HT Submersible Heaters

Product No. 26447

HT Submersible Heaters is rated 2.1 out of 5 by 90.
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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 2 out of 5 by from One Today I bought one and doesn't work light doesn't say on the heater not good
Date published: 2018-06-17
Rated 1 out of 5 by from Sucky customer service I contacted customer service to ask about how my heater was malfunctioning, as it was keeping the tank water at 73 degrees instead of the promised "constant 78 degrees". Instead of any help, I was told that 73 degrees was actually normal for the heater, and completely fine for "tropical fish". Problem is, I have bettas. Anything under 78-80 degrees makes them stressed, and it can kill them. TLDR- Heater is malfunctioning, and customer service tried to tell me 73 degrees was okay for betta fish.
Date published: 2018-06-14
Rated 1 out of 5 by from Just Bought One I just bought the 50w and it doesn't seem to stay on. I plugged it in and the light turns on for a minute and turns off.
Date published: 2018-06-12
Rated 1 out of 5 by from Bought a 2nd heater I have one heater for my 10 gal tank. I could not get it past 74. Purchased a second of the exact heater and still 74. Crazy! I can’t get my temp where it needs to be even with 2 heaters
Date published: 2018-05-16
Rated 1 out of 5 by from Failed :-( Was good while it lasted... After about 3 years of sporadic use, it over heated the tank by 10°C!!! Hopefully my betta survived..
Date published: 2018-05-10
Rated 3 out of 5 by from Works great for fish It works great for my betta but my dog chewed my extra one and I don't know what was inside the glass
Date published: 2018-04-25
Rated 2 out of 5 by from Not heating I bought this heater a week ago, but I don’t feel like it’s doing it’s job. It says it’ll maintain the temperature at 78 however mine has not gone past 76. Should I be worried? Is my betta okay with that tempature? Any feedback would help
Date published: 2018-03-25
Rated 1 out of 5 by from Isn’t heating water up I have had this 100w turned on for two days in a 10 gallon tank with 8 gallons of water. My digital thermometer reads 66 degrees. The lights are turning on but it’s not going any higher than 66 degrees. I keep my house at 68 so with the larger heater and not being a lot of water something seems to be wrong with the heater.
Date published: 2018-03-22
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