---
product_id: 4160081
title: "Fluval M 50-Watt Submersible Aquarium Heater for Fresh & Saltwater Tanks"
brand: "fluval"
price: "56982CFA"
currency: XOF
in_stock: true
reviews_count: 13
category: "Fluval"
url: https://www.desertcart.sn/products/4160081-fluval-m-50-watt-submersible-aquarium-heater-for-fresh-saltwater
store_origin: SN
region: Senegal
---

# Shock-resistant borosilicate glass Reflective mirror tech 50W precise heating Fluval M 50-Watt Submersible Aquarium Heater for Fresh & Saltwater Tanks

**Brand:** fluval
**Price:** 56982CFA
**Availability:** ✅ In Stock

## Summary

> 🌊 Keep your tank cozy and chic with invisible, precision warmth!

## Quick Answers

- **What is this?** Fluval M 50-Watt Submersible Aquarium Heater for Fresh & Saltwater Tanks by fluval
- **How much does it cost?** 56982CFA with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/4160081-fluval-m-50-watt-submersible-aquarium-heater-for-fresh-saltwater)

## Best For

- fluval enthusiasts

## Why This Product

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

## Key Features

- • **Built to Last:** Durable borosilicate glass and ceramic heat sink deliver safe, even warmth with long-lasting reliability.
- • **Invisible Heat:** Reflective mirror technology blends the heater seamlessly into your tank’s natural vibe—no eyesores here.
- • **Sleek & Discreet:** Slim profile design installs effortlessly, maximizing your tank’s visual appeal without clutter.
- • **Precision Perfect:** Computer-calibrated thermostat ensures rock-solid temperature control for your aquatic ecosystem.
- • **Tailored for Small Tanks:** Optimized 50-watt power for freshwater and saltwater tanks up to 15 gallons—perfect for your compact aquatic sanctuary.

## Overview

The Fluval M 50-Watt Submersible Aquarium Heater offers precise, computer-calibrated temperature control with a user-friendly dial, ideal for freshwater and saltwater tanks up to 15 gallons. Its reflective mirror technology camouflages the heater within your aquarium, while durable borosilicate glass and a ceramic heat sink ensure safe, even heating. Compact and easy to install, this heater maintains a stable aquatic environment, promoting healthy fish and plants with reliable, efficient warmth.

## Description

Ensure a stable and comfortable aquatic environment with the Fluval M 50-Watt Submersible Aquarium Heater—a premium heating solution designed for aquariums up to 15 gallons. This heater features computer-calibrated thermostat technology for precise temperature control, while the easy-to-adjust dial allows for effortless customization. Made with shock-resistant Borosilicate glass and a high-density ceramic heat sink, it ensures even heat distribution and durability. The built-in reflective mirror technology blends into your aquarium, mirroring the surrounding colors for an unobtrusive look. Designed for both freshwater and saltwater tanks, this compact and easy-to-install heater provides reliable, efficient heating to maintain an ideal environment for your aquatic life.

Review: Great product!!! - I love this heater. I have been using it in my betta's tank for about a year, and so far, it has worked very well! This heater is not made for being completely submerged under water. The black and grey part (the part above the little wavy marks) must be above water, along with the cord. I put this heater right next to my filter so that the filter motor can move the warmed water around the aquarium evenly. This heater is, of course, automatic. It has a thermostat somewhere in it that tells it to turn on when the water is too cool and turn off when the water gets warm enough. When the heater is warming your tank water, there will be a blue light on the side, and when it turns on and off, it will make a clicking sound and the light will turn on or off. This is a very good heater for my five-gallon tank. I have it set at about 81 degrees, and it keeps my tank at a steady 78 or 79 degrees Fahrenheit (which is the perfect temperature for betta fish). I am very impressed!
Review: Works fine - So I went through and looked at all the 50W's heater reviews and only about two of maybe twelve were negative or lower than four, so I went for it and bought it. I tend to go for ViaAqua, and for most all my tanks have their glass heaters (in 50W and 200W). I didn't for this tank in part because the price went up for the ViaAqua heater I normally get for 5g tanks, and I splurged and got the Fluval Chi and figured I may as well keep with all one brand for this tank. I don't think it has to go on very much, save for maybe at night, but in winter I'm sure it will be used much more. It is an attractive heater, I suppose - looks nice in the tank for a heater. It isn't really invisible, though it isn't as visible as some people said it was. I never needed it to blend in with the tank, so I didn't really care if it was or wasn't visible. I think because I have a Fluval tank it is less visible (they are really reflective, I guess, so if you don't have plants that go too high in it, then I think it probably blends in better). If I have any issues with it, I'll edit this, but I think because it is a fairly low power heater, it won't be too much of a problem. A lot of the negative reviews this product got was for a different size (the 300W and 200W ones, I think).

## Features

- Precision Temperature Control: The Fluval M 50-Watt Submersible Heater features a computer-calibrated thermostat for consistent, accurate heating. The easy-to-adjust temperature control dial ensures a stable aquatic environment for your fish and plants
- Reflective Mirror Technology: Designed to seamlessly blend into your aquarium, this heater uses built-in reflective technology that mirrors surrounding colors, making it virtually invisible while maintaining tank aesthetics
- Durable & Safe Materials: Constructed with shock-resistant Borosilicate glass and a high-density ceramic heat sink, this heater is built to withstand aquatic conditions while ensuring even heat distribution for a safe and efficient heating solution
- Slim & Easy to Install: The Fluval M Series heater features a slim profile tube, making it simple to install and position discreetly in your aquarium. Its compact design ensures minimal space usage, allowing for an unobstructed tank view
- Ideal for Small Aquariums: With a 50-watt power rating, this submersible heater is perfect for freshwater and saltwater aquariums up to 15 gallons. Keep your aquatic environment warm and stable for healthy, thriving fish and plants

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0027VMPXA |
| Best Sellers Rank | #8,875 in Pet Supplies ( See Top 100 in Pet Supplies ) #14 in Aquarium Heaters |
| Brand | Fluval |
| Brand Name | Fluval |
| Color | Silver |
| Customer Reviews | 4.5 out of 5 stars 2,435 Reviews |
| Global Trade Identification Number | 00015561107815 |
| Included Components | Fluval M50 Submersible Glass Aquarium Heater (50 watts) |
| Item Type Name | Submersible Heater |
| Item Weight | 9.92 ounces |
| Manufacturer | Rolf C. Hagen (USA) Corp. |
| Material | Ceramic, borosilicate glass |
| Material Type | Ceramic, borosilicate glass |
| Model Number | M50 |
| Part Number | A781 |
| UPC | 015561107815 |
| Unit Count | 1 Count |
| Warranty Description | 3 years; The Fluval M series Submersible Aquarium Heater is guaranteed for defective parts and workmanship for a period of 3 year. We reserve the right to repair or replace, at our option. This guarantee excludes damage, breakage of the glass tube or injuries resulting from negligence or other misuse. This warranty does not include responsibility for animate or inanimate matter contained in the aq… |
| Wattage | 50 watts |

## Product Details

- **Brand:** Fluval
- **Color:** Silver
- **Item Weight:** 0.62 Pounds
- **Material:** Ceramic, borosilicate glass
- **Wattage:** 50 watts

## Images

![Fluval M 50-Watt Submersible Aquarium Heater for Fresh & Saltwater Tanks - Image 1](https://m.media-amazon.com/images/I/71JRKsqOfHL.jpg)
![Fluval M 50-Watt Submersible Aquarium Heater for Fresh & Saltwater Tanks - Image 2](https://m.media-amazon.com/images/I/91-t+FwADQL.jpg)
![Fluval M 50-Watt Submersible Aquarium Heater for Fresh & Saltwater Tanks - Image 3](https://m.media-amazon.com/images/I/81CHh1+rx2L.jpg)
![Fluval M 50-Watt Submersible Aquarium Heater for Fresh & Saltwater Tanks - Image 4](https://m.media-amazon.com/images/I/81lBwwrivML.jpg)
![Fluval M 50-Watt Submersible Aquarium Heater for Fresh & Saltwater Tanks - Image 5](https://m.media-amazon.com/images/I/71oUhu5PtIL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great product!!!
*by O***M on November 7, 2025*

I love this heater. I have been using it in my betta's tank for about a year, and so far, it has worked very well! This heater is not made for being completely submerged under water. The black and grey part (the part above the little wavy marks) must be above water, along with the cord. I put this heater right next to my filter so that the filter motor can move the warmed water around the aquarium evenly. This heater is, of course, automatic. It has a thermostat somewhere in it that tells it to turn on when the water is too cool and turn off when the water gets warm enough. When the heater is warming your tank water, there will be a blue light on the side, and when it turns on and off, it will make a clicking sound and the light will turn on or off. This is a very good heater for my five-gallon tank. I have it set at about 81 degrees, and it keeps my tank at a steady 78 or 79 degrees Fahrenheit (which is the perfect temperature for betta fish). I am very impressed!

### ⭐⭐⭐⭐⭐ Works fine
*by V***A on September 12, 2013*

So I went through and looked at all the 50W's heater reviews and only about two of maybe twelve were negative or lower than four, so I went for it and bought it. I tend to go for ViaAqua, and for most all my tanks have their glass heaters (in 50W and 200W). I didn't for this tank in part because the price went up for the ViaAqua heater I normally get for 5g tanks, and I splurged and got the Fluval Chi and figured I may as well keep with all one brand for this tank. I don't think it has to go on very much, save for maybe at night, but in winter I'm sure it will be used much more. It is an attractive heater, I suppose - looks nice in the tank for a heater. It isn't really invisible, though it isn't as visible as some people said it was. I never needed it to blend in with the tank, so I didn't really care if it was or wasn't visible. I think because I have a Fluval tank it is less visible (they are really reflective, I guess, so if you don't have plants that go too high in it, then I think it probably blends in better). If I have any issues with it, I'll edit this, but I think because it is a fairly low power heater, it won't be too much of a problem. A lot of the negative reviews this product got was for a different size (the 300W and 200W ones, I think).

### ⭐⭐⭐⭐⭐ Accurate to one tenth of a degree!
*by D***K on July 10, 2026*

Accurate to one tenth of a degree. Super stable even with my ac blowing on the ten gallon shrimp tank. Bigger in length than the one in my twenty gallon but a lot better than the Penn Plax 50w it replaced. I have it mounted sideways despite the manual saying not to. Everyone says it is better sideways and they are right. This brand is my go to going forward. Highly recommended.

## Frequently Bought Together

- Fluval M 50-Watt Submersible Heater
- PAIZOO Fish Tank Digital Thermometer Accurate LED Display to ±0.9°F Tank Thermometer Aquarium Temperature Measurement Suitable for Fish, Axolotl, Turtle or Aquatic
- Hagen Flex Freshwater Kit - Black - 15 gal

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*Product available on Desertcart Senegal*
*Store origin: SN*
*Last updated: 2026-07-31*