would this work in a one gallon tank?

I wouldnt because the temp on this can go up to 79 degrees in a 10 gallon tank, for that reason i purchased a 10 watt for my 1 gallon tank and it keeps the tank at a perfect temp of 78. Check out the Marina C10 Submersible on Amazon for $10.00.

Description says "the ht30 is adjustable between 72 degrees f and 85 degrees f". ok, why does the one i received say not adjustable, preset at 78?

All of the HT Heaters are preset now. Unfortunately, this is an old image and old description of the former HT 55. The description seems to have been translated to the HT 100 as well. Tetra is working to correct these issues immediately. We appreciate your bringing it to our attention. If you need any other assistance, please contact the Tetra Consumer Relations Team at 1-800-526-0650.

Will this be okay in a 3 gallon betta bowl i'm making? if not any recomendations?

Yea i think so. I seriously look at this every day and im sooooooooooo glad i bought it. My betta looked so depressed before in his bowl because my house gets down to 60 degrees and his water was getting cold and now he is so happy his water stays 78 and he swims like a happy fish and has a lot of bubbles on top (means there happy). Its so crazy that warmer* water can make a fish soooo happy. This is a must. Yes buy it for a 3 gallon tank- i think it will work just fine and your fish will LOVE IT i promise! Let me know how it works out for you- because im so glad i got it!

Does it turns off automatically

When it reaches the right temp. it automatically shuts off. When the light on it is green, it's heating; when the light is red, it's off

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Tetra HT Submersible Aquarium Heater

Product ID: 258020686

Details

Brand
Tetra
Color
Black
Item Weight
7.84 ounces
Material
glass
Wattage
50 watts

📏Compact & space-saving design

🔌Extra-long cord for flexible placement

🔥50W powerful heating

₹ 5138

Duties & taxes included

In stock

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Description

🔥 Keep your aquarium thriving with Tetra’s sleek, powerful heater!

FLEXIBLE SETUP - Long power cord ensures safe, convenient placement away from water sources
SPACE SMART DESIGN - Compact construction fits seamlessly in any tank without clutter
TRUSTED DURABILITY - Built with premium materials for lasting performance and peace of mind
SECURE SUCTION MOUNT - Strong suction cup guarantees stable attachment—no slips, no worries
PRECISION HEATING POWER - 50 watts of reliable warmth keeps your aquatic friends cozy year-round

The Tetra HT Submersible Aquarium Heater delivers consistent, energy-efficient heating with its 50-watt power output. Its compact design and long cord provide flexible, safe installation options, while a strong suction cup ensures secure placement. Crafted from durable materials, this heater is a trusted choice for maintaining optimal water temperature in small to medium aquariums, making it a top-rated accessory among pet enthusiasts.

Specifications

ASIN	B000OQO69Q
Best Sellers Rank	#18,562 in Pet Supplies ( See Top 100 in Pet Supplies ) #1,020 in Aquarium Accessories
Brand	Tetra
Brand Name	Tetra
Color	Black
Colour	Black
Customer Reviews	4.3 out of 5 stars 11,324 Reviews
Global Trade Identification Number	00046798264477
Item Weight	0.49 Pounds
Item weight	0.49 Pounds
Manufacturer	Tetra
Model Number	26447
Part Number	AQ-26447
UPC	046798264477
Unit Count	1.0 Count
Wattage	50 watts

Reviews

E**N

Aquarium heater works great

This heater works fantastically.. I ordered it for my 3.7 gallon aquarium and it had no trouble heating the water up to 76° and maintaining that temperature even in winter when the indoor temperature in my house can drop to about 60° or lower. It has a long cord so you don't need to have your aquarium by the power source which could be dangerous. It secures to your tank by a suction cup which is very strong.. if secured correctly the heater will not come off. Good heater at a good price.. it works great can't complain.

25.02.2025

T**I

Harika!

Mini akvaryumuma uydu. Çok rahatım. Balığım üşüdü mü diye düşünmüyorum. 👍🏻

4.10.2025

P**.

Cumple su función! :)

Excelente producto! Lo compré para usarlo en la tina de agua de mi tortuga que necesita estar entre 24° - 27° C y en épocas de frío baja mucho la temperatura. Mantiene la temperatura deseada calentando aprox. 60L de agua. Mi tortuga y yo estamos felices con la compra :)

18.07.2025

E**O

Follow instructions

This is not to be used in a small bowl. Please listen to what the instructions say. It did not work out for me at all but it was user error. The product itself worked fine.

28.06.2026

V**Z

Perfecto para 20 Litros

Funcional y mantiene el agua de mi pecera a buena temperatura, practico, y fácil de usar

10.12.2024

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