---
product_id: 443143996
title: "Fluval T300 Fully Electronic Heater for Freshwater Aquariums up to 80 Gal."
brand: "fluval"
price: "€ 139.24"
currency: EUR
in_stock: true
reviews_count: 13
category: "Fluval"
url: https://www.desertcart.fi/products/443143996-fluval-t300-fully-electronic-heater-for-freshwater-aquariums-up-to
store_origin: FI
region: Finland
---

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

**Brand:** fluval
**Price:** € 139.24
**Availability:** ✅ In Stock

## Summary

> 🌊 Heat your tank like a pro—never miss a beat with Fluval T300!

## Quick Answers

- **What is this?** Fluval T300 Fully Electronic Heater for Freshwater Aquariums up to 80 Gal. by fluval
- **How much does it cost?** € 139.24 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/443143996-fluval-t300-fully-electronic-heater-for-freshwater-aquariums-up-to)

## 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

- • **Visual Heat Status:** 360° LED ring glows red when heating and blue when target temperature is reached—monitor your tank’s warmth at a glance.
- • **Safety-First Innovation:** Auto shut-off in absence of water plus a protective Heater Guard to prevent overheating and breakage—peace of mind 24/7.
- • **Effortless Customization:** Large grip dial lets you fine-tune water temperature between 72°F and 90°F with ease and confidence.
- • **Precision Heating Mastery:** Advanced electronic design ensures stable, accurate temperature control for your freshwater aquarium up to 80 gallons.
- • **Sleek, Submersible Design:** Fully submersible and mountable vertically or horizontally, blending seamlessly into your aquarium’s aesthetic.

## Overview

The Fluval T300 is a 300-watt fully submersible electronic heater designed for freshwater aquariums up to 80 gallons. It features precise temperature control from 72°F to 90°F, a 360° LED indicator ring for real-time heating status, and multiple safety mechanisms including automatic shut-off and a protective Heater Guard. Its sleek design and easy-to-use dial make it a top choice for millennial aquarists seeking reliable, stylish, and efficient aquarium heating.

## 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 |
|---------------|-------|
| ASIN | B0B1S7TY3J |
| ASIN  | B0B1S7TY3J |
| Age Range Description | All Life Stages |
| Best Sellers Rank | #32,053 in Pet Supplies ( See Top 100 in Pet Supplies ) #77 in Aquarium Heaters |
| Brand Name | Fluval |
| Color | T300 |
| Customer Reviews | 4.1 4.1 out of 5 stars (1,037) |
| Date First Available | May 20, 2022 |
| Date First Available  | May 20, 2022 |
| Directions | Follow individual packaging instructions. |
| Included Components | All items listed in description. |
| Item Dimensions LxWxH | 4.9 x 5 x 1.7 inches |
| Item Package Dimensions L x W x H | 17.44 x 3.5 x 2.24 inches |
| Item Weight | 15.8 ounces |
| Item model number | 14884 |
| Item model number  | 14884 |
| Manufacturer | Rolf C. Hagen (USA) Corp. |
| Manufacturer  | Rolf C. Hagen (USA) Corp. |
| Model Name | Fluval T300, 300 Watt Safety Heater |
| Product Dimensions  | 4.9 x 5 x 1.7 inches; 15.87 ounces |
| Size | T300 |
| Specific Uses for Product | Indoor |
| Style | T300 |
| Target Audience Keyword | Fish |
| Warranty Description | 2 Year Limited Warranty |

## 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/81BZ+uKyPxL.jpg)
![Fluval T300 Fully Electronic Heater for Freshwater Aquariums up to 80 Gal. - Image 3](https://m.media-amazon.com/images/I/811iw7nHVGL.jpg)
![Fluval T300 Fully Electronic Heater for Freshwater Aquariums up to 80 Gal. - Image 4](https://m.media-amazon.com/images/I/810RPmfm2ML.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.

### ⭐⭐⭐⭐⭐ Simply the best! 🇮🇹 🐠
*by S***A on February 24, 2026*

The Fluval T200 is an outstanding piece of electronic device. I no longer have to deal with temp fluctuations that I was getting by using the cheaper off-brand heaters that are less expensive. If you want the best, then I suggest Fluval. I'm also very impressed that Fluval is slowly giving the hobby a new futuristic look. This heater looks awesome! Thanks Fluval!! 🐠 🐠 🇮🇹 🇮🇹

## Frequently Bought Together

- Fluval T300 Fully Electronic Heater for Freshwater Aquariums up to 80 Gal.
- PAIZOO Fish Tank Digital Thermometer Accurate LED Display to ±0.9°F Tank Thermometer Aquarium Temperature Measurement Suitable for Fish, Axolotl, Turtle or Aquatic
- Fluval FX2 High Performance Canister Aquarium Filter - Multi-Stage Filtration, Built-in Powered Water Change System, and Basket-in-Basket Tray Design

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-03-07*