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Tetra 26446 HT Submersible Aquarium Heater

Curated from 118 real Reddit conversations

Refreshed on: April 1, 2025

Tetra 26446 HT Submersible Aquarium Heater

Brand: Tetra

Price: $7

Snoop Score:

5.4

Sentiment

5.3

Popularity

5.3

Technical

5.1

Buy on Amazon for $7 See All Aquarium Heaters Reviews

As an Amazon Associate, I earn from qualifying purchases.

Snoop's Take

The Tetra 26446 HT Submersible Aquarium Heater is designed to maintain a consistent temperature in aquariums ranging from 10 to 30 gallons. Featuring an electronic thermostat, this heater ensures that your aquatic environment remains at an optimal 78 degrees, making it ideal for both beginner and experienced fish keepers. Consumer sentiment around the Tetra heater is largely positive, with many users praising its ability to keep the water temperature steady, as one user noted, "it puts out good heat and it's making my office pretty vibe-y." Additionally, the heater's simple setup and secure attachment have been highlighted, although some users faced difficulties with the legs. However, there are notable concerns regarding heater reliability, with feedback indicating issues such as multiple units failing to function properly and preset temperatures being unreliable. Overall, the Tetra 26446 HT Submersible Aquarium Heater is recommended for budget-conscious aquarium owners looking for a reliable heating solution, but potential buyers should be aware of the mixed reviews regarding reliability and operational issues.

Not for you? Check out our other rated Aquarium Heaters

it puts out good heat and it's making my office pretty vibe-y
Positive Feedback

okay - how the FUCK did you get the legs on?
Negative Feedback

5.4

Tetra 26446 HT Submersible Aquarium Heater

Buy on Amazon for $7

Freshwater Aquariums

4 / 10

Saltwater Aquariums

4 / 10

Marine Life Habitats

4 / 10

Small to Medium Tanks

4 / 10

See how this compares to all Aquarium Heaters

What it does well!

Key strengths users can’t stop talking about.

Keeps aquarium temperature steady

“it puts out good heat and it's making my office pretty vibe-y”➕

“Constant temp after all it has “auto temp technology””➕

Simple setup with secure attachment

“It was a PITA.”➕

“Overall, I'm happy with it.”➕

Keeps the whole tank an even temperature

“Keeps the whole tank an even temp”➕

“I concur, that way you can get the best heat dispersal and the most accurate reading of the thermometer.”➕

Easy to install in different positions for optimal heat distribution

“I’d put it upright next to the intake and output so it spreads the heat.”➕

“Yep this is the way to go.”➕

“Better distribution of heat and you don’t have to worry about unplugging during tank maintenance.”➕

Reliable brand with consistent performance

“Solid reliable brand & you have the correct tank size for that product.”➕

“I have used Tetra heaters for years and I have never had one fail me.”➕

Heater brings tank to optimal temperature

“Is this normal? Should I get a refund and return it?”➕

“As water currents move warmed water away from it, the light should go on and off.”➕

“the light comes on and off as the heater warms up and then goes off once it hits high heat.”➕

Where it needs some work!

Areas to watch—feedback on possible improvements.

Difficult to attach legs

“okay - how the FUCK did you get the legs on?”➕

Possible noise from operation

“there's a noticeable fan noise blowing the heat outwards from the unit.”➕

Concerns about heater placement and water level safety

“I accidently forgot to turn mine off once when it was vertical during a water change, the water level got too low and the heater started smoking!”➕

Multiple heaters purchased failed to function

“None of my heaters work. Literally none.”➕

“At this point I am ready to lose it. My fish are freezing and idk what the fuck to do.”➕

Heaters turning off due to lack of water circulation

“They are supposed to turn on and off as needed based on tank temp.”➕

“Most if not all heaters run on either a timer or turn off automatically once the water reaches a certain temperature.”➕

“The water wasn't circulating enough in the area so it turned off constantly.”➕

Heater fails to maintain temperature

“Wouldn't say I absolutely recommend this, but if you are on a budget and looking for a heater for at least a 15 gallon tank, this one works.”➕

“This one is probably the worst of the ones I have honestly.”➕

“the heater outright dying on a quarterly basis is really frustrating.”➕

Multiple units stopped working

“I have went through three of these heaters in one year. They eventually quit working.”➕

Preset temperature is unreliable

“Presets as you mentioned can be unreliable.”➕

Heater can cook fish when it breaks

“When they break they can cook all your precious fish. I just don't trust heaters.”➕

Compare On All Talked About Dimensions

Product Name	Price	Score	See Details	Buy Now
AQQA Aquarium Heater 500W for 66-135 Gallon Fish Tanks	$25	7.3	Details	Buy
Fluval E 300 Watt Electronic Heater	$34	7.2	Details	Buy
HITOP 50W Adjustable Aquarium Heater	$11	7.1	Details	Buy
HiTauing Aquarium Heater - Submersible Fish Tank Heater	$37	6.8	Details	Buy
hygger Aquarium Heater with Digital LED Controller	$43	6.5	Details	Buy
Aqueon Submersible Aquatic Flat Heater 15 Watts	$7	6.5	Details	Buy
Dreyoo 2 Set Aquarium Fish Tank Heater	$23	6.0	Details	Buy
HITOP-Fish Hitop 100W Adjustable Aquarium Heater	$14	5.8	Details	Buy
HiTauing Aquarium Heater - 100W Fish Tank Heater	$24	5.8	Details	Buy
DaToo Aquarium Heater Adjustable 50W	$6	5.7	Details	Buy
Tetra 26446 HT Submersible Aquarium Heater	$7	5.4	Details	Buy
Aqueon Pro 300 Submersible Aquarium Heater	$48	5.4	Details	Buy
MarineLand Precision Heater for Aquariums	$13	5.0	Details	Buy
HITOP Compact Submersible Aquarium Heater - 200W	$19	4.9	Details	Buy
Fluval M 200-Watt Submersible Aquarium Heater	$36	4.8	Details	Buy
PULACO 25W Small Aquarium Submersible Betta Heater	$9	4.3	Details	Buy
Aqueon Aquarium Fish Tank Preset Heater	$18	4.1	Details	Buy
hygger Small Submersible Aquarium Heater 100W	$22	3.6	Details	Buy
Orlushy Submersible Aquarium Heater, 150W	$19	3.4	Details	Buy
FREESEA Aquarium Heater for Fish Tank	$27	3.0	Details	Buy
FREESEA Aquarium Fish Tank Heater 50W	$16	2.6	Details	Buy

Core Power Plays

The specs and strengths that make it shine.

Temperature reached around 78°

“That shit is hot son, around 78°.”➕

Concerns about product plateau in long-standing companies

“Tetra has the same issue that many long-lived companies have - product plateau.”➕

Personal experiences with heater effectiveness.

“my fish are thriving with this, i think fish appreciate temperature fluctuations.”➕

“I now keep a heater in there set for 70° so it only kicks on when it's abnormally cold.”➕

Discussion on the necessity of heaters in tanks

“Do most of us really need to run our tanks as warm as they are?”➕

“I agree that you're probably not gonna kill your tetra or similar tropical fish if you keep the water at 72 vs 78 F.”➕

Hidden Hero Hacks

Unexpected tricks and side‑door uses you’ll love.

Discussion on heating water for camping using aquarium heaters

“Instead of the traditional “on demand” propane hot water systems we all know of, a small 300 watt aquarium water heater dropped in a bucket of water.”➕

“Yes. They work great.”➕

“Definitely a few variables to consider with power draw.”➕

“I could just as easily do this with my camping stove or a kettle of which I already own.”➕

Discussion about alternative heater solutions

“Has an adjustable visible temperature digital gauge with a smart range colour indicator, plastic cover for added protection and fully submergable.”➕

“BUY HEATER AND THERMO STAT SEPARATE.”➕

“it’s very accurate and safe due to it being enclosed in plastic.”➕

Recommendations for alternative temperature control

“With the thermostat/controller you can get some real peace of mind.”➕

“Thanks, great idea! I didn't know these types of controllers existed.”➕

“get a cheap ebay digital thermometer so you can always drop an eye on the temp.”➕

Buyer’s Cheat Sheet

What to check before you click ‘Add to Cart.’

Advice on heater usage and safety

“let it sit in the tank unplugged for about 30 mins before plugging it in and never take it out of water while plugged in.”➕

Aquarium heaters are visually unappealing

“Aquarium heaters are ugly The are gaudy colours that stick out like a sore thumb in my aquarium.”➕

Preference for alternative heating solutions

“This is why I went with a canister filter that had a built in heater.”➕

“I'm not impressed with the heater whatsoever.”➕

“This is why I only use overflow tanks and I put the heater in the back where the filter is.”➕

“it worked well for many years without issue.”➕

Tetra marketed towards beginners

“It’s marketed towards beginners as well.”➕

Fish can tolerate lower temperatures than expected.

“Of course they will be fine.”➕

“I find that tropical tanks are often hotter than they need to be.”➕

“There's a reason Cory from Aquarium Coop advocates for only using heaters under particular circumstances.”➕

“We stay around 55-75 all year during the day but occasionally drop to the high 30s at night.”➕

Cautionary Callouts

Know the pitfalls before they catch you off guard.

Concerns about surface heat for pets

“does it get hot at all on the surface? worried about a pet”➕

User skepticism about the quality of heaters

“Not sure if I helped or brought any idea's to the field but - my .02$.”➕

Skepticism towards reliability of generic heaters

“I would rather not come home to toasted fish.”➕

“Any generic heater will work. Go with a 50 watt or 100.”➕

Aquarium heaters are generally inefficient with high power draw

“Aquarium water heaters are going to top out around 80 degrees, and are relatively inefficient for the power draw.”➕

Considerations on safety and material for aquarium heaters

“Don’t use one with glass. Better find one that is all metal.”➕

“That’s why when they fail (up or down) fish can get hurt.”➕

Tetra brand associated with low quality products

“I guess I associate the Tetra brand with cheap, low quality products marketed towards beginners.”➕

“Tetra products are regularly the cheapest on the market.”➕

“Tetra products are regularly the cheapest on the market. Their filters, foods, and air pumps are alm”➕

Concerns about keeping fish without heaters.

“Fish are cold blooded so higher temps equal higher metabolism which equals shorter life span.”➕

“20c is perfect for all the fish you have.”➕

“discus are the exception, not the rule.”➕

Discussion about the effects of temperature fluctuations.

“All tropical fish are fine down to 65 degrees, warmer temps are only needed to trigger breeding.”➕

“water takes much longer to change temp than air.”➕

“My heater broke a week ago and my tank hit ~50° within a couple nights.”➕

Varied opinions on relying solely on heaters versus natural temperatures.

“Yeah I'm pretty sure Dean and Cory in aquarium coop also keep the rooms pretty warm year round.”➕

“most of them are probably more temperature tolerant than we would think.”➕