--- 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: "€ 61.14" currency: EUR in_stock: true reviews_count: 11 category: "Fluval" url: https://www.desertcart.hr/products/4160081-m-50-watt-submersible-aquarium-heater-compact-reliable-heating-mirror store_origin: HR region: Croatia --- # Borosilicate Glass + Ceramic Build 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:** € 61.14 **Availability:** ✅ In Stock ## Summary > 🌊 Heat your tank, not your style — invisible warmth for thriving aquatic vibes! ## 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?** € 61.14 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/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 - • **Built to Endure:** Shock-resistant borosilicate glass and high-density ceramic heat sink deliver durability and even heat distribution for worry-free operation. - • **Invisible Elegance:** Reflective mirror technology camouflages the heater seamlessly, preserving your tank’s natural aesthetic and Instagram-worthy vibes. - • **Space-Savvy Design:** Slim, compact profile fits discreetly in tanks up to 15 gallons, maximizing your aquarium’s visual appeal without clutter. - • **Universal Compatibility:** Engineered for both freshwater and saltwater tanks, making it the go-to heater for diverse aquatic lifestyles. - • **Consistent Climate Mastery:** Computer-calibrated thermostat ensures your aquatic ecosystem stays perfectly balanced with ±1°F accuracy. ## 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 blends the heater into your tank’s surroundings, maintaining a sleek, natural look. Constructed from durable borosilicate glass and ceramic, it guarantees safe, even heating for both freshwater and saltwater aquariums. Compact and easy to install, this European-made heater is trusted for reliability and performance, backed by a 3-year warranty. ## 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 | #6,323 in Pet Supplies ( See Top 100 in Pet Supplies ) #14 in Aquarium Heaters | | Brand Name | Fluval | | Breed Recommendation | All Breed Sizes | | Color | Silver | | Customer Reviews | 4.4 4.4 out of 5 stars (5,501) | | 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 | 0.62 Pounds | | 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:** 0.62 Pounds - **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/71JRKsqOfHL.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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/4160081-m-50-watt-submersible-aquarium-heater-compact-reliable-heating-mirror](https://www.desertcart.hr/products/4160081-m-50-watt-submersible-aquarium-heater-compact-reliable-heating-mirror) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-04-25*