---
product_id: 2956715
title: "Tetra 26446 HT Submersible Aquarium Heater With Electronic Thermostat, 100-Watt, Multicolor, 10-30 Gallon"
price: "$47.38"
currency: USD
in_stock: true
reviews_count: 8
url: https://www.desertcart.us/products/2956715-tetra-26446-ht-submersible-aquarium-heater-with-electronic-thermostat-100
store_origin: US
region: United States of America
---

# 100W power for 10-30 gal Auto electronic thermostat @78°F Dual indicator lights heating/standby Tetra 26446 HT Submersible Aquarium Heater With Electronic Thermostat, 100-Watt, Multicolor, 10-30 Gallon

**Price:** $47.38
**Availability:** ✅ In Stock

## Summary

> 🌊 Keep your aquatic world perfectly cozy — no guesswork, just pure comfort.

## Quick Answers

- **What is this?** Tetra 26446 HT Submersible Aquarium Heater With Electronic Thermostat, 100-Watt, Multicolor, 10-30 Gallon
- **How much does it cost?** $47.38 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/2956715-tetra-26446-ht-submersible-aquarium-heater-with-electronic-thermostat-100)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Durable & Safe Build:** Heat- and shock-resistant glass tube with silicon carbide crystals for even heat distribution and long-lasting performance.
- • **Visual Heating Status:** Red and green indicator lights provide instant feedback on heating activity, so you’re always in the know.
- • **Effortless Installation:** Strong suction cup design ensures secure, hassle-free mounting inside your aquarium.
- • **Optimized for Mid-Sized Tanks:** Perfectly calibrated 100-watt power for aquariums between 10 and 30 gallons, balancing efficiency and reliability.
- • **Precision Temperature Control:** Maintains a stable 78°F to keep your aquatic ecosystem thriving without fluctuations.

## Overview

The Tetra 26446 HT Submersible Aquarium Heater is a 100-watt, UL-listed device designed for 10-30 gallon tanks. Featuring an automatic electronic thermostat that maintains a consistent 78°F, it prevents overheating and extends heater life. Its durable, heat-resistant glass housing with silicon carbide crystals ensures even heat distribution. Easy to install with a secure suction cup, it includes red and green indicator lights to show heating status, making it a reliable, user-friendly choice for maintaining optimal aquatic environments.

## Description

Tetra® HT Submersible Heater is designed to keep your aquatic fish comfortable, with an electronic thermostat that automatically maintains a consistent water temperature of 78 degrees and prevents overheating, extending heater life. An indicator light lets you know when the water is heating (red light) and when it reaches the proper temperature (green light). Inside, silicon carbide crystals improve heat distribution and transfer. The strong glass tube is heat and shock resistant. This submersible heater is easy to use – just attach to the inside of the aquarium wall using the suction cup (included) in an area with good water circulation. The Tetra HT Submersible Heater is available in different wattages to fit your aquarium: use the 50-watt HT10 in 2 to 10 gallon aquariums; 100-watt HT30 for 10 to 30 gallons; 150-watt HT40 for 30 to 40 gallons; and 200-watt HT55 for 40 to 55 gallons. This heater is UL Listed. Since 1951, Tetra has developed the world’s most comprehensive body of fish food knowledge, and fishkeeping enthusiasts have looked to the brand for products and solutions that add ease and beauty to their home. Whether you're an experienced hobbyist or just starting out, Tetra has everything you need – from a large variety of quality fish food and innovative equipment to test kits and decor.

Review: Great little heater. - Works well. I was nervous at first because there was no device to see temperature but its not needed when you have a sticker thermostat. The speed of the temp rising was good to not shock my betta. It took about 24 hours to get to temperature. It had no smell when it started to heat up. It stuck right to glass with no issues, unlike ones I've had in the past, with other company's. When its time to clean it a quick wipe down will do the trick making keeping it clean very easy. It was smaller in size so not too thick and hides off to the side.
Review: Great Heater for smaller aquariums - I’m using the Tetra HT 50-watt heater in a 5-gallon tank, and it’s been excellent so far. The built-in thermostat keeps the water right around 78°F, and the temperature stays steady day and night without needing to adjust anything. I checked it against a thermometer and it’s always within about a degree. Installation was easy — just stick it to the glass with the suction cups and plug it in. The size is perfect for a small tank; it tucks neatly behind a plant and doesn’t get in the way. The indicator light is a nice touch so you know when it’s heating. For a small setup like a 5-gallon betta or shrimp tank, this heater is exactly what you need: simple, quiet, and dependable. Great value for the price.

## Features

- AQUARIUM HEATER: Submersible heater is designed to keep your aquarium at the optimum temperature.
- AUTOMATIC THERMOSTAT: Electronic thermostat keeps water at a consistent 78 degrees.
- INDICATOR LIGHT: The red light shows when water is heating; green indicates that the heater is on standby.
- EASY TO USE: Just attach to an aquarium wall – the suction cup securely attaches heater to tank.
- SIZE: Use this 100-watt heater for 10 to 30 gallon aquariums – UL Listed.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Customer Reviews | 4.4 out of 5 stars 16,598 Reviews |

## Images

![Tetra 26446 HT Submersible Aquarium Heater With Electronic Thermostat, 100-Watt, Multicolor, 10-30 Gallon - Image 1](https://m.media-amazon.com/images/I/81Ic0gLmBNL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: would this work in a one gallon tank?**
A: 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.

**Q: 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?**
A: 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.

**Q: Will this be okay in a 3 gallon betta bowl i'm making? if not any recomendations?**
A: 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!

**Q: Does it turns off automatically**
A: 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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great little heater.
*by A***A on December 30, 2025*

Works well. I was nervous at first because there was no device to see temperature but its not needed when you have a sticker thermostat. The speed of the temp rising was good to not shock my betta. It took about 24 hours to get to temperature. It had no smell when it started to heat up. It stuck right to glass with no issues, unlike ones I've had in the past, with other company's. When its time to clean it a quick wipe down will do the trick making keeping it clean very easy. It was smaller in size so not too thick and hides off to the side.

### ⭐⭐⭐⭐⭐ Great Heater for smaller aquariums
*by J***R on October 24, 2025*

I’m using the Tetra HT 50-watt heater in a 5-gallon tank, and it’s been excellent so far. The built-in thermostat keeps the water right around 78°F, and the temperature stays steady day and night without needing to adjust anything. I checked it against a thermometer and it’s always within about a degree. Installation was easy — just stick it to the glass with the suction cups and plug it in. The size is perfect for a small tank; it tucks neatly behind a plant and doesn’t get in the way. The indicator light is a nice touch so you know when it’s heating. For a small setup like a 5-gallon betta or shrimp tank, this heater is exactly what you need: simple, quiet, and dependable. Great value for the price.

### ⭐⭐⭐⭐⭐ Steady heat without the guesswork
*by E***S on December 28, 2025*

So far this heater is working great. Keeps my 20 gallon tank at a steady 78° without having to mess with a finicky dial. You don't have to remember which way to turn the dial taking all the guess work out. It's small size takes up less room as well.

## Frequently Bought Together

- Tetra 26446 HT Submersible Aquarium Heater With Electronic Thermostat, 100-Watt, Multicolor, 10-30 Gallon
- PAIZOO Fish Tank Digital Thermometer Accurate LED Display to ±0.9°F Tank Thermometer Aquarium Temperature Measurement Suitable for Fish, Axolotl, Turtle or Aquatic
- Tetra Water Cleaner Gravel Siphon for Aquariums, Easily Clean Freshwater Aquariums

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-12*