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

Tetra R Ht Submersible Aquarium Heater

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Description

🔥 Keep your aquatic oasis perfectly cozy—effortless warmth, zero worries!

DISCREET COMPACT - Slim, submersible design hides seamlessly behind décor.
SAFETY FIRST DESIGN - Auto shut-off on electrical shorts keeps your aquatic friends safe.
VISUAL HEATING FEEDBACK - Red and green indicator lights keep you in the know at a glance.
UNIVERSAL FIT FOR SMALL TANKS - Optimized for 2-10 gallon aquariums with easy vertical or horizontal installation.
EFFORTLESS TEMPERATURE CONTROL - Maintains a perfect 78°F automatically—no fiddling required.

The Tetra HT 50-Watt Submersible Aquarium Heater features a built-in electronic thermostat that maintains a consistent 78°F, ideal for tropical fish in 2-10 gallon tanks. Its compact, fully submersible design allows flexible installation, while dual indicator lights provide real-time heating status. Safety is prioritized with an automatic shut-off during electrical shorts. Trusted by over 16,000 users, this UL-listed heater combines reliability, ease of use, and sleek concealment for a flawless aquatic environment.

Specifications

ASIN	B000OQO69Q
Best Sellers Rank	#8,014 in Pet Supplies ( See Top 100 in Pet Supplies ) #14 in Aquarium Heaters
Brand	Tetra
Brand Name	Tetra
Color	Black
Customer Reviews	4.4 out of 5 stars 16,724 Reviews
Global Trade Identification Number	00046798264477
Included Components	Aquaria 75026447: Tetra Submersible Aquarium Heater 50Wt
Item Type Name	Aquarium Heater
Item Weight	0.49 Pounds
Manufacturer	Tetra
Material	glass
Material Type	glass
Model Number	26447
Part Number	AQ-26447
UPC	046798264477
Unit Count	1 Count
Warranty Description	Two year warranty
Wattage	50 watts

Reviews

S**S

8.05.2025

A**A

30.12.2025

J**H

2.11.2025

A**V

10.04.2026

K**N

12.01.2012

E**S

28.12.2025

L**L

7.10.2020

K**E

17.10.2025

A**V

29.11.2025

E**N

25.02.2025

J**R

9.05.2022

M**Z

2.11.2025

T**I

4.10.2025

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€ 37.68

Duties & taxes included

In stock

Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

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Tetra(R) HT Submersible Aquarium Heater

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