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 With Electronic Thermostat, 50-Watt, 2-10 Gallon

Product ID: 2118461

Details

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

💡Dual-color indicator light

🔒Auto shut-off safety feature

🔥50W precise heating power

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₨561

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Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Keep your tropical fish cozy with precision and peace of mind!

SAFETY FIRST - Automatic shut-off on electrical shorts protects your aquatic ecosystem and your home.
DURABLE RELIABLE - Heat- and shock-resistant glass with silicon carbide crystals ensures even heat distribution and long-lasting performance.
VISUAL HEATING STATUS - Red and green indicator lights keep you informed at a glance—know exactly when your tank is heating or stable.
SLEEK DISCREET DESIGN - Compact, fully submersible heater fits seamlessly in 2-10 gallon tanks, hiding behind décor for a clean look.
EFFORTLESS TEMPERATURE CONTROL - Built-in electronic thermostat maintains a perfect 78°F—no manual adjustments needed.

The Tetra HT 50-Watt Submersible Aquarium Heater is engineered for 2-10 gallon tanks, featuring an electronic thermostat that auto-maintains 78°F, dual-color indicator lights for real-time status, and an automatic shut-off safety mechanism. Its compact, fully submersible design with durable glass construction ensures reliable, discreet heating—perfect for millennial aquarists seeking hassle-free, stylish fish care.

Specifications

ASIN	B000OQO69Q
ASIN	B000OQO69Q
Batteries	Product Specific batteries required.
Best Sellers Rank	#9,561 in Pet Supplies ( See Top 100 in Pet Supplies ) #14 in Aquarium Heaters
Brand Name	Tetra
Color	Black
Customer Reviews	4.4 4.4 out of 5 stars (16,751)
Date First Available	March 22, 2007
Department	Unisex-Adult
Global Trade Identification Number	00046798264477
Included Components	Aquaria 75026447: Tetra Submersible Aquarium Heater 50Wt
Is Discontinued By Manufacturer	No
Item Type Name	Aquarium Heater
Item Weight	7.84 ounces
Item model number	26447
Manufacturer	Tetra
Manufacturer	Tetra
Manufacturer recommended age	1 month and up
Material Type	glass
Model Number	26447
Part Number	AQ-26447
Product Dimensions	5.25 x 1.62 x 3.5 inches; 7.84 ounces
UPC	046798264477
Unit Count	1 Count
Warranty Description	Two year warranty
Wattage	50 watts

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