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Fluval

Fluval E 300 Watt Electronic Heater

  • Based on 3,210 reviews
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Availability: In Stock.
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Arrives Saturday, May 23
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Style: E300


Pattern Name: Heater


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

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.

Brand: Fluval


Color: Blue


Form Factor: Aquarium Heater


Indoor/Outdoor Usage: Indoor


Power Source: Corded Electric


Form Factor: Aquarium Heater


Indoor Outdoor Usage: Indoor


Power Source: Corded Electric


Heating Method: Convection, Forced Air


Recommended Uses For Product: For use in freshwater and saltwater aquariums


Mounting Type: Slim mounting bracket


Room Type: Living Room


Heating Coverage: 100 square feet


Heating Element: Radiant


Heat Output: 300 Watts


Fuel Type: Electric


Voltage: 230 Volts


Min Temperature Setting: 20 Degrees Celsius


Max Temperature Setting: 2 Degrees Fahrenheit


Item Dimensions D x W x H: 1.8"D x 3.3"W x 18.2"H


Item Weight: 0.37 Kilograms


Brand Name: Fluval


Model Number: A774


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 does not apply to any heater that has been subjected to misuse, negligence, or tampering. No liability is assumed with respect to loss or damage to livestock or personal property irrespective of the cause thereof.


UPC: 015561107747 015561014168


Global Trade Identification Number: 47


Part Number: A774


Unit Count: 1.0 Count


Item Type Name: HAGEN FLUVAL E 300W HEATER


Manufacturer: Rolf C. Hagen (USA) Corp.


Included Components: Fluval Advance Electronic Aquarium Heater (300 Watt)


Color: Blue


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, May 23

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Similar Products

Top Amazon Reviews

    • Easily the best heater I've used in my 40+ years in the hobby
Style: E100 Pattern Name: Heater
Review Image by Russell D. Carroll
Review Image by Russell D. Carroll
Review Image by Russell D. Carroll
Review Image by Russell D. Carroll
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. ... show more
Reviewed in the United States on February 28, 2026 by Russell D. Carroll
    • amazing heater!
Style: E200 Pattern Name: 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! ... show more
Reviewed in the United States on April 9, 2026 by Josie
    • Works great with a few tips.
Style: E100 Pattern Name: Heater
I generally don't leave reviews for products, even ones I love, but I wanted to clear up an issue people were having with this heater in comparison to others. The temperature indication is spot on, very accurate. The design is sleek and well constructed. The issue I was having with this unit was not being able to maintain tank temperature in a very cold room, even though I oversized the wattage/gallons ratio by over double the recommended specifications. I believe the shrouding around the glass mildly hinders heat distribution so it is important that this unit gets adequate flow from the filter. I placed the heater directly under my filter return but still randomly had scenarios where the temperature dropped and stayed in the blue, even for a couple days. Then it would rise to green and maintain no problem. What I realized over time was whenever I did water changes or added water, the temperature dropped that night, even if the water added was warmer than the tank water. As the water level dropped over the next few days from evaporation, the temperature rose back up to normal. My hypothesis: If the water level in the tank is a hair too high, there is less disturbance created from the filter return, even though you are still achieving the same turnover rate. Try either lowering the water level in half inch increments until the temperature is able to maintain, or try rotating the heater sideways to achieve more flow through the shrouding. I recommend the first option because turning the heater sideways looks ridiculous with the digital display. I now maintain 77-78 degrees constantly in a 55 degree room and would purchase this heater again. Fluval makes excellent products. ... show more
Reviewed in the United States on December 3, 2017 by Matt
    • Smart, maybe too smart, but still a good piece of hardware
Style: E100 Pattern Name: Heater
Review Image by Matthew Cajigal
Too smart for its own good. Although I had trouble with this heater in my particular setup, overall it is a fantastic piece of hardware. If I were to gripe about anything I would comment on the heater's +/- 2 accuracy. In my 10 gallon column setup I had to set the heater to 80.5 + to maintain a temperature of 77 on the heater's display. The display would show green as soon as it was within 2 degrees of the target temp so heating to 78 would leave the water at 76. In a tank with a high flow setup this probably would be fine but with the stock of fish and plants I have high flow would negatively impact my tank. The slow pulse heating strategy is a good idea in theory, but unfortunately couldn't keep up with ambient temperature drops at nightm ... show more
Reviewed in the United States on February 18, 2026 by Matthew Cajigal

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