--- product_id: 2221553 title: "Fluval E 300 Watt Electronic Heater" brand: "fluval" price: "€ 112.03" currency: EUR in_stock: true reviews_count: 13 category: "Fluval" url: https://www.desertcart.at/products/2221553-fluval-e-300-watt-electronic-heater store_origin: AT region: Austria --- # 300W precise heating Real-time digital temp display Dual sensor safety guard Fluval E 300 Watt Electronic Heater **Brand:** fluval **Price:** € 112.03 **Availability:** ✅ In Stock ## Summary > 🌊 Keep your aquarium thriving with precision and peace of mind! ## Quick Answers - **What is this?** Fluval E 300 Watt Electronic Heater by fluval - **How much does it cost?** € 112.03 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/2221553-fluval-e-300-watt-electronic-heater) ## 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 - • **Sleek Digital Display:** Always-on LED screen offers instant, clear temperature insights at a glance—no guesswork needed. - • **Rock-Solid Reliability:** Built to last with premium materials and backed by a 5-year warranty—because your tank deserves the best. - • **Pinpoint Precision Control:** Adjust temperature in ultra-fine 0.5°C increments for ultimate aquatic comfort. - • **Smart Dual Sensor Monitoring:** Continuous real-time temperature feedback ensures zero surprises and stable tank conditions. - • **Advanced Fish Guard Protection:** Integrated safety casing shields your aquatic friends from harm, elevating tank security. ## Overview The Fluval E 300 Watt Electronic Heater is a top-tier aquarium heater featuring a 300W radiant heating element, dual temperature sensors with intelligent microprocessor control, and a real-time digital display. Designed for medium to large freshwater and saltwater tanks, it offers precise temperature adjustments in 0.5°C increments and includes an integrated fish guard for enhanced safety. Its premium build quality and 5-year warranty make it a trusted choice for serious aquarists seeking stable, reliable heating and advanced protection. ## Description The most technologically advanced aquarium heater available today, Fluval E300 Advanced Electronic Heater with VueTech technology delivers peace of mind thanks to several excellent features.Equipped with an intelligent digital microprocessor monitoring system with dual temperature sensors, this heater continuously monitors and displays aquarium water temperature, ensuring the safety and well-being of your aquarium inhabitants. Review: Easily the best heater I've used in my 40+ years in the hobby - I spent a LOT of time figuring out which heaters to get to replace my eheim jager heaters that I'd used for 20+ years. In reading all the reviews of every heater and trying a bunch of different ones, the E series from Fluval was far and away the winner. I have been in the hobby 40+ years and have had that dreaded moment when you come home to a tank of dead fish b/c the heater malfunctioned. NO ONE in reviews for this heater had talked about that when I started shopping, and with the 8 I now I have, I can report the same - NO PROBLEMS - my tanks stay where they are supposed to! I've also had glass on heaters break - becoming a live wire in the fish tank. With these heaters - again, NO PROBLEMS - and the reviews support it. This heater is strong, and built to be nearly indestructible. I've also had, and always had, heaters that became difficult to adjust over time. That would slowly heat to a lower or higher temperature, and that became very difficult to adjust. This has led to disease outbreaks due to temperature fluctuations. With this heater - I've again had NO PROBLEMS! Most of the complaints I saw about this heater were due to seeing LF - Low Flow blinking. I figured, if that was the biggest problem I'd have, then this heater was a HUGE WIN, and it has been. Not to say I haven't seen the dreaded LF indicator, but, I would state that I've always been able to address it. I run canister filters on all of my fish tanks and on all 8 of them, changing how the water flows out of the canister filter in the tank has resolved the issue. Sometimes it takes some fiddling - I'll give you that, but all 8 of mine work perfectly and when I see LF - I know something has changed in the tank and is causing issues (for me - typically it is related to large plants blocking flow). I LOVE the always on display, like love, love, love it! At a glance I can tell if there are problems in temperature. I also appreciate how easy it is to adjust temperature, just flick the switch left or right and you are good. Easy Peasy. In the end - I started with one, and slowly, over 4 years, have replaced 8 or my 10 heaters with these, and I couldn't be happier. They are easily the best heater I've had in my many years keeping fish. That said - I do have 2 complaints. 1 - Replacing the rubber suction cups is currently very difficult b/c Fluval doesn't make replacements very available. 2 - It is very difficult to clean the heater housing if (when!) it becomes covered with hair or brown brush algae. Neither of those things are deal breakers for me, but are worth mentioning. Review: amazing heater! - i bought this for my 55 gallon red eared slider tank, and it works great. it’s easy to set up and move around, the suction cups allow you to adjust how far in the water it goes. it’s not too big and fits in my tank well. it keeps my turtles water a comfortable temperature, even when the rest of the room is cold. i love that it comes with protective plastic casing, so i don’t have to worry about my destructive turtle trying to eat it! ## Features - Continuously monitors and displays aquarium water temperature in real time - Intelligent digital microprocessor monitoring system with dual temperature sensors - Ensures the safety and well-being of your aquarium inhabitants - Precision temperature control allows settings in 0.5-degree increments - Integrated fish guard provides advanced protection ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B001VMSK0I | | Best Sellers Rank | #12,603 in Pet Supplies ( See Top 100 in Pet Supplies ) #19 in Aquarium Heaters | | Brand | Fluval | | Brand Name | Fluval | | Capacity | 100 Gallons | | Color | Blue | | Customer Reviews | 4.3 out of 5 stars 6,163 Reviews | | Global Trade Identification Number | 00015561107747 | | Heat Output | 300 Watts | | Included Components | Fluval Advance Electronic Aquarium Heater (300 Watt) | | Is Electric | Yes | | Item Type Name | HAGEN FLUVAL E 300W HEATER | | Item Weight | 0.37 Kilograms | | Manufacturer | Rolf C. Hagen (USA) Corp. | | Manufacturer Part Number | A774 | | Manufacturer Warranty Description | 5 years; fluval e series heaters are guaranteed against defects in material or workmanship under normal aquarium usage and service for 5 years. We offer a 5 year guarantee on all nonreplaceable parts which means that the heater will be repaired or replaced at the manufacturer's discretion, free of charge, when the complete heater is returned with proof of purchase and postage paid. This warranty d… | | Material Type | Plastic | | Model Number | A774 | | Mount Type | Slim mounting bracket | | Power Source | Corded Electric | | Style Name | E300 | | UPC | 015561107747 015561014168 | | Unit Count | 1.0 Count | | Voltage | 230 Volts | | Wattage | 300 watts | ## Product Details - **Brand:** Fluval - **Color:** Blue - **Form Factor:** Aquarium Heater - **Indoor/Outdoor Usage:** Indoor - **Power Source:** Corded Electric ## Images ![Fluval E 300 Watt Electronic Heater - Image 1](https://m.media-amazon.com/images/I/61AOPqZZuxL.jpg) ![Fluval E 300 Watt Electronic Heater - Image 2](https://m.media-amazon.com/images/I/71wPfYL5F-L.jpg) ![Fluval E 300 Watt Electronic Heater - Image 3](https://m.media-amazon.com/images/I/71NA62rvrcL.jpg) ![Fluval E 300 Watt Electronic Heater - Image 4](https://m.media-amazon.com/images/I/71pnQbT6b9L.jpg) ![Fluval E 300 Watt Electronic Heater - Image 5](https://m.media-amazon.com/images/I/71d0RPJbFbL.jpg) ## Available Options This product comes in different **Pattern, Style** options. ## Questions & Answers **Q: Just can't seem to adjust the temp. It flashes 77, but the temp stays at 75. Why?** A: I was having the same problem, though mine was stuck at 74.5--it stayed blue and never got higher, though it was set to 77. I called Hagen, and they said try unplugging it for 10 minutes, then plug it back in to see if that helps. It didn't; they'd said if that was the case it was defective and to return it. Mine was <1 week old. **Q: I just bought this item September of last year and it wont let me adjust the temperature after the initial setting when I first had it** A: So you move the adjusting orange dial/thingy and doesn't change temp? Some times you have to move it all the way, let it return to the neutral position and the move it again to and so on. If that doesn't work, it may be faulty, contact Fluval, these have good warranty. **Q: does this heater go in the tank** A: To clear any confusion, the heater is fully submersible to 39 inches. The photos in the instruction showing tank placement are misleading. The ones marked with an X means do not let it hang by the cord and do not just lay it on the bottom of the tank. Rest assured that the unit is sealed well and you are better off fully submerging the unit to prevent water evaporation from negatively affecting the heater. **Q: Will I have "low flow" problems running only sponge filters?** A: Your air pump running the sponge filters circulate the water. The pump power will determine whether or not there is “low flow.” ## Customer Reviews ### ⭐⭐⭐⭐⭐ Easily the best heater I've used in my 40+ years in the hobby *by R***L on February 28, 2026* I spent a LOT of time figuring out which heaters to get to replace my eheim jager heaters that I'd used for 20+ years. In reading all the reviews of every heater and trying a bunch of different ones, the E series from Fluval was far and away the winner. I have been in the hobby 40+ years and have had that dreaded moment when you come home to a tank of dead fish b/c the heater malfunctioned. NO ONE in reviews for this heater had talked about that when I started shopping, and with the 8 I now I have, I can report the same - NO PROBLEMS - my tanks stay where they are supposed to! I've also had glass on heaters break - becoming a live wire in the fish tank. With these heaters - again, NO PROBLEMS - and the reviews support it. This heater is strong, and built to be nearly indestructible. I've also had, and always had, heaters that became difficult to adjust over time. That would slowly heat to a lower or higher temperature, and that became very difficult to adjust. This has led to disease outbreaks due to temperature fluctuations. With this heater - I've again had NO PROBLEMS! Most of the complaints I saw about this heater were due to seeing LF - Low Flow blinking. I figured, if that was the biggest problem I'd have, then this heater was a HUGE WIN, and it has been. Not to say I haven't seen the dreaded LF indicator, but, I would state that I've always been able to address it. I run canister filters on all of my fish tanks and on all 8 of them, changing how the water flows out of the canister filter in the tank has resolved the issue. Sometimes it takes some fiddling - I'll give you that, but all 8 of mine work perfectly and when I see LF - I know something has changed in the tank and is causing issues (for me - typically it is related to large plants blocking flow). I LOVE the always on display, like love, love, love it! At a glance I can tell if there are problems in temperature. I also appreciate how easy it is to adjust temperature, just flick the switch left or right and you are good. Easy Peasy. In the end - I started with one, and slowly, over 4 years, have replaced 8 or my 10 heaters with these, and I couldn't be happier. They are easily the best heater I've had in my many years keeping fish. That said - I do have 2 complaints. 1 - Replacing the rubber suction cups is currently very difficult b/c Fluval doesn't make replacements very available. 2 - It is very difficult to clean the heater housing if (when!) it becomes covered with hair or brown brush algae. Neither of those things are deal breakers for me, but are worth mentioning. ### ⭐⭐⭐⭐⭐ amazing heater! *by J***E on April 9, 2026* i bought this for my 55 gallon red eared slider tank, and it works great. it’s easy to set up and move around, the suction cups allow you to adjust how far in the water it goes. it’s not too big and fits in my tank well. it keeps my turtles water a comfortable temperature, even when the rest of the room is cold. i love that it comes with protective plastic casing, so i don’t have to worry about my destructive turtle trying to eat it! ### ⭐⭐⭐⭐⭐ Great heater packed with features *by J***O on May 8, 2026* This heater is great, I love how it has a digital temperature sensor so you can easily see the temperature of the water and how easy it is to adjust the temperature as well. Installation is straightforward like a heaters but this model does have an adjustable mount that lets you adjust it up and down and it also comes with an angle mount so you can place the heater in the corner of the tank. I had to purchase two because of the size of my tank so I wouldn’t have any cold spots but over all great item and very happy with my purchase. ## Frequently Bought Together - Fluval E 300 Watt Electronic 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 - API FRESHWATER MASTER TEST KIT 800-Test Freshwater Aquarium Water Master Test Kit, White, Single, Multi-colored --- ## 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.at/products/2221553-fluval-e-300-watt-electronic-heater](https://www.desertcart.at/products/2221553-fluval-e-300-watt-electronic-heater) --- *Product available on Desertcart Austria* *Store origin: AT* *Last updated: 2026-06-05*