---
product_id: 443143996
title: "Fluval T300 Fully Electronic Heater for Freshwater Aquariums up to 80 Gal."
price: "€ 75.10"
currency: EUR
in_stock: true
reviews_count: 8
url: https://www.desertcart.ie/products/443143996-fluval-t300-fully-electronic-heater-for-freshwater-aquariums-up-to
store_origin: IE
region: Ireland
---

# 300W power for rapid heating Precise temp control 72-90°F 360° heat mode indicator ring Fluval T300 Fully Electronic Heater for Freshwater Aquariums up to 80 Gal.

**Price:** € 75.10
**Availability:** ✅ In Stock

## Summary

> 🔥 Keep your aquatic world perfectly cozy with Fluval’s smartest heater yet!

## Quick Answers

- **What is this?** Fluval T300 Fully Electronic Heater for Freshwater Aquariums up to 80 Gal.
- **How much does it cost?** € 75.10 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/443143996-fluval-t300-fully-electronic-heater-for-freshwater-aquariums-up-to)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Rapid 300W Heating Power:** Effortlessly warms up to 80 gallons with industry-leading speed.
- • **Smart Safety Auto-Shutdown:** Protects your tank by cutting power if water is absent—peace of mind 24/7.
- • **360° Visual Heat Indicator:** Stay informed at a glance with vibrant red/blue LED ring lighting.
- • **Precision Temperature Control:** Easily dial in your ideal 72-90°F range with a large, intuitive grip.
- • **Sleek Fully Submersible Design:** Discreetly fits anywhere in your aquarium, vertically or horizontally.

## Overview

The Fluval T300 is a 300-watt fully submersible electronic heater designed for freshwater aquariums up to 80 gallons. It offers precise temperature control from 72-90°F, a 360° LED indicator ring for heating status, and advanced safety features including automatic power cut-off when water is absent. Its durable design and easy-to-use dial make it a reliable choice for maintaining stable, safe aquatic environments.

## Description

The Fluval T Series submersible heaters combine electronic accuracy, reliable monitoring and several safety features to maintain desired water temperatures with convenience in mind. Five model sizes are available to accommodate today’s most popular aquarium sizes. For more fish tank accessories, check out other Fluval products including aquarium filters, aquarium heaters, aquarium air pumps, aquarium lights, aquarium rocks, aquarium thermometers, and aquarium stands. Fluval has a wide variety of products that are perfect for your pet fish to enjoy in any large fish tank, small fish tank, saltwater tank or freshwater tank. Fluval broke onto the aquatic scene in 1975 by introducing the world’s first 3-stage filter with synchronous motor technology – a breakthrough that is still applied in the industry today. Since then, Fluval has built a legacy around this pioneering spirit, relentlessly adapting in a changing world to launch innovative aquarium products that remain at the forefront of technology, and which set the bar in quality, style and functionality. Fluval’s mission is not just about building products that mimic the natural world, but inspiring aquarists of all skill levels to enjoy and respect the hobby for generations to come.

Review: Excellent heater! - It’s kept my Fluval Flex 15g at 80f without issues while room temp is at 70f. It raised the temp to target in about 4 hours. Remember, your results will vary. It’s mounted in the back beside the pump. I let it come to temp in tank for 30 mins before plugging in as directions stated. Because it’s all Fluval I wasn’t worried about fitment. I keep the dial just above the water line but it’s fully submersible if desired. The red/blue light makes it easy to tell when it’s warming. Because of placement you can’t see it so you get a photo of my fresh tank instead. Fluval for life.
Review: Works fast, heater guard may be stuck in box or fall off - I’m a believer in mild overkill when it comes to heaters because I like to keep my house cold. I got the 300 watt heater for a 55 gallon tank. In 3 hours it safely took my (new, uninhabited) tank from 67 to 78 degrees. I like the (mostly) black design that blends into my painted black tank background and the aesthetically pleasing light ring that displays whether it is currently heating or not. The adjustment dial seems to have a lot of little notches if not a continuous spectrum of temps to choose from. One minor annoyance was that when I pulled the product out of the box, the black heater guard that goes on the end was stuck in a bit of styrofoam way down in the bottom of the box. I almost threw the box away and assumed I’d just gotten one without all the pieces. Then when I applied it to the already-wet heater, it popped off a couple of times. It’s not strictly necessary for my needs since my heater is safely tucked away in a vertical position where fish can’t get to it, but still, watch out for that.

## Features

- 300-Watt heater designed for freshwater aquariums up to 80 Gal (300 L) with advanced electronic construction provides superior accuracy, stability and long-term performance
- 24/7 monitoring regulates temperature and avoids large, unsafe fluctuations and 360° indicator light ring displays heat mode clearly from any angle (illuminates RED when heating function is engaged and BLUE when desired temperature is achieved)
- In absence of water, the T-Heater automatically cuts power to prevent overheating and Heater Guard provides additional protection against breakage
- Large grip dial easily adjusts water temperature from 72-90˚F / 22-32˚C
- Fully submersible design allows for placement anywhere in aquarium either vertically or horizontally

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Customer Reviews | 4.2 out of 5 stars 1,010 Reviews |

## Images

![Fluval T300 Fully Electronic Heater for Freshwater Aquariums up to 80 Gal. - Image 1](https://m.media-amazon.com/images/I/71A3hgzL8PL.jpg)
![Fluval T300 Fully Electronic Heater for Freshwater Aquariums up to 80 Gal. - Image 2](https://m.media-amazon.com/images/I/81-FNu3itQL.jpg)
![Fluval T300 Fully Electronic Heater for Freshwater Aquariums up to 80 Gal. - Image 3](https://m.media-amazon.com/images/I/810RPmfm2ML.jpg)
![Fluval T300 Fully Electronic Heater for Freshwater Aquariums up to 80 Gal. - Image 4](https://m.media-amazon.com/images/I/811iw7nHVGL.jpg)
![Fluval T300 Fully Electronic Heater for Freshwater Aquariums up to 80 Gal. - Image 5](https://m.media-amazon.com/images/I/819eVUlK2GL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excellent heater!
*by J***. on November 11, 2025*

It’s kept my Fluval Flex 15g at 80f without issues while room temp is at 70f. It raised the temp to target in about 4 hours. Remember, your results will vary. It’s mounted in the back beside the pump. I let it come to temp in tank for 30 mins before plugging in as directions stated. Because it’s all Fluval I wasn’t worried about fitment. I keep the dial just above the water line but it’s fully submersible if desired. The red/blue light makes it easy to tell when it’s warming. Because of placement you can’t see it so you get a photo of my fresh tank instead. Fluval for life.

### ⭐⭐⭐⭐⭐ Works fast, heater guard may be stuck in box or fall off
*by D***H on March 8, 2023*

I’m a believer in mild overkill when it comes to heaters because I like to keep my house cold. I got the 300 watt heater for a 55 gallon tank. In 3 hours it safely took my (new, uninhabited) tank from 67 to 78 degrees. I like the (mostly) black design that blends into my painted black tank background and the aesthetically pleasing light ring that displays whether it is currently heating or not. The adjustment dial seems to have a lot of little notches if not a continuous spectrum of temps to choose from. One minor annoyance was that when I pulled the product out of the box, the black heater guard that goes on the end was stuck in a bit of styrofoam way down in the bottom of the box. I almost threw the box away and assumed I’d just gotten one without all the pieces. Then when I applied it to the already-wet heater, it popped off a couple of times. It’s not strictly necessary for my needs since my heater is safely tucked away in a vertical position where fish can’t get to it, but still, watch out for that.

### ⭐⭐⭐⭐⭐ Product Quality
*by C***L on January 7, 2026*

Good item

## Frequently Bought Together

- Fluval T300 Fully Electronic Heater for Freshwater Aquariums up to 80 Gal.
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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-02-11*