---
product_id: 679236577
title: "FREESEA Aquarium Heater for Fish Tank: 100W/200W/300W/500W Submersible Fish Tank Heater with Over-Temperature and Off-Water Protection for 20-40 Gallon Saltwater and Freshwater"
brand: "freesea"
price: "€ 54.73"
currency: EUR
in_stock: true
url: https://www.desertcart.sk/products/679236577-freesea-aquarium-heater-for-fish-tank-100w-200w-300w-500w
store_origin: SK
region: Slovakia
---

# Digital LED temp control 200W rapid heating Overheat & off-water auto shutoff FREESEA Aquarium Heater for Fish Tank: 100W/200W/300W/500W Submersible Fish Tank Heater with Over-Temperature and Off-Water Protection for 20-40 Gallon Saltwater and Freshwater

**Brand:** freesea
**Price:** € 54.73
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** FREESEA Aquarium Heater for Fish Tank: 100W/200W/300W/500W Submersible Fish Tank Heater with Over-Temperature and Off-Water Protection for 20-40 Gallon Saltwater and Freshwater by freesea
- **How much does it cost?** € 54.73 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/679236577-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

- • **Safety-First Design:** Multi-layer protection automatically powers down to prevent overheating or dry operation—no more boiled fish fears.
- • **Versatile Compatibility:** Perfectly sized for 20-40 gallon freshwater and saltwater tanks, with multiple wattage options to fit your setup.
- • **Complete Ready-to-Use Kit:** Includes heater, controller, suction cups, thermometer strip, and a 12-month warranty for total peace of mind.
- • **Durable Explosion-Proof Build:** Crafted from quartz glass and nickel-chromium wire for fast, reliable heating and long-lasting aquarium safety.
- • **Precision Temperature Control:** Set and monitor your aquarium’s climate with ±1°F accuracy via an intuitive LED controller.

## Overview

The FREESEA Aquarium Heater is a submersible, explosion-proof quartz glass heater available in 100W to 500W options, designed for 20-40 gallon freshwater and saltwater tanks. Featuring precise digital temperature control, automatic overheat and off-water shutoff protections, and a durable build, it ensures safe, efficient, and reliable heating for your aquatic environment. Comes as a complete kit with a 12-month warranty.

## Description

FREESEA Aquarium Heater for Fish Tank: 100W/200W/300W/500W Submersible Fish Tank Heater with Over-Temperature and Off-Water Protection for 20-40 Gallon Saltwater and Freshwater

## Features

- 【200 Watts Aquarium Heater】: This 100W aquarium heater is ideal for 20 to 40-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.
- 【Fully Equipped with Warranty】: This aquarium heater has everything you need: 1 heater, 1 controller, 2 suction cups, 1 complimentary thermometer strip, and 1 instruction manual. It also includes a 12-month warranty for your peace of mind.

## Images

![FREESEA Aquarium Heater for Fish Tank: 100W/200W/300W/500W Submersible Fish Tank Heater with Over-Temperature and Off-Water Protection for 20-40 Gallon Saltwater and Freshwater - Image 1](https://m.media-amazon.com/images/I/617Fr+1xXKL.jpg)

## Available Options

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

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**Shop now:** [https://www.desertcart.sk/products/679236577-freesea-aquarium-heater-for-fish-tank-100w-200w-300w-500w](https://www.desertcart.sk/products/679236577-freesea-aquarium-heater-for-fish-tank-100w-200w-300w-500w)

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-01-29*