---
product_id: 4160081
title: "M 50-Watt Submersible Aquarium Heater – Compact, Reliable Heating with Mirror Technology for Fresh & Saltwater Tanks Up to 15 Gallons"
brand: "fluval"
price: "317 Lei"
currency: RON
in_stock: true
reviews_count: 11
category: "Fluval"
url: https://www.desertcart.ro/products/4160081-m-50-watt-submersible-aquarium-heater-compact-reliable-heating-mirror
store_origin: RO
region: Romania
---

# Borosilicate Glass + Ceramic Durability Mirror Tech for Invisible Fit Precision Temp Control ±1°F M 50-Watt Submersible Aquarium Heater – Compact, Reliable Heating with Mirror Technology for Fresh & Saltwater Tanks Up to 15 Gallons

**Brand:** fluval
**Price:** 317 Lei
**Availability:** ✅ In Stock

## Summary

> 🌊 Heat your tank, not your style—Fluval M keeps it coolly invisible!

## Quick Answers

- **What is this?** M 50-Watt Submersible Aquarium Heater – Compact, Reliable Heating with Mirror Technology for Fresh & Saltwater Tanks Up to 15 Gallons by fluval
- **How much does it cost?** 317 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/4160081-m-50-watt-submersible-aquarium-heater-compact-reliable-heating-mirror)

## 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

- • **Invisible Elegance:** Reflective mirror technology blends heater seamlessly into your tank’s natural scenery—no eyesores here.
- • **Fresh & Saltwater Ready:** Versatile 50-watt power perfect for both freshwater and saltwater environments—your fish’s comfort guaranteed.
- • **Slim & Sleek Installation:** Compact design fits discreetly in tanks up to 15 gallons without cluttering your aquatic masterpiece.
- • **Consistent Climate Mastery:** Computer-calibrated thermostat ensures rock-solid temperature stability for thriving aquatic life.
- • **Built to Last, Built for Safety:** Shock-resistant borosilicate glass and ceramic heat sink deliver even heat and long-lasting durability.

## Overview

The Fluval M 50-Watt Submersible Aquarium Heater offers precise temperature control with a computer-calibrated thermostat, ensuring stable aquatic environments up to 15 gallons. Its unique reflective mirror technology camouflages the heater within your tank, preserving natural aesthetics. Constructed from shock-resistant borosilicate glass and a ceramic heat sink, it guarantees durability and safe, even heating. Compact and easy to install, this heater is ideal for both freshwater and saltwater tanks, backed by a 3-year warranty for reliable performance.

## Description

The Fluval "M" 50 watt submersible heater is quality manufactured in Europe using superior components and construction. This sleek, compact Fluval heater can be trusted for exceptional performance and unsurpassed reliability. Unique only to the Fluval "M" series the reflective technology helps maintain the aquariums' natural look as the heater reflects the colors of the surroundings. The heater is ideal for 15 US gal (50L). aquariums and can be used in fresh and saltwater tanks.

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: The only heater that reliably works for my 10‑gallon tank - After trying several different aquarium heaters, this Fluval M 150‑watt model is the only one that has consistently kept my 10‑gallon tank at the correct temperature. It heats evenly, stays stable, and doesn’t fluctuate the way other brands did. For a small tank that needs dependable temperature control, this has been the most reliable option I’ve used. For ambient air context, it's winter and the house dips to 60 degrees at night. I have a cover on the tank which is essential.

## 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 |
| ASIN  | B0027VMPXA |
| Age Range Description | All ages |
| Best Sellers Rank | #6,171 in Pet Supplies ( See Top 100 in Pet Supplies ) #17 in Aquarium Heaters |
| Brand Name | Fluval |
| Breed Recommendation | All Breed Sizes |
| Color | Silver |
| Customer Reviews | 4.4 4.4 out of 5 stars (5,484) |
| Date First Available | August 19, 2004 |
| Date First Available  | August 19, 2004 |
| Directions | The Fluval "M" 50 watt submersible heater is quality manufactured in Europe using superior components and construction. This sleek, compact Fluval heater can be trusted for exceptional performance and unsurpassed reliability. Unique only to the Fluval "M" series the reflective technology helps maintain the aquariums' natural look as the heater reflects the colors of the surroundings. The heater is… |
| Included Components | Fluval M50 Submersible Glass Aquarium Heater (50 watts) |
| Is Discontinued By Manufacturer  | No |
| Item Dimensions LxWxH | 1.8 x 4.8 x 14.8 inches |
| Item Package Dimensions L x W x H | 14.68 x 4.76 x 1.77 inches |
| Item Weight | 9.86 ounces |
| Item model number | M50 |
| Item model number  | M50 |
| Manufacturer | Rolf C. Hagen (USA) Corp. |
| Manufacturer  | Rolf C. Hagen (USA) Corp. |
| Material | Borosilicate Glass, Ceramic |
| Model Name | A781 |
| Number of Items | 1 |
| Product Dimensions  | 1.8 x 4.8 x 14.8 inches; 9.86 ounces |
| Size | M50 |
| Specific Uses for Product | Aquarium Heating |
| Style | Modern |
| Target Audience Keyword | algae-eaters, betta-fish, bottom-feeder-fish, cichlid-fish, fish, goldfish, invertebrate-fish, mollusks, octopuses, rays, sharks, snails |
| 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… |

## Product Details

- **Brand:** Fluval
- **Color:** Silver
- **Item Weight:** 9.86 ounces
- **Material:** Borosilicate Glass, Ceramic
- **Product Dimensions:** 1.8"L x 4.8"W x 14.8"H
- **Shape:** Rectangular
- **Special Feature:** Reflective Technology
- **Specific Uses For Product:** Aquarium Heating
- **Style:** Modern
- **Tank Volume:** 15 Gallons

## Images

![M 50-Watt Submersible Aquarium Heater – Compact, Reliable Heating with Mirror Technology for Fresh & Saltwater Tanks Up to 15 Gallons - Image 1](https://m.media-amazon.com/images/I/51WWXuBdCxL.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!

### ⭐⭐⭐⭐⭐ The only heater that reliably works for my 10‑gallon tank
*by T***S on January 18, 2026*

After trying several different aquarium heaters, this Fluval M 150‑watt model is the only one that has consistently kept my 10‑gallon tank at the correct temperature. It heats evenly, stays stable, and doesn’t fluctuate the way other brands did. For a small tank that needs dependable temperature control, this has been the most reliable option I’ve used. For ambient air context, it's winter and the house dips to 60 degrees at night. I have a cover on the tank which is essential.

### ⭐⭐⭐⭐⭐ Reliable and Low-Key (in the Best Way)
*by M***L on July 25, 2025*

This Fluval heater is a solid piece of equipment. I’ve had it running for almost 2 years now and it’s still performing like a champ — keeps the water at just the right temp without any fuss. The borosilicate glass design is a nice touch — it blends into the tank much better than those bulky, obvious heaters. You can still see it, but it’s not screaming for attention. The temperature dial is easy to use and overall it feels well-built and dependable. If you’re looking for a heater that just works and doesn’t make your tank look like a science experiment, this is a great pick. Its a good size, nice and slim and definitely worth every penny.

## 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 Romania*
*Store origin: RO*
*Last updated: 2026-02-10*