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 26446 HT Submersible Aquarium Heater With Electronic Thermostat, 100-Watt, Multicolor, 10-30 Gallon

Tetra 26446 HT Submersible Aquarium Heater With Electronic Thermostat, 100-Watt, Multicolor, 10-30 Gallon

Product ID: 2956715

Details

Brand
Tetra
Color
Black
Item Weight
5.6 ounces
Material
Alloy Steel
Wattage
100 watts

🔥100W power for stable warmth

🌡️Electronic thermostat at 78°F

🔴🟢Dual indicator lights for heating status

€ 41.03

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Description

🔥 Keep your aquarium cozy and your fish thriving — never miss a beat!

DURABLE SAFE - Heat and shock-resistant glass with UL listing guarantees long-lasting, worry-free use.
POWERFUL PRECISE - 100-watt heating capacity ideal for 10-30 gallon tanks ensures reliable temperature control.
VISUAL HEAT STATUS - Red and green indicator lights keep you informed at a glance—no guesswork needed.
EFFORTLESS INSTALLATION - Strong suction cup mounts securely inside your tank for hassle-free setup.
CONSISTENT COMFORT ALWAYS - Automatic thermostat maintains perfect 78°F for your aquatic friends.

The Tetra 26446 HT Submersible Aquarium Heater is a 100-watt, UL-listed device designed for 10-30 gallon tanks. Featuring an electronic thermostat that maintains a steady 78°F, it uses silicon carbide crystals for efficient heat transfer and includes dual indicator lights to signal heating status. Its durable, heat-resistant glass and easy-to-attach suction cup make it a reliable, user-friendly choice for maintaining optimal aquatic environments.

Specifications

ASIN	B000OQRJSG
Best Sellers Rank	#11,559 in Pet Supplies ( See Top 100 in Pet Supplies ) #16 in Aquarium Heaters
Brand	Tetra
Brand Name	Tetra
Color	Black
Customer Reviews	4.4 out of 5 stars 16,768 Reviews
Global Trade Identification Number	00046798264460
Included Components	Aquaria 75026446: Tetra Submersible Aquarium Heater 100Wt
Item Type Name	Aquarium Heater
Item Weight	5.6 ounces
Manufacturer	Tetra
Material	Alloy Steel, Plastic
Material Type	Alloy Steel, Plastic
Model Number	26446
Part Number	AQ-26446
UPC	046798264460
Unit Count	1 Count
Warranty Description	See label
Wattage	100 watts

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€ 41.03

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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