HT Submersible Heaters

Product No. 26447

HT Submersible Heaters is rated 2.1 out of 5 by 102.
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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 sad these do not last very long. now temp is dropping to high 20's ad the no longer heats.
Date published: 2017-10-21
Rated 5 out of 5 by from Installs easily... convenient size Called Tetra toll-free line from WalMart. Sarah answered immediately, and assured me that this little heater would be appropriate. Just installed this in a very small 1.25 gallon tank for a betta. The water level is only 6.5 inches, but this little heater just fits nicely. We already had the water at 79 degrees, so the heater didn't kick in right away. When it did drop below 78 degrees,, you could easily see the blue light cycle on and off. We'll see how durable it is, but so far it's a nice fit for our needs and the price.
Date published: 2017-10-19
Rated 2 out of 5 by from It’s not great This thing won’t stay heating even if it’s below temperature. I think my fish are getting cold because they’re sluggish, and not as playful as they used to be
Date published: 2017-10-11
Rated 1 out of 5 by from Doesn't work Bought a heater for my 10 gallon tank. After 36 hours of waiting for it to get to the correct temperature it was still under 60 degrees. I went back to the store and exchanged it for another one of the same kind. Ive waited another 36 hours and THIS one is not working either!
Date published: 2017-10-06
Rated 3 out of 5 by from It works. I have 2 turtles, and I brought one for the tank. I, also, thought it wasn't working. Didn't have a thermometer at hand. Instead, I secured the heater in my sink, filled it with "less than room temp" water, waited 15 minutes, and plugged it in. Got a red light. The product works, but is it accurate.
Date published: 2017-09-10
Rated 1 out of 5 by from Wont turn on... I bought one just yesterday for my tropical fish. I set it up in the tank and plugged it in but it never turned on...the water feels kind of cold..i don't know if that means its as warm as it needs to be but im worried about my fish...one of them is mainly staying at the bottom of the tank and i don't know what it means....
Date published: 2017-09-05
Rated 1 out of 5 by from Not good at all I bought this heater 4 days ago and it hasn't heated the tank at all! 3/6 of my fish are still alive! I set up the heater 2 days after I got the tank then after 24 hours(which the box says to wait so the heater can start working) I put the fish in but nothing happend. Very disappointed
Date published: 2017-08-22
Rated 1 out of 5 by from Heater Failure This is my third heater in 5 months due to heater failure.
Date published: 2017-08-20
Rated 1 out of 5 by from absolute garbage great idea for a automatic temperature set heater but only if it remains working longer than a month! Lost my receipt so store wouldn't exchange and tetra will be of no help without it so I'm beat out of $30 I guess. Have a few tanks over many years and never, ever, had a heater die so I didn't think I'd need to keep the receipt.
Date published: 2017-08-19
Rated 1 out of 5 by from BROKE ON THE FIRST DAY?!?!??!?! I bought two of these for my 2 10 gallon tanks and they don't work, now my poor fish are going to have to be cold. One had the red light indicator on for a split second then immediately turned off and didn't even heat the water... I even tested it in other tanks and the 2nd one just didn't turn red at all and doesn't heat and can I just say the water in my tank was cold and the heater DIDN'T WORK. BIGGEST WASTE OF MONEY EVER. Too bad this bad heater is the only one Walmart sells, I live in a secluded town where Walmart is basically the only place unless I want to drive 1-2 just to get to the nearest pet store
Date published: 2017-07-26
Rated 1 out of 5 by from Terrible heater I bought this two weeks ago for a baby turtle and it stopped heating after 20 minutes. Will never buy another tetra heater.
Date published: 2017-07-25
Rated 1 out of 5 by from Worst heater ever Never kept the temp stable and stopped working after two weeks. Worst purchase ever. Glad it didn't cook my fish at least
Date published: 2017-07-11
Rated 1 out of 5 by from Broken? I got the 10-30 gallon heater for my boyfriend for his 10 gallon, when we plugged it in the light didn't kick on at all and when it did the red light blinked red and then shut off again. I have one in my tank as well and the red and green light alternate like they should but the water is still cold and it's next to the filter to push the warm water around the tank.
Date published: 2017-07-07
Rated 2 out of 5 by from only heats up to 73 or 74 i bought this heater 2 weeks ago and it only keeps the tempature at 73 or 74.. my house is 70-71.. is there a way to make it closer to 80
Date published: 2017-06-27
Rated 4 out of 5 by from Does the job! Glad I didn't read these reviews before I purchased this at Walmart or I doubt I would have bought it! Great bang for your buck. Taking away one star only because of it's a little too thick for my 2.5 Top Fin aquarium, wish it was more slim & streamlined better with Johnny's (our betta) aquarium. But, for 15 bucks, it's well worth seeing him swim happily around his tank! He's most liveliest I've seen him in months! Thanks for making something affordable, Terra. Grad student: University Tennessee College of Law, Class of 2021
Date published: 2017-06-24
Rated 3 out of 5 by from Indicator light NOT working! I recently bought this heater for my 10 gallon fry tank and after letting it acclimate to the water temperature inside the tank for 15 minutes I plugged it in and waited for the indicator light to come on, it never did! I've had success with this heater in my 29 gallon aquarium, the indicator light works just fine it turns red when heating and green when not. So I don't know what's wrong?!
Date published: 2017-06-13
Rated 1 out of 5 by from Doesn't work at all I've bought this heater twice now. The first one I bought works just fine and hasn't given any problems. Turns red when is heating and the light turns off or something when it's heated up, but the one I bought recently is a different story. I put it into the tank long before the fish were in there. I set it up according to directions, and after it was plugged in, the light turned red. I walked away for 5 minutes, came back, and the light was green. I let it go a little longer thinking it needed time to adjust, but it's been over 2 weeks now and the light is only red when I first plug it in then immediately turns green. The water is not heated at all, and now my fish are getting sick from the water being too cold.
Date published: 2017-06-11
Rated 3 out of 5 by from Nice while it lasted Purchased latest one Mar '16 and it just failed. Second or third time replacing these heaters (10 gal tank; ambient 70+) so I keep spares. Seems no way to "reset" thermostat, so green light in 60F water. Great heater when it works.
Date published: 2017-06-11
Rated 1 out of 5 by from Malfunctioned after only a month Bought the HT30 for my 20 gallon tank. After only a month, it stopped heating my aquarium water although the red indicator light was still displaying.
Date published: 2017-06-11
Rated 4 out of 5 by from Works well I am very happy with this heater. I have two 3.5 tanks and originally had another, slimmer heater in one. The temp shot up from 72 to 82 in 8 hrs! So I switched and this one keeps the temp steady at 80. It slowly brings the temp up ( or down) so the red light will come on and off while it is heating. I bought another one for the 2nd tank and now my betta are even more active! My only compliant is that it is pretty unsightly and bulky for a small tank. But I'd rather have one that works well than looks good!
Date published: 2017-05-31
Rated 1 out of 5 by from Not even sure if it's working I bought this a few months ago for my 10 gallon and I didn't really think it was doing anything but I wanted to give it some time to see if it was doing it's job. Today when I was cleaning my tank I checked up on it and it's absolutely cold to the touch. The room it's in is a bit warmer than the rest of the house so I'm sure it isn't related to over working. I'm overall a little disappointed in this product's performance.
Date published: 2017-04-16
Rated 1 out of 5 by from Won't get above 70 I just bought this thermometer for a 1 gallon tank and it just keeps the temperature at 69/70 degrees. I returned the first one as I thought it was broken, but the 2nd one does the same thing. Can't blame it on a big tank, but I do keep my house pretty cool.
Date published: 2017-04-14
Rated 3 out of 5 by from Light doesn't turn on Whyyyy?????? I know it is working but doesn't light on? Should I replace it? I do not want to fry my little fishes and read some reviews of overheating.
Date published: 2017-04-12
Rated 2 out of 5 by from Heater does not work I bought this heater a few weeks ago at a local store and it does not keep the water at a constant temperature. The green light shows even when the water is way below the temperature what the heater is supposed to heat to and the water is way too cold. Because of this, my betta developed ick.
Date published: 2017-03-13
Rated 2 out of 5 by from Disappointed.. I purchased the Tetra 2-10 gal heater for my 10 gallon aquarium about 2 weeks ago from walmart. Stocked with 4 guppies and 2 mystery snails. All of which need warm water... the supposed "preset temp" of 78 is inaccurate. This heater is for a 2-10 gal tank.. min is 10.. so my water should be at 78 and it's barely above 70. I purchased a 10-30 gal tetra heater for my other 10 gal tank probably 7 months ago and it works like a charm. Keeps the water at 78.. that is why I am so disappointed...
Date published: 2017-03-05
Rated 1 out of 5 by from Light won't turn on Just bought it today at Walmart. Put togther the new tank and the light wont turn on red or green. Its been submerged for 5 hours now. Help . . . Anyone??
Date published: 2017-03-01
Rated 2 out of 5 by from Didn't Last Heater performed as advertised for 6 months. Unfortunately, the heater stopped cycling and my small 5 gallon tank temp went south. I did not lose any of my cardinal tetras but had to replace the heater way too soon.
Date published: 2017-02-26
Rated 2 out of 5 by from I'm still wondering I bought this a few hours ago and read the instructions, went online to see videos of people with the same problem but..they didn't explain it very well. The problem I'm haveing is when I submerge it (is laid mine down) I've let it sit for 30 min and plugged it in. The red light came on for i say a minute then shuts off. It does this for some time turningredients off and on. When I reach down to feel if it's getting warm it'seems warm but..the tank still cold my tanks a 2.5 gallon tank and the temperature is a little on twenty. I've made sure the thermometer works (it does). My fish I just bought today is a betta and I know they can SURVIVE without a heater but they don't THRIVE. I'm just worried if I let him acclimate he'll get cold and if I don't he'll stay in his still mall cup (yes, I put him in a clean one) a little help here? Thanks.
Date published: 2017-02-25
Rated 1 out of 5 by from Not Consistent This heater does not keep my 3.5 gallon tank at a constant temperature of around 78 and now my Betta has ick! Will not buy this brand for future tanks...
Date published: 2017-02-15
Rated 1 out of 5 by from didnt last i had this heater for less than a week and the light kept going red to green. then it cracked and stuff started coming out of the cracks.
Date published: 2017-02-10
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