---
product_id: 202488709
title: "DaToo 20 Watt Small Aquarium Heater Mini Betta Flat Fish Tank Heater for 2 Gallon 3 Gallon"
brand: "datoo"
price: "₩43939"
currency: KRW
in_stock: true
reviews_count: 8
category: "Da Too"
url: https://www.desertcart.kr/products/202488709-datoo-20-watt-small-aquarium-heater-mini-betta-flat-fish
store_origin: KR
region: South Korea
---

# 20W power for efficient heating 24V safe voltage with auto shutoff Maintains 75°F-82°F constant temp DaToo 20 Watt Small Aquarium Heater Mini Betta Flat Fish Tank Heater for 2 Gallon 3 Gallon

**Brand:** datoo
**Price:** ₩43939
**Availability:** ✅ In Stock

## Summary

> 🐠 Keep your Betta cozy & safe with DaToo’s sleek mini heater!

## Quick Answers

- **What is this?** DaToo 20 Watt Small Aquarium Heater Mini Betta Flat Fish Tank Heater for 2 Gallon 3 Gallon by datoo
- **How much does it cost?** ₩43939 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/202488709-datoo-20-watt-small-aquarium-heater-mini-betta-flat-fish)

## Best For

- datoo enthusiasts

## Why This Product

- Trusted datoo brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Safety First, Always:** Low-voltage 24V power plus automatic shutoff when out of water protects both your fish and family from hazards.
- • **Mini Marvel for Small Tanks:** Ultra-compact 3x2x0.26 inch design fits perfectly in 2-3 gallon tanks without cramping your Betta's space.
- • **Confidence in Every Purchase:** Backed by a 1-year warranty and 24/7 customer support, DaToo is your trusted partner in aquatic care.
- • **Plug & Play Temperature Control:** Automatically keeps water between 75°F and 82°F—no manual adjustments needed, so your fish stay comfy effortlessly.
- • **PTC Heating Tech for Speed & Safety:** Advanced PTC heating ensures rapid, even warmth without risk of explosion or cracking—eco-friendly and energy efficient.

## Overview

The DaToo 20W Mini Aquarium Heater is a compact, energy-efficient heating solution designed specifically for 2-3 gallon freshwater tanks. Featuring automatic temperature regulation between 75°F and 82°F, a safe 24V power supply with auto shutoff when removed from water, and durable PTC heating technology, it ensures optimal conditions for tropical fish like Bettas. Its slim profile maximizes tank space, while a 1-year warranty and responsive customer service provide peace of mind.

## Description

The Best Mini Aquarium Heater 20W For Your KidsFeature- Power: 20 Watt- Output Voltage: DC 24V - Size: 3*2*0.26 inch- Fit 2~3 gallon small tank- Temperature constant at 75°F to 82°F(Depending on the external environment), No need to set.- Only for fresh water tanks- Power Off After Leaving Water (Heating indicator shows green)- A Wireless Waterproof ThermometerWhy Do I Select 20Watt DaToo Mini Aquarium Heater?1. Super Small and Thin size, more suitable for 2~3 gallon small tank, perfectly hidden in your samll tank.2. 24V Safe Voltage and Power Off After Leaving Water, not afraid of electric leakage and dry burning, ideal for your kids.3. PTC Heating, faster heating and better thermal conductivity, no explosion, no cracking, energy saving and environmental protection.4. One Year Warranty and 24 Hours Professional Customer Service. Buy DaToo products with confidence.Select DaToo Products= Own A Private Aquarium Housekeeper.JUST DO IT, Let’t Go!!

Review: Great product, just missed giving thermometer - This is a great product, easily kept my fish tank at 80 degrees Fahrenheit and had no problems. The only issue is that it is missing the thermometer it promised would be included. Other than that, this product is amazing for small tanks like 1 gal and higher.
Review: Do not buy for betta fish. Killed 2 of my poor babies - This unit is supposed to automatically adjust to conditions and keep the tank in the happy zone for betta and other tropical fish, but it DOES NOT WORK as advertized. It works well in cold rooms to keep the temperature warm in the tank, but if your room heats up, the unit continues to provide additional heat, cooking your fish in the tank. I am so angry at myself for not noticing the signs earlier. For the record, my room never got above 75-80 degrees Fahrenheit, but looking at the temperature in the tank, it's currently 88 degrees. If you have some other low intensity heat application you need this for outside of fish care, it may suit your needs, but if you value the well-being of your bettas, keep well away from this murder device.

## Features

- PERFECT MINI HEATER FOR 2~3 GALLON TANK - For a Betta breeder with a 2 to 3 gallon small tank, it is very difficult to choose a suitable heater. Because most of the heaters on the market are too big for this small tank. This not only affects us to watch our beautiful Betta, but also reduces the activity space of the Betta. Now DaToo Mini Aquarium heater can help you solve this problem. Ultra-small and thin size, perfectly hidden in a 2~3 gallon tank, your Betta will be happy with it! !
- CONSTANT TEMPERATURE & NO NEED TO ADJUST - DaToo 20W MINI Aquarium Heater can automatically maintain a constant temperature between 75°F and 82°F (depending on the external environment), no need to set. This temperature range is ideal for most tropical fish and is very beneficial for the reproduction of betta and promotes their metabolism. With no extra work, just plug it in and the DaToo 20Watt Small Fish Tank Heater will help your fish stay healthy and comfortable. Great for kids!!
- 24V SAFE VOLTAGE & POWER OFF AFTER LEAVING WATER - The output voltage of the DaToo Betta Heater is only 24V, which not only ensures the safety of the fish, but also ensures the safety of the user. No need to worry about leakage, you can rest assured to use it for your children. The Betta heater needs to be completely submerged in the water. If it leaves the water, it will automatically stop heating to prevent dry burning (heating indicator is green), which is very safe.
- PTC HEATING & ONLY SUITABLE FOR FRESHWATER - Unlike conventional glass aquarium heaters, PTC has better thermal conductivity and heating rate, no explosion, no breakage. Very energy efficient and environmentally friendly. Your child can operate it easily and is very safe. This mini fish tank heater is only suitable for fresh water tanks.
- ATTENTION & ONE YEAR WARRANTY - This is 20W MINI Aquarium Heater, size is 3*2*0.26 inch, fit 2~3 gallon small tank. Only for fresh water tanks. One Year Warranty and 24 Hours Professional Customer Service. Buy DaToo products with confidence. JUST DO IT, Let’t Go!!

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | DaToo |
| Customer Reviews | 3.8 out of 5 stars 88 Reviews |
| Finish Type | Unfinished |
| Material | Glass |
| Power Source | Corded Electric |
| Shade Material | Glass |
| Shape | Rectangular |

## Product Details

- **Shape:** Rectangular
- **Material:** Glass
- **Finish Type:** Unfinished
- **Shade Material:** Glass
- **Power Source:** Corded Electric

## Images

![DaToo 20 Watt Small Aquarium Heater Mini Betta Flat Fish Tank Heater for 2 Gallon 3 Gallon - Image 1](https://m.media-amazon.com/images/I/610dnw3x3TL.jpg)
![DaToo 20 Watt Small Aquarium Heater Mini Betta Flat Fish Tank Heater for 2 Gallon 3 Gallon - Image 2](https://m.media-amazon.com/images/I/616dvSse1kL.jpg)
![DaToo 20 Watt Small Aquarium Heater Mini Betta Flat Fish Tank Heater for 2 Gallon 3 Gallon - Image 3](https://m.media-amazon.com/images/I/61LeYZ2AmAL.jpg)
![DaToo 20 Watt Small Aquarium Heater Mini Betta Flat Fish Tank Heater for 2 Gallon 3 Gallon - Image 4](https://m.media-amazon.com/images/I/61N0-ouS5fL.jpg)
![DaToo 20 Watt Small Aquarium Heater Mini Betta Flat Fish Tank Heater for 2 Gallon 3 Gallon - Image 5](https://m.media-amazon.com/images/I/61eodQ-Ha5L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great product, just missed giving thermometer
*by C***S on October 27, 2021*

This is a great product, easily kept my fish tank at 80 degrees Fahrenheit and had no problems. The only issue is that it is missing the thermometer it promised would be included. Other than that, this product is amazing for small tanks like 1 gal and higher.

### ⭐ Do not buy for betta fish. Killed 2 of my poor babies
*by Y***A on November 2, 2023*

This unit is supposed to automatically adjust to conditions and keep the tank in the happy zone for betta and other tropical fish, but it DOES NOT WORK as advertized. It works well in cold rooms to keep the temperature warm in the tank, but if your room heats up, the unit continues to provide additional heat, cooking your fish in the tank. I am so angry at myself for not noticing the signs earlier. For the record, my room never got above 75-80 degrees Fahrenheit, but looking at the temperature in the tank, it's currently 88 degrees. If you have some other low intensity heat application you need this for outside of fish care, it may suit your needs, but if you value the well-being of your bettas, keep well away from this murder device.

### ⭐⭐⭐⭐⭐ Works Great!
*by K***M on January 19, 2022*

Our 3 gallon tank stays about 82 degrees in an old drafty house where the thermostat is set somewhere between 64 and 68 all winter. Our betta is delighted! I imagine that I'll need to switch out heaters come summer/fall when we keep it warmer in the house, but I'm pleased enough with this one that I'll stick to the same brand/type.

## Frequently Bought Together

- DaToo 20 Watt Small Aquarium Heater Mini Betta Flat Fish Tank Heater for 2 Gallon 3 Gallon
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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-01-25*