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Fluval E300 Advanced Electronic Heater, 300-Watt Heater for Aquariums up to 100 Gal., A774

4.4 out of 5 stars 2,049 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Aquarium Heaters by Fluval

Price: $60.99 & FREE Returns
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Style: E300
E300
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Product Dimensions 1.8"D x 3.3"W x 18.2"H
Color Black
Style E300
Shade Material Glass
Item Weight 1.06 Pounds

About this item

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  • Aquarium heater with dual temperature sensors provide accurate and real-time water temperatures
  • LCD temperature display available in both Fahrenheit and Celsius; with a range of 68 to 93 degrees Fahrenheit
  • Fast heat technology built with a safety shut-off and integrated fish guard to protect fish and invertebrates
  • Equipped with a slim profile mounting bracket and colored display alert system
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  • Fluval E300 Advanced Electronic Heater, 300-Watt Heater for Aquariums up to 100 Gal., A774
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From the manufacturer

Product description

Style:E300

The Fluval E Heaters continuously monitor and display aquarium water temperature, ensuring the well-being of your aquarium inhabitants. The E Series features VueTech technology. With the easy to use adjustment lever, the temperature can be precisely set in 0.5° increments. Its LCD display delivers peace of mind by continuously showing real time water temperatures. During normal operation, the temperature readout will change color if the water varies +/-2 degrees F or more from the pre-set temperature. If any external heat sources or other equipment, such as chillers, cause the aquarium water temperature to rise or fall beyond 5.5 °F, the colored screen will flash, indicating a potential risk. The ability to measure temperature in Celsius is also an option. The integrated fish guard offers advanced protection. Fish and invertebrates cannot come into direct contact with the heater core. The glass sleeve is also protected against shocks from large fish species. Built with a secure slim profile mounting bracket, it can be adjusted or removed without removing the mounting bracket. For those with a marine aquarium and sump, you can also attach the Fluval E heater there.

WARNING: The heater must never be operated outside of the aquarium. If the water level falls below the minimum water level MIN, the thermostat can no longer "read” the water temperature and therefore can no longer control the heating correctly. If it has to be taken out of the water or when transferring or changing the water, disconnect the heater from the power source and wait for at least 30 minutes to allow it to cool down.

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.

Product information

Style:E300

Technical Details

Additional Information

Warranty & Support

Product Warranty: For warranty information about this product, please click here [PDF ] Please read the USER MANUAL for Instructions and Directions of Usage [PDF ]

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Important information

Directions

The Fluval Advanced Electronic Aquarium Heater is a highly accurate, safe and feature rich heater for your aquarium. With easy to adjust temperature controls, you can quickly and precisely set in 0.5° increments. An integrated fish guard insures fish and invertebrates cannot come into contact with the heater core. With VUE Tech Technology, you can check the temperature of your aquarium anytime, in either Celsius or Fahrenheit, on the LCD display. The temperature readout will change color is the aquarium water varies =/-1°C or +/-2° F or more from the pre-set temperature. If the temperature is of the water is affected by outside equipment and causes the aquarium water to rise or fall beyond 3°C or 5.5° F, the colored screen will flash indicating potential risk. Highly precise, safe, and reliable heater for your aquarium For 375 L, 100 U.S. Gal tanks

Wattage

300 watts

Bulb Voltage

230 volts


Customer Questions & Answers

Customer reviews

4.4 out of 5 stars
4.4 out of 5
2,049 global ratings

Top reviews from the United States

Reviewed in the United States on February 2, 2019
Style: E300Verified Purchase
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4.0 out of 5 stars Great heater, but must follow some steps to get it working perfectly:
By Elena on February 2, 2019
Great heater and very precise. Its within .5 degrees of my thermometers. There are a few steps one must follow in order to get it working correctly. I wish Fluval would update their manual, as setting up this heater vertically per their instructions is wrong. Their support will tell you updated instructions on how to set it up correctly if you contact them...

Here is what I did so it worked flawlessly:

1- It HAS to be mounted in a 45 degree angle, and with the bottom end pointing towards your filter intake. If you can also point your filter's output to push water towards it, even better. Look at my picture and you will see how I have it, and absolutely NO "Low flow" messages at all.

2- Let it rest in your aquarium for about 20 mins, then plug it in and wait around a minute before setting any temps (it does a self test and goes thru some heating on and off to calibrate itself).

3- Don't expect it to heat your aquarium right away. Its a very gentle heater. It took it around 2 days to finally take my 65 gallon tank to the desired temp (it wasn't that bad, as I had filled it up with water within 2 o 3 degrees off from the desired temp, which is what Fluval recommends in their manual), so make sure your water is close to the temp you want. Once it reaches the desired temp, it turns green and the temperature stays there, no variances unlike other heaters (granted you followed N#1).

4- I know its a lot of things to do compared to "dumb" heaters, but trust me, once you get it working ok, its the best, most accurate heater I've had (I've had eheims, marinelands, etc). Since its a smart and very VISUAL heater, it will tell you everything is going on, so don't be surprised if it stays blue or red for a long time, little changes in temps, and it will let you know. Don't let this worry you, we are used to "dumb" heaters that only have a on/off light, you think they're working, but they are not telling you if your water is down 2 degrees off, or other things like this one.

Hope the above helps, and again, took one star down, only because its Fluval's fault for not printing a better manual, that explains the points above, and waiting for customers to contact them/complain to finally send an email explaining those things.
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133 people found this helpful
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Reviewed in the United States on May 11, 2018
Style: E300Verified Purchase
45 people found this helpful
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Reviewed in the United States on March 30, 2018
Style: E300Verified Purchase
24 people found this helpful
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Top reviews from other countries

Rebecca H.
3.0 out of 5 stars 2 pin plug from Amazon.co.uk
Reviewed in the United Kingdom on March 17, 2018
Style: E300Verified Purchase
Customer image
3.0 out of 5 stars 2 pin plug from Amazon.co.uk
Reviewed in the United Kingdom on March 17, 2018
I love this heater have owned it for several years and as long as you have good flow then it maintains a great temp.
However be aware I ordered from
Amazon.co.uk and it comes with a 2 pin plug.
Phoned and explained I am ordering from Amazon direct uk to the UK and expect a UK plug... i was offered an adaptor..
A replacement was eventually ordered and once again arrived as a 2 pin plug. So yet another day wasted waiting for delivery and fish tank suffering.. . Off out now to purchase from elsewhere. However disappointed that a direct Amazon order has let me down.. I usually find Amazon direct items a little more expensive but more reliable.
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26 people found this helpful
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Sarah708
4.0 out of 5 stars Thank goodness for advice in other reviews.
Reviewed in the United Kingdom on September 21, 2017
Style: E300Verified Purchase
10 people found this helpful
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Cath0794
1.0 out of 5 stars Doesn't maintain temperature
Reviewed in the United Kingdom on December 28, 2020
Style: E300Verified Purchase
One person found this helpful
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Michael White
5.0 out of 5 stars Reliable, with no issues
Reviewed in the United Kingdom on December 28, 2020
Style: E300Verified Purchase
Jidl1810
1.0 out of 5 stars Disappointed
Reviewed in the United Kingdom on December 5, 2019
Style: E300Verified Purchase
2 people found this helpful
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