater that only heats 6 degrees above room temperature. I just quickly grabbed it off the shelf for my fish but i didn’t expect it to only heat 6 degrees above room temperature. I guess it’s fine but it doesn’t heat even a five gallon tank. only about one gallons so i had to stick my fish in a one gallon.
Date published: 2018-12-28
Rated 1 out of 5 by from lost cause well i was going to make a warranty claim but after seeing all the bad reviews i think i will take my losses and look elsewhere for a new heater. sorry tetra but when a product has this many reviews of being faulty it may be time to go back to the drawing board.
Date published: 2018-12-25
Rated 1 out of 5 by from Poor quality I saw some bad reviews on this product and I should have listened not to buy it. It worked well on my 3 gallon tank and it says on the package that it’s for 2-10gallons but I got a 10 gallon tank and it has failed to keep the temp at 78 like it says. I wish I could get a refund
Date published: 2018-11-27
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