---
product_id: 2221553
title: "Fluval E 300 Watt Electronic Heater"
brand: "fluval"
price: "$U5549"
currency: UYU
in_stock: true
reviews_count: 8
category: "Fluval"
url: https://www.desertcart.uy/products/2221553-fluval-e-300-watt-electronic-heater
store_origin: UY
region: Uruguay
---

# Dual sensor real-time temp display 300W precise heating power Integrated fish guard safety Fluval E 300 Watt Electronic Heater

**Brand:** fluval
**Price:** $U5549
**Availability:** ✅ In Stock

## Summary

> 🌊 Keep your aquarium thriving with precision and safety — because your fish deserve the best!

## Quick Answers

- **What is this?** Fluval E 300 Watt Electronic Heater by fluval
- **How much does it cost?** $U5549 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.uy](https://www.desertcart.uy/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

- • **Stable & Reliable Heating:** Maintains consistent temperature with minimal fluctuations, ensuring fish health.
- • **Unmatched Safety Assurance:** Advanced fish guard and intelligent microprocessor protect your aquatic ecosystem.
- • **Precision at Your Fingertips:** Set temperature in ultra-fine 0.5°C increments for perfect aquatic comfort.
- • **Premium Build with Peace of Mind:** Backed by a 5-year warranty and crafted for durability in medium to large tanks.
- • **Real-Time Temperature Monitoring:** Stay informed with continuous digital display powered by dual sensors.

## Overview

The Fluval E 300 Watt Electronic Heater is a top-tier aquarium heating solution featuring a 300W radiant heating element and dual temperature sensors for real-time monitoring. It offers precision temperature control in 0.5°C increments, an integrated fish guard for enhanced safety, and a stable heating system ideal for medium to large freshwater and saltwater tanks. Designed with a sleek form factor and backed by a 5-year warranty, it ensures reliable, consistent aquatic environments for your prized fish.

## 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: ⭐️⭐️⭐️⭐️⭐️ Precise, stable heating with excellent safety features - The Fluval E200 electronic heater has been rock solid in my aquarium. What really sets it apart is the temperature stability and accuracy. Once set, it maintains the water temperature extremely well without noticeable swings, which is critical for fish health. The digital display is clear and easy to read, and I appreciate being able to adjust the temperature precisely instead of guessing with a dial. The heater reacts quickly when the temperature drops and shuts off properly once the target range is reached. Build quality feels premium and well thought out. The protective casing adds peace of mind, especially in tanks with active fish. It also feels safer than traditional glass heaters thanks to its internal safety features. Pros: • Very accurate temperature control • Clear digital display • Stable heating with minimal fluctuation • Strong safety design and quality build • Ideal for medium to larger aquariums Cons: • Higher price than basic heaters • Takes a bit of space in smaller tanks Overall, this is a reliable, high-quality heater that’s worth the investment if you care about consistency and safety. Perfect for anyone upgrading from basic heaters or running a larger, more sensitive setup.
Review: Excellent heater - When I upgraded my aquarium from a 25 gallon high to a 30 gallon my old E100 was no longer powerful enough (despite the E100 indicating it was good up to 30 gallons). I purchased a E200 which works great. This is an excellent heater that is easy to set and monitor. Note: the digital display on the E200 that was sent was faulty and so I returned it and the replacement has no issues.

## 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 | #16,714 in Pet Supplies ( See Top 100 in Pet Supplies ) #45 in Aquarium Heaters |
| Brand | Fluval |
| Brand Name | Fluval |
| Color | Blue |
| Customer Reviews | 4.2 out of 5 stars 6,054 Reviews |
| Form Factor | Aquarium Heater |
| Fuel Type | Electric |
| Global Trade Identification Number | 00015561107747 |
| Heat Output | 300 Watts |
| Heating Coverage | 100 square feet |
| Heating Element | Radiant |
| Heating Method | Convection, Forced Air |
| Included Components | Fluval Advance Electronic Aquarium Heater (300 Watt) |
| Indoor Outdoor Usage | Indoor |
| Indoor/Outdoor Usage | Indoor |
| Item Dimensions D x W x H | 1.8"D x 3.3"W x 18.2"H |
| Item Type Name | HAGEN FLUVAL E 300W HEATER |
| Item Weight | 0.37 Kilograms |
| Manufacturer | Rolf C. Hagen (USA) Corp. |
| Max Temperature Setting | 2 Degrees Fahrenheit |
| Min Temperature Setting | 20 Degrees Celsius |
| Model Number | A774 |
| Mounting Type | Slim mounting bracket |
| Power Source | Corded Electric |
| Recommended Uses For Product | For use in freshwater and saltwater aquariums |
| Room Type | Living Room |
| UPC | 015561107747 015561014168 |
| Unit Count | 1.0 Count |
| Voltage | 230 Volts |
| 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… |

## 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)

## 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

### ⭐⭐⭐⭐⭐ ⭐️⭐️⭐️⭐️⭐️ Precise, stable heating with excellent safety features
*by A***Y on December 23, 2025*

The Fluval E200 electronic heater has been rock solid in my aquarium. What really sets it apart is the temperature stability and accuracy. Once set, it maintains the water temperature extremely well without noticeable swings, which is critical for fish health. The digital display is clear and easy to read, and I appreciate being able to adjust the temperature precisely instead of guessing with a dial. The heater reacts quickly when the temperature drops and shuts off properly once the target range is reached. Build quality feels premium and well thought out. The protective casing adds peace of mind, especially in tanks with active fish. It also feels safer than traditional glass heaters thanks to its internal safety features. Pros: • Very accurate temperature control • Clear digital display • Stable heating with minimal fluctuation • Strong safety design and quality build • Ideal for medium to larger aquariums Cons: • Higher price than basic heaters • Takes a bit of space in smaller tanks Overall, this is a reliable, high-quality heater that’s worth the investment if you care about consistency and safety. Perfect for anyone upgrading from basic heaters or running a larger, more sensitive setup.

### ⭐⭐⭐⭐⭐ Excellent heater
*by A***R on January 17, 2026*

When I upgraded my aquarium from a 25 gallon high to a 30 gallon my old E100 was no longer powerful enough (despite the E100 indicating it was good up to 30 gallons). I purchased a E200 which works great. This is an excellent heater that is easy to set and monitor. Note: the digital display on the E200 that was sent was faulty and so I returned it and the replacement has no issues.

### ⭐⭐⭐⭐⭐ Works great in my 55 gallon Village. Easily raises temp and communicates well.
*by H***. on April 13, 2013*

I have been using this product for about 4 months and it has worked great. I got this one compared to the E200 just because it was a buck or two more. I have a 55 gallon Texas Map Turtles / Guppy Kingdom / and some lucky large snails. The E300 says it's made for anything 100 gallon and under so it handles my task well. I have read other negative reviews about this heater from people using tanks over 100 and even 150 gallon and even installing it wrong....if you read and follow directions this will work for you. I like the casing it has around it so no animal or anything can get close to the heat tube. It had suction cups that attach directly to the heat casing and they suction really well. I have not had to move mine at all even though I have 4 ninja turtle climbing and jumping off of it hourly. So structure wise its made pretty well. As far as heating the tank it has met my needs. I know this from a couple things. I also use some old school suction cup mercury thermometers and they are in line with the correct temp readings. Also since I had hatchlings I wanted to raise my temp to 81 instead of the 77 it was staying at (I got it in december the cold months remember) it always kept it at 81 and now that the warm has come and there has been some really nice days I appreciate it even more because it flashes a differerent color and lets me know the tank is higher than the level I wanted it at. I set it for 81 but the sunny day made it a lil higher so it let me know. I clicked it down to 78 and it does the job still. I'm going to buy another one for my 75 gallon tank eventually. I will let you know how it performs for 75 gallons maybe at another time but for a 55 gallon it has worked perfect. It may work well for me because I have a tank 100 gallon and under. i positioned it under the water with just the temp. change click showing a little but you can put it deeper if you like (thats what sh....ahhh never mind) and I also put it in the path of my cannister filter flow out put. Heaters and filter work better with water flow not stagnant. This is what has worked well for me. I also might add I am using a cascade 1000 and two cascade 600's so I have constant water movement in the tank and on the heater. Like I said before water movement helps heating and filtration. For me....

## 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

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*Product available on Desertcart Uruguay*
*Store origin: UY*
*Last updated: 2026-02-08*