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Fluval E 300 Watt Electronic Heater

4.4 4.4 out of 5 stars 3,297 ratings

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E300
Heater

Purchase options and add-ons

Brand Fluval
Color Blue
Form Factor Aquarium Heater
Indoor/Outdoor Usage Indoor
Product Dimensions 1.8"D x 3.3"W x 18.2"H
Power Source
Corded Electric
Heating Method
fan & forced air, Convection
Item Weight
0.37 Kilograms
Heat Output
300 Watts

About this item

  • 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
See more product details

Customer ratings by feature

Suction power
4.4 4.4
Accuracy
3.9 3.9
Temperature Control
3.7 3.7

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Product information

Technical Details

Additional Information

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
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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Fluval E 300 Watt Electronic Heater


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From the manufacturer

Fluval E Electronic Heater

E-Series digital heater offer dual-sensor VueTech microprocessor technology, which continuously displays accurate water temperature and visually alerts the user of any fluctuations.

  • 300-Watt heater designed for aquariums up to 100 gallons
  • Displays water temperature digitally in Celsius or Fahrenheit
  • Precision temperature control allows for increments (+ or -) of 0.5 degrees
  • VueTech system will change display colors if set temperature varies +/- 1°C or +/- 2°F (blue = low, green = safe zone, red = high)
  • Integrated fish guard provides added protection
  • Slim mounting bracket
  • For use in freshwater and saltwater aquariums

Looking for specific info?

Product guides and documents

Product 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.

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. 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. The advanced E Heater microprocessor detects and displays some abnormal or nonoptimal usage conditions, which require verification and proper action by the owner. The possible error codes are the following: E1 - The “E” Heater has gone into error status and has removed power from the heating element. This error status can only be reset by unplugging the unit. Possible Cause and Solution: The “E” Heater has detected an abnormal usage condition. Unplug the heater. Check that all application conditions are correct according to the instructions, including the respect of the MIN water level. Start up the heater again following the “Installation” instructions above. LF - The “E” Heater will keep on operating, although its proper operation is inhibited due to poor water circulation around the heater. The error status will be automatically reset once adequate water circulation around the heater has been provided and the heater has had time to recalibrate itself. Possible Cause and Solution: The “E” Heater has detected poor water circulation around the heater. The even and thorough distribution of warmed water inside the tank could be limited by the inadequate circulation. Ensure adequate water circulation around the heater and inside the aquarium. Verify installation conditions outlined in the “INSTALLATION” instructions.

Wattage

300 watts

Bulb Voltage

230 volts

Customer reviews

4.4 out of 5 stars
4.4 out of 5
3,297 global ratings

Customers say

Customers like the heat of the space heater. They say it has an excellent temperature display with color coding to let you know danger zone temps. They are also happy with ease of use, and readability. However, some customers have reported issues with the flow of the water. They mention that it does need some flow. Customers disagree on temperature control, value, quality, and performance.

AI-generated from the text of customer reviews

73 customers mention70 positive3 negative

Customers find the space heater easy to use. They say it's easy to set, operate, install, and read. They appreciate the intuitive design and color coding. Customers also mention that the controls are easy to adjust.

"...if you need to mount the thermometer in an angle it’s easy to do with the adapter bracket...." Read more

"...Easy to set with no guessing involved...." Read more

"...The temperature adjustment is perfect. It is easy enough for a human to adjust the temperature, but it does take a little pressure, which ensures..." Read more

"...Easy to use and the suction cups are great." Read more

63 customers mention63 positive0 negative

Customers find the built-in tank temperature display easy to read. They say the digital display is clear and vivid, making it easy to see what your current tank temperature is. Some mention that the display is large and easy to set. Overall, most are satisfied with the readability of the space heater.

"...it displays at all times. Easily read from a distance. The guard is also a great touch. It really looks great in tank...." Read more

"...and it intelligently displays your water temperature in a clear and vivid display which is visible from any angle.Update:..." Read more

"...The digital display is easier to read than a normal tank thermometer...." Read more

"...The display makes it very easy to see what your current tank temp is...." Read more

61 customers mention61 positive0 negative

Customers are satisfied with the heat of the space heater. They mention that it has an excellent temperature display with color coding to let them know danger zone temps. They also appreciate the color changing LED on the temperature that makes it as simple as a glance to know if the water temperature is in the right range. Customers also love the different color displays for quick reference, and the digital readout and the colors to visually warn if temperature is out of range.

"...I really love the large bright temp. it displays at all times. Easily read from a distance. The guard is also a great touch...." Read more

"...It heats your water and it intelligently displays your water temperature in a clear and vivid display which is visible from any angle...." Read more

"...With this heater it is SET and FORGET. With the color changing display you know what it is doing, or more so if there is a temp change more..." Read more

"...Once set they were great for a while. I love the different color displays for quick reference if I’m in the right temp range...." Read more

397 customers mention222 positive175 negative

Customers are mixed about the temperature control of the space heater. Some mention that the temperature adjustment is perfect, it ensures the temperature remains accurate, and reduces the number of on/off cycles the heater goes through. However, others say that it will not reach the temperature they wanted, the water will get too hot around the heater tube, and that they have yet to see an accurate temperature reading.

"...Also, setting the temp could not be easier. I mean easy!! Greatest invention...." Read more

"...I think that since the heater is covered with the shroud, the water will get too hot around the heater tube itself, keeping it from cycling like it..." Read more

"...It heats your water and it intelligently displays your water temperature in a clear and vivid display which is visible from any angle...." Read more

"...the agles attachment lets you veiw the display. All in all, Very good, accurate heater, great display, great warnings if temp changes...." Read more

299 customers mention194 positive105 negative

Customers are mixed about the performance of the water heater. Some mention that it works great for a months, while others say that it has not worked well. They say that the circulation pumps works well, and the filter suction and the pump works well. However, some customers report that the heater stopped working correctly, and that the thermostat part is not functioning.

"I like the ruggedness of the protective housing which completely covers the body of the heater...." Read more

"...of getting one of these do not hold back, In my opinion they work very well and you will be glad you did." Read more

"...It really looks great in tank. The first one I purchased was not working and I was upset because I really loved the look...." Read more

"...The suction cups are still pliable after 6 months and have not disintegrated. If placement was not such an issue, I would have given this 5 stars...." Read more

164 customers mention91 positive73 negative

Customers are mixed about the quality of the space heater. Some say they love the design, it has a very nice digital display, and their fish look very happy since then. However, others say that it's inconsistant, has

"I must say it is dead accurate and a very nice looking heater. I really love the large bright temp. it displays at all times...." Read more

"...is that it needs to be near high water flow or you’ll get error messages on the display." Read more

"...veiw the display. All in all, Very good, accurate heater, great display, great warnings if temp changes...." Read more

"...The LF error...." Read more

73 customers mention50 positive23 negative

Customers are mixed about the value of the space heater. Some mention that it's well worth the price, while others say that it is a bit pricey.

"...Price was amazing for this size. Just remember to place in tank for at least 20 minutes before you plug it in...." Read more

"...These heaters can be had for a good low price at Amazon, even if price is more than a "old style" glass tube heater, pay the extra and..." Read more

"...EDIT: Just ordered a 3rd. The price keeps going up! Still amazed the display says 77.5 and another therm says 77.5. Exact...." Read more

"...Overall, showed up timely, good, secure packaging, fair price, good quality heater... I would definitely purchase another one if necessary......" Read more

53 customers mention12 positive41 negative

Customers are dissatisfied with the flow of the space heater. They mention that it constantly gives a low flow error, and that it needs a certain amount of water flow around the heaters. Some say that the sensor is a little sensitive.

"...Only downside is that it needs to be near high water flow or you’ll get error messages on the display." Read more

"...I found that meant low flow around the heaters. The vents were covered quite a bit. I scrubbed them and reinstalled them...." Read more

"...This guy will start to complain (displaying No Flow error sign)..." Read more

"...If "LF" is a problem, it's relatively easy to fix. Circulation is important, esp...." Read more

Great heater, but must follow some steps to get it working perfectly:
4 Stars
Great heater, but must follow some steps to get it working perfectly:
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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Top reviews from the United States

Reviewed in the United States on April 9, 2013
Style: E300Pattern Name: HeaterVerified Purchase
Reviewed in the United States on August 3, 2020
Style: E300Pattern Name: HeaterVerified Purchase
Customer image
5.0 out of 5 stars Reliable and accurate
Reviewed in the United States on August 3, 2020
I like the ruggedness of the protective housing which completely covers the body of the heater. Furthermore, it’s intelligent display is easy to read and understand. Green if the water is at the optimal temperature, blue if your low and red if your above the set temperature. It also comes with an adapter so if you need to mount the thermometer in an angle it’s easy to do with the adapter bracket. The suction cups are strong and hold the entire housing in place with no problem. I have the E300 in my freshwater 75 gallon tank and it keeps it at 78*F with no problem. Another thing I like about the unit is that is like having a Thermometer and Heater all in one. It heats your water and it intelligently displays your water temperature in a clear and vivid display which is visible from any angle.

Update:
So I’ve had the heater for 11 months and have learn a couple of things which will help keep its efficiency. Once a month ensure to clean the entire protective housing with a tooth brush to remove any debris which may get lodged; and once every three months remove the outer protective plastic grill / cover and wiped down the glass shaft of the heater to remove all the build up of algae and milk on its outer surface. If you don’t the sensor inside is unable to sense the water flow and the heater will display the “LF” trouble code on the screen. LF stands for “Low Flow.” Cleaning the glass housing every three months prevents this from happening.

Thus, I would highly recommend this heater.
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Reviewed in the United States on April 8, 2012
Style: E300Pattern Name: HeaterVerified Purchase

Top reviews from other countries

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Cliente de Amazon
5.0 out of 5 stars Muy buena calidad
Reviewed in Mexico on January 15, 2024
Style: E300Pattern Name: HeaterVerified Purchase
GARY J.
5.0 out of 5 stars Excellent product
Reviewed in Canada on January 12, 2024
Style: E300Pattern Name: HeaterVerified Purchase
Torsten
5.0 out of 5 stars Besser als sein Ruf
Reviewed in Germany on March 15, 2024
Style: E300Pattern Name: HeaterVerified Purchase
Paul B.
5.0 out of 5 stars I own one
Reviewed in the United Kingdom on February 7, 2024
Style: E300Pattern Name: HeaterVerified Purchase
Joakim Sternborn
5.0 out of 5 stars Bästa doppvärmaren till bästa pris
Reviewed in Sweden on May 7, 2023
Style: E300Pattern Name: HeaterVerified Purchase