---
product_id: 680659015
title: "FREESEA Aquarium Heater for Fish Tank: 100W/200W/300W/500W Submersible Fish Tank Heaters with Over-Temperature and Off-Water Protection for 10-20 Gallon Saltwater and Freshwater"
brand: "freesea"
price: "R759"
currency: ZAR
in_stock: true
reviews_count: 8
category: "Freesea"
url: https://www.desertcart.co.za/products/680659015-freesea-aquarium-heater-for-fish-tank-100w-200w-300w-500w
store_origin: ZA
region: South Africa
---

# Digital LED precise temp control ±1°F 100W rapid heating power Multi-layer safety: overheat & off-water auto shutoff FREESEA Aquarium Heater for Fish Tank: 100W/200W/300W/500W Submersible Fish Tank Heaters with Over-Temperature and Off-Water Protection for 10-20 Gallon Saltwater and Freshwater

**Brand:** freesea
**Price:** R759
**Availability:** ✅ In Stock

## Summary

> 🔥 Keep your aquatic world perfectly heated — because your fish deserve the best!

## Quick Answers

- **What is this?** FREESEA Aquarium Heater for Fish Tank: 100W/200W/300W/500W Submersible Fish Tank Heaters with Over-Temperature and Off-Water Protection for 10-20 Gallon Saltwater and Freshwater by freesea
- **How much does it cost?** R759 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/680659015-freesea-aquarium-heater-for-fish-tank-100w-200w-300w-500w)

## Best For

- freesea enthusiasts

## Why This Product

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

## Key Features

- • **Plug & Play Convenience:** Easy installation with included suction cups and a 6.6-foot power cord—just set your temp and enjoy a stable, cozy tank climate.
- • **Versatile Wattage Options:** Choose from 100W to 500W models tailored for tanks between 10 to 55 gallons, perfect for both saltwater and freshwater setups.
- • **Durable Quartz Glass Build:** Explosion-proof quartz glass and nickel-chromium heating wire deliver fast, reliable heating with long-lasting durability.
- • **Precision Temperature Mastery:** Set and monitor your tank’s climate effortlessly with an intuitive LED controller, ensuring a perfect aquatic environment every time.
- • **Safety-First Smart Protection:** Automatic shutoff guards against overheating and dry operation, giving your aquatic friends a worry-free habitat.

## Overview

The FREESEA Aquarium Heater is a submersible, explosion-proof quartz glass heater available in multiple wattages (100W-500W) designed for 10-55 gallon freshwater and saltwater tanks. Featuring a digital LED controller with ±1°F accuracy, it offers precise temperature adjustments from 64℉ to 95℉. Its smart safety system automatically shuts off to prevent overheating or dry operation, ensuring maximum protection for your aquatic life. With durable construction and easy installation, it’s a reliable, professional-grade solution for maintaining optimal tank temperature.

## Description

desertcart.com: FREESEA Aquarium Heater for Fish Tank: 100W/200W/300W/500W Submersible Fish Tank Heaters with Over-Temperature and Off-Water Protection for 10-20 Gallon Saltwater and Freshwater : Pet Supplies

Review: The best heater! - I was looking for a good heater for my 5.9 gallon long tank. I eventually went through some cheaper ones before figuring out they were just not going to work. I am highly impressed with this heater, it has all of the features needed to make the perfect heater. Theirs a little thermometer bank attached that allows you to tune the temperature up or down. It also detects what temperature it is in the tank and the two are always matching. My tank is always a solid 80 and is perfect for my betta fish! I will say the suctions on the back do not hold very well however the quality of the heater itself is high quality! All you have to do is put it in your tank, plug it in, an adjust the temperature to how you want it.
Review: Turtle Tank Heater - I purchased this water heater for my turtle tank! My tank is 55 gallons and it works super well to keep the water temp up.

## Features

- 【100 Watts Aquarium Heater】: This 100W aquarium heater is ideal for 10 to 20-gallon saltwater or freshwater aquariums. It measures 8.3 inches in length, operates on 110-120V, and comes with a 6.6-foot power cord. Please refer to our size chart to choose the correct wattage for your aquarium.
- 【Overheating & Off-Water Protection】: The heater automatically shuts off and stops heating when the water temperature exceeds the preset level or if it becomes exposed to air. It will display an error code until the temperature drops below the preset limit or the heater is fully submerged again. Error codes: E1 – out of water; E2 – mechanical failure. This multi-layer protection ensures you never have to worry about "boiled fish"!
- 【Digital LED Controller】: Adjustable temperature range: 64℉-95℉, with an accuracy of ±1°F, you can easily adjust the temperature using the external controller without touching the water. The LED screen displays the current water temperature, preset temperature, and an auto shut-off warning. It's simple and user-friendly!
- 【Explosion-Proof Quartz Glass Aquarium Heater】: Made from explosion-proof quartz glass, this submersible heater utilizes high-temperature-resistant nickel-chromium heating wire and quartz sand for efficient heat conduction, providing rapid water heating and long-lasting performance. The durable black housing, crafted from PC material, offers superior heat resistance to regular ABS, protecting your fish, aquatic life, and yourself from burns.
- 【Excellent Service】: The Heater of the FREESEA operate very stably under Fish Tank. If you have any questions about the Heater you received, please feel free to contact us at any time. 24-Hour Professional After-Sales Service

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0DK1PN585 |
| ASIN  | B0DK1PN585 |
| Best Sellers Rank | #18,933 in Pet Supplies ( See Top 100 in Pet Supplies ) #50 in Aquarium Heaters |
| Brand Name | FREESEA |
| Color | Black |
| Customer Reviews | 4.4 4.4 out of 5 stars (307) |
| Date First Available | October 14, 2024 |
| Date First Available  | October 14, 2024 |
| Directions | Adults 18 years and older. |
| Included Components | 1 Thermometer Sticker, 2 suction cups, Digital Display Controller |
| Item Dimensions LxWxH | 8.3 x 1.6 x 1.2 inches |
| Item Package Dimensions L x W x H | 9.02 x 4.25 x 2.01 inches |
| Item Weight | 14.9 ounces |
| Item model number | FS-100E |
| Item model number  | FS-100E |
| Manufacturer | FREESEA |
| Manufacturer  | FREESEA |
| Model Name | FS-100E |
| Number of Items | 1 |
| Product Dimensions  | 8.3 x 1.6 x 1.2 inches; 14.89 ounces |
| Size | 100W(10-20gallon) |
| Specific Uses for Product | heating fish tank |
| Target Audience Keyword | Fish |
| Warranty Description | 1 Year Warranty |

## Images

![FREESEA Aquarium Heater for Fish Tank: 100W/200W/300W/500W Submersible Fish Tank Heaters with Over-Temperature and Off-Water Protection for 10-20 Gallon Saltwater and Freshwater - Image 1](https://m.media-amazon.com/images/I/617Fr+1xXKL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ The best heater!
*by C***G on September 9, 2025*

I was looking for a good heater for my 5.9 gallon long tank. I eventually went through some cheaper ones before figuring out they were just not going to work. I am highly impressed with this heater, it has all of the features needed to make the perfect heater. Theirs a little thermometer bank attached that allows you to tune the temperature up or down. It also detects what temperature it is in the tank and the two are always matching. My tank is always a solid 80 and is perfect for my betta fish! I will say the suctions on the back do not hold very well however the quality of the heater itself is high quality! All you have to do is put it in your tank, plug it in, an adjust the temperature to how you want it.

### ⭐⭐⭐⭐⭐ Turtle Tank Heater
*by O***A on December 30, 2025*

I purchased this water heater for my turtle tank! My tank is 55 gallons and it works super well to keep the water temp up.

### ⭐⭐⭐⭐⭐ Perfect fit!
*by D***5 on December 27, 2025*

Quality product. Fit perfectly.

## Frequently Bought Together

- FREESEA Aquarium Heater for Fish Tank: 100W/200W/300W/500W Submersible Fish Tank Heaters with Over-Temperature and Off-Water Protection for 10-20 Gallon Saltwater and Freshwater
- PAIZOO Fish Tank Digital Thermometer Accurate LED Display to ±0.9°F Tank Thermometer Aquarium Temperature Measurement Suitable for Fish, Axolotl, Turtle or Aquatic
- API FRESHWATER MASTER TEST KIT 800-Test Freshwater Aquarium Water Master Test Kit, White, Single, Multi-colored

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-02-13*