---
product_id: 52830982
title: "FREESEA Aquarium Fish Tank Heater: 50W Small Submersible Turtle Heater with Adjustable Temperature External Controller for Betta | Saltwater | Freshwater | 1-10 Gallon"
brand: "freesea"
price: "€ 38.99"
currency: EUR
in_stock: true
reviews_count: 8
category: "Freesea"
url: https://www.desertcart.hr/products/52830982-freesea-aquarium-fish-tank-heater-50w-small-submersible-turtle-heater
store_origin: HR
region: Croatia
---

# 50W power for rapid heating LED display with real-time temp & error codes Adjustable 63℉-94℉ external controller FREESEA Aquarium Fish Tank Heater: 50W Small Submersible Turtle Heater with Adjustable Temperature External Controller for Betta | Saltwater | Freshwater | 1-10 Gallon

**Brand:** freesea
**Price:** € 38.99
**Availability:** ✅ In Stock

## Summary

> 🌊 Keep your aquatic world perfectly cozy — because your betta deserves the best!

## Quick Answers

- **What is this?** FREESEA Aquarium Fish Tank Heater: 50W Small Submersible Turtle Heater with Adjustable Temperature External Controller for Betta | Saltwater | Freshwater | 1-10 Gallon by freesea
- **How much does it cost?** € 38.99 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/52830982-freesea-aquarium-fish-tank-heater-50w-small-submersible-turtle-heater)

## 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

- • **Long Reach Power Cord:** 5ft cord offers flexible placement options, perfect for office or home setups with varied tank locations.
- • **Safety-First Auto Shutoff:** Dual protection auto-shuts heater when exposed or overheated, ensuring peace of mind for your aquatic friends.
- • **Compact & Submersible Design:** Sleek 3.5-inch glass heater fits discreetly in 1-10 gallon tanks without disrupting your aquarium’s aesthetic.
- • **Precision Temperature Control:** Easily set and monitor your tank’s climate with an external digital controller for perfect aquatic comfort.
- • **Trusted Brand with 24/7 Support:** Backed by FREESEA’s decade-long expertise and responsive customer service, join thousands of satisfied aquarium pros.

## Overview

The FREESEA 50W Aquarium Fish Tank Heater is a compact, submersible glass heater designed for 1-10 gallon freshwater and saltwater tanks. Featuring an external digital controller with LED temperature display, it offers precise temperature adjustment from 63℉ to 94℉. Dual safety auto shutoff protects your aquatic pets by stopping heating if the heater is exposed or overheats. With a 5ft power cord and stable operation, it’s ideal for office or home aquariums, supported by FREESEA’s professional after-sales service and over a decade of industry expertise.

## Description

FREESEA is always dedicated to innovate and optimize our products and has a professional after-sales team. We are committed to bring high-quality and stable aquarium supplies and the best after-sales service for each aquarium enthusiast. FREESEA is the most professional aquarium shop you can trust. Click to know more World-renowned brand, industry benchmark Professional indoor and outdoor aquarium manufacturer World-renowned brand, industry benchmark Professional indoor and outdoor aquarium manufacturer How did we get our start? The FREESEA team was started in 2005. We have been in the field of aquarium for more than ten years with the most professional team and first-class after-sales service. What makes our products unique? We have our own R&D team and factory. Each product is independently developed and designed by our team, and has applied for a patent, which is unique in the market. What problem are we solving? FREESEA products are rigorously tested and used for a long time before being available in bulk. We focus on providing quality products and services. How did we get our start? The FREESEA team was started in 2005. We have been in the field of aquarium for more than ten years with the most professional team and first-class after-sales service. What makes our products unique? We have our own R&D team and factory. Each product is independently developed and designed by our team, and has applied for a patent, which is unique in the market. What problem are we solving? FREESEA products are rigorously tested and used for a long time before being available in bulk. We focus on providing quality products and services.

Review: Great little heater. - Heater works well and is very efficient. I have a 5gal Betta tank with some live plants and betta in it. Its an office tank and set up with plants that would tolerate not being heated. Since setting up the tank I moved into a new position and part of new my office is exposed brick walI, which makes it harder to maintain the temperature. I was looking for something smaller since my tank is small and prefer submerging heaters. I also didn't want to spend a ton of money on it if possible. Since adding this I have noticed my betta is more active and the plants are growing much quicker. Temperature rises quickly to setting and maintains steadily with no adjusting from me. The only negative I would have would be that every 3 or 4 days the thing the sections cups release and I have to stick it to the side of the tank again. However my tank is round and I'm unsure if this is playing into the issue. Instead of having to worry about it coming free and floating to the top of the water I was able to add a small binder clip to the top of the cord which keeps it down in the water if it releases. Again I am unsure if it is due to my tank being round and not flat. Overall this is a great little heater for a small tank!
Review: Favorite heater so far - I've got 3 heaters I've tried and this one is my favorite. It is small and not in the way, even in the 5 gallon I have. My betta (Mario) actually loves to be near it and it doesn't cook his very long flowy fins. I love that I can set the temperature outside of the tank and then be able to look over at any point of the room and easily see the digital number very clearly. Some people might want one more "hidden" read out, but it makes me feel more secure that the thermometer is doing its job. It may actually suction too well. Once a month or as needed, I try to take it out for cleaning. I always have to battle the bottom suction cup. But again, I feel good that it's so secure and won't move and squish Mario or my snail (Tony). I have it set at 79 and have noticed it goes between 78 and 81 frequently throughout the day. But that doesn't seem to bother Mario or Tony so I don't mind either. I've had this for 3-4 months now and will update if anything should go wrong but I'm thinking of getting another one for my 15 gallon with my other Betta (Angelo) and several snails. That heater will not be named but its supposed to be stronger and its just not working out.

## Features

- FREESEA Aquarium Heater: 50w betta fish heater, voltage: 110~120V, is suitable for use in 1-10 gal betta fish turtle tanks and aquariums. The power cord is 5ft, long enough for indoor use
- Double Safety Protection: When the top part of the turtle tank heater is out of water it will auto shut off. When the actual water temperature is higher than 94°F, it will auto activate the overheating protection and stop heating
- External Controller: The betta fish heater is adjusted by an external controller, which you can mount on the outside edge of the tank. It’s convenient to adjust temperature that range from 63℉ to 94℉
- LED Temperature Display: Digital led temperature display shows the real-time temperature and error code on the screen. When the mini aquarium heater is heating, there indicator light above the digit is on red
- 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 | B075PSPCNY |
| Best Sellers Rank | #41,604 in Pet Supplies ( See Top 100 in Pet Supplies ) #80 in Aquarium Heaters |
| Brand | FREESEA |
| Brand Name | FREESEA |
| Color | Submersible Heater with External Controller |
| Customer Reviews | 4.3 out of 5 stars 7,498 Reviews |
| Item Length | 3.5 Inches |
| Manufacturer | FREESEA |
| Material | Glass |
| Material Type | Glass |
| Model Number | FS28-50W |
| Part Number | 4334822537 |
| UPC | 722970219243 |
| Unit Count | 1 Count |
| Voltage | 110 Volts |
| Wattage | 50 watts |

## Product Details

- **Brand:** FREESEA
- **Color:** Submersible Heater with External Controller
- **Item Length:** 3.5 Inches
- **Material:** Glass
- **Voltage:** 110 Volts

## Images

![FREESEA Aquarium Fish Tank Heater: 50W Small Submersible Turtle Heater with Adjustable Temperature External Controller for Betta | Saltwater | Freshwater | 1-10 Gallon - Image 1](https://m.media-amazon.com/images/I/716knQX-94L.jpg)

## Available Options

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

## Questions & Answers

**Q: No directions came with my heater....How can I adjust the temp so that it actually sticks?**
A: Use the Button by the outlet side and then press it, it will start to flash press until your at the proper temp then leave it. It will adjust itself

**Q: Can i adjust it to set to 78 degrees F for a betta fish?**
A: Dear customer, 78 ℉ is ≈ 26℃ , designed temperature for this heater is 15~34℃，normally, suitable temperature for betta fish is 24~30℃（75~86℉）, we suggest you ask local fish store for more details.

**Q: What type of plastic is it made of?**
A: The Plastic is durable, does no appear to be fiberglass filed plastic. How ever the one I purchased is sitting in a box it didn't last much more than a month. an alert message flashed and I removed it as soon as I noticed it. Replaced it with a Cobalt Neo-Therm Heater.

**Q: Why is this Heater flashing 00?  Tried unplugging and resetting- still does not work.**
A: It flashes till you set the temp you want then it stops. If it keeps flashing then you need to contact seller and send it back.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great little heater.
*by D***E on December 3, 2020*

Heater works well and is very efficient. I have a 5gal Betta tank with some live plants and betta in it. Its an office tank and set up with plants that would tolerate not being heated. Since setting up the tank I moved into a new position and part of new my office is exposed brick walI, which makes it harder to maintain the temperature. I was looking for something smaller since my tank is small and prefer submerging heaters. I also didn't want to spend a ton of money on it if possible. Since adding this I have noticed my betta is more active and the plants are growing much quicker. Temperature rises quickly to setting and maintains steadily with no adjusting from me. The only negative I would have would be that every 3 or 4 days the thing the sections cups release and I have to stick it to the side of the tank again. However my tank is round and I'm unsure if this is playing into the issue. Instead of having to worry about it coming free and floating to the top of the water I was able to add a small binder clip to the top of the cord which keeps it down in the water if it releases. Again I am unsure if it is due to my tank being round and not flat. Overall this is a great little heater for a small tank!

### ⭐⭐⭐⭐⭐ Favorite heater so far
*by H***D on July 7, 2019*

I've got 3 heaters I've tried and this one is my favorite. It is small and not in the way, even in the 5 gallon I have. My betta (Mario) actually loves to be near it and it doesn't cook his very long flowy fins. I love that I can set the temperature outside of the tank and then be able to look over at any point of the room and easily see the digital number very clearly. Some people might want one more "hidden" read out, but it makes me feel more secure that the thermometer is doing its job. It may actually suction too well. Once a month or as needed, I try to take it out for cleaning. I always have to battle the bottom suction cup. But again, I feel good that it's so secure and won't move and squish Mario or my snail (Tony). I have it set at 79 and have noticed it goes between 78 and 81 frequently throughout the day. But that doesn't seem to bother Mario or Tony so I don't mind either. I've had this for 3-4 months now and will update if anything should go wrong but I'm thinking of getting another one for my 15 gallon with my other Betta (Angelo) and several snails. That heater will not be named but its supposed to be stronger and its just not working out.

### ⭐⭐⭐⭐ Great heater
*by R***N on January 21, 2026*

This product works well. It’s small and heated the water quickly and keeps the temp. I am using the heater for a turtle habitat.

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-07-07*