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 2 out of 5 by from I’m confused I’ve had this thermometer in my tank for 3 hours and it hasn’t changed the water temperature. The red light shuts off after 1 minute of being plugged in. I will purchase another one to see if this problem persists. I have a thermometer in my tank and it reads at a constant 50 degrees Fahrenheit. No green light is on.
Date published: 2018-10-12
Rated 1 out of 5 by from Didn't Work It worked well for about a month then the green light was always on. I monitored the tank temp and the water was not being warmed at all. I tried it in a few of my other tanks with the same result. Very frustrating. I wish I had read the reviews before I purchased this item
Date published: 2018-10-10
Rated 1 out of 5 by from Poor heat regulation Tetra team, I believe you're too quick to dismiss reports of poor performance from this heater. I purchased a HT10 for a small Fluval aquarium to replace a Marineland heater that broke after several years of good service. As others have reported, it does not cycle properly, only holding about 70F. It's going back to the store.
Date published: 2018-10-10
Rated 5 out of 5 by from works great, works great, but just wondering how deep can i put it it in the water?? all the way in? im using a large jar, so wanting to stuff it deeps as possible to leave room for the filter at the top.
Date published: 2018-09-21
Rated 5 out of 5 by from WORKS GREAT SO FAR! My new 6 gallon tank was only at 70 degrees so I installed the HT10. Raised the temperature to 78 degrees within a few hours and has been keeping it there since. No complaints here!
Date published: 2018-09-21
Rated 1 out of 5 by from Horrible I have had the heater for 2 months now and I moved on month 1 when I got to my new house I opened the heater for the 1st time since than the temp stays at roughly 68 degrees the light comes on but this heater does not produce heat and it should be recalled immediately a lot of people will lose the fish that they love!!!
Date published: 2018-08-30
Rated 4 out of 5 by from Just bought it but I need answers Quick question. So if the temp in the tank is 76-78 in the tank, The heater simply shuts off? I just bought it for my betta in a 10 G tank and I dont want him to get stressed because the heater fails so bring up the temp.
Date published: 2018-08-25
Rated 1 out of 5 by from Doesn’t work I’ve kept aquariums for decades. Made the mistake of buying this because I didn’t want to drive to my normal shop. Good price. Doesn’t even turn on. Too bad I threw away the box already. Waste of $20.
Date published: 2018-08-24
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