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Fluval E 300 Watt Electronic Heater

4.4 4.4 out of 5 stars 3,326 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Aquarium Heaters by Fluval
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E300
Heater
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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
4.3 4.3
Accuracy
3.9 3.9
Temperature Control
3.7 3.7
See all reviews

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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

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

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Fluval E 300 Watt Electronic Heater

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Product guides and documents

User Manual (PDF)
User Guide (PDF)

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.

Top Brand: Fluval

Highly Rated
100K+ customers rate items from this brand highly
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100K+ orders for this brand in past 3 months
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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. 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
3,326 global ratings

Customers say

Customers like the ease of use of the space heater. They mention that it's easy to set, operate, and read. They also like the readability, and heat. However, some customers are disappointed with the flow. Opinions are mixed on temperature control, performance, quality, and value.

AI-generated from the text of customer reviews

74 customers mention71 positive3 negative

Customers find the space heater easy to use. They mention that it's easy to set and operate, with no guessing involved. They appreciate the intuitive design and color coding. Customers also mention that the controls are easy to adjust.

"...order and picked up this heater and it’s been amazing so far, super easy to operate, love the built in thermometer, keeps my tank at a stead 80." 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

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

63 customers mention63 positive0 negative

Customers find the digital display on the space heater easy to read. They say it's 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.

"...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

"...Visual color clues on the water temperature that will get you quick answer on the state of your fish tank-..." Read more

"...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,..." Read more

61 customers mention61 positive0 negative

Customers are satisfied with the heat produced by the space heater. They like the 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. Overall, customers are happy with the product's heat.

"...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

"...some really nice days I appreciate it even more because it flashes a differerent color and lets me know the tank is higher than the level I wanted..." Read more

"...heats QUICK. A 37 gallon cold tank was 77.5 the next morning...." Read more

401 customers mention226 positive175 negative

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

"...and it’s been amazing so far, super easy to operate, love the built in thermometer, keeps my tank at a stead 80." 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

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

"What I like most about this heater is that you can watch your temperature real time on the screen. I have found it to be spot on accurate...." Read more

299 customers mention192 positive107 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. Some say that the circulation pumps works well, while other say that their secondary heater was working much harder than usual. Overall, the opinions are mixed, and it's recommended to read the reviews carefully before making a purchase.

"...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

"...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

"...be set in a spot that has water flowing over it though, or it will not work correctly...." Read more

"I have been using this product for about 4 months and it has worked great...." Read more

166 customers mention92 positive74 negative

Customers are mixed about the quality of the space heater. Some mention that they like the design, it has a very nice digital display, and it's well-engineered. However, others say that it'll be inconsistent and has several design flaws.

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

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

"I like the idea I can set and see the temperature. I also like the design...." Read more

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

73 customers mention50 positive23 negative

Customers have mixed opinions about the value of the space heater. Some say it's worth the price and saves money, while others say it’s a bit pricey.

"...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

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

"...I highly recommend this heater as a cheaper, high-quality alternative to a temp controller." Read more

54 customers mention12 positive42 negative

Customers are dissatisfied with the flow of the space heater. They mention that it constantly gives a low flow error. They also say that it needs a certain amount of water flow around the heaters or it will display a No Flow error sign.

"...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

SeaAK
5.0 out of 5 stars Works awesome in my 120 gallon tank
Reviewed in the United States on March 19, 2024
Style: E300Pattern Name: HeaterVerified Purchase
I had initially ordered a different heater, which was a dud.

Made a new order and picked up this heater and it’s been amazing so far, super easy to operate, love the built in thermometer, keeps my tank at a stead 80.
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Mike V
5.0 out of 5 stars Great Heater
Reviewed in the United States on April 8, 2012
Style: E300Pattern Name: HeaterVerified Purchase
I got this heater for my 55gal a few months ago, and I love it.

It does have to be set in a spot that has water flowing over it though, or it will not work correctly. When I first put it in my tank, I thought it was in a spot that had some current, but it wasn't enough. The temp went from 77 down to 72 over night like some of the previous posts stated, so I thought, as other did that it was junk.

I then re-arranged the configuration so that my spray bar for my canister filter pointed the output directly across the heater, and its been a constant 77.5 degrees ever since. It will fluctuate slightly (maybe a single degree at the most) if the house gets cold over night, or the house gets hot on a hot day, but I think that would be the case with any heater.

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 normally would if it wasn't covered, thus causing the overall temperature in the rest of the tank to drop. It seems to me that if they designed it so that you have the option of taking off the cover, it wouldn't need the current to take the warmed water away from the heater tube. I have had several heaters over the years with the same wattage that didn't have a cover, and I don't remember any of them burning my fish.

Overall, its a great heater if you set it up according to the directions. Its nice to have a good digital thermometer telling me what the temp of the water is, which is why I bought it in the first place.
2 people found this helpful
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Fish 123
5.0 out of 5 stars GREAT HEATER
Reviewed in the United States on April 11, 2012
Style: E300Pattern Name: HeaterVerified Purchase
I read many reviews before I made my mind up on this heater. I will say I am sold on FLUVAL, as I currently own 2, 306 filters, 2, Q2 air pumps, and lastly 1, E200 and one E300 heater. I could not make up my mind with the first E200 or go with a E300 for a 55, I have two, am happy with both so this is about both since nothing but capacity changes with them, functions are the same.
I can say, I had the old school type heaters, which seemed ok but had a hard time setting my temps just right. You know the drill, set the dial and wait a day, turn it back some, turn it up some, what a waste. 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 than 1 degree, it lets you know. I do have thermometers, the strip kind, I know I should get the real ones, howerver as the Fluval gives a real time, real temp display I do not think I will, I have also and do still, since these are new to me, check with a laser temp meter, so far both are to with in half a degree of the setting,
Yes they do need water flow to work, so if you have HOB filter they would need to be close to that, I use canister filters with spray bar, so no problem there.
One BIG plus for me, in my thoughts is the gaurd that keeps my fishes from rubbing up against a hot tube and burning themselves.
The side mount is also usefull, as I have it on one of my tanks, my fish like the corner I would like to put it in, best second location is to the front, and the agles attachment lets you veiw the display.
All in all, Very good, accurate heater, great display, great warnings if temp changes. I am so far happy with this unit, Hope if you a thinking of getting one of these do not hold back, In my opinion they work very well and you will be glad you did.
2 people found this helpful
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spy8464
5.0 out of 5 stars Wow! This was worth it.
Reviewed in the United States on March 27, 2024
Style: E300Pattern Name: HeaterVerified Purchase
What I like most about this heater is that you can watch your temperature real time on the screen. I have found it to be spot on accurate. I have teemed it up with an ink bird temperature controller. With these 2 things working together, I have a level of confidence regarding the temperature and safety of my little fishy friends. I now have confidence that my aquarium is not going to dail me. I absolutely love this heater. Being able to look into the aquarium and see the blue, green or red light means everything. I have a camera set up on my aquarium so that I can watch It from a far. And what's great now. Is that I can see that light and understand exactly where the temperature is? And what is going on regarding temperature in my aquarium.
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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
Súper precio
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Brett
5.0 out of 5 stars technology
Reviewed in Canada on August 16, 2023
Style: E300Pattern Name: HeaterVerified Purchase
i seem to favour fluval products as they work well and have excellent colours, and i have been using them for 40 years now. this heater has ended the guessing game of me knowing the water temperature of my aquarium. it heats well and tells me if it’s to high or low by colour, this feature is awesome. i really appreciate that it blends in well with my aquarium, no ugly heater to look at here.
Customer image
Brett
5.0 out of 5 stars technology
Reviewed in Canada on August 16, 2023
i seem to favour fluval products as they work well and have excellent colours, and i have been using them for 40 years now. this heater has ended the guessing game of me knowing the water temperature of my aquarium. it heats well and tells me if it’s to high or low by colour, this feature is awesome. i really appreciate that it blends in well with my aquarium, no ugly heater to look at here.
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One person found this helpful
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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
Bästa doppvärmaren jag köpt
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Pietro P.
5.0 out of 5 stars Ottimo riscaldatore per acquario con display chiaro e semplice
Reviewed in Italy on April 29, 2022
Style: E300Pattern Name: HeaterVerified Purchase
Utilizzo questo riscaldatore in parallelo ad uno più semplice in vetro.
La regolazione è precisa e semplice. I colori del display permettono di capire immediatamente se la temperatura è in linea con quella impostata, inferiore o superiore!
Ottimo prodotto con la calotta in plastica per proteggere da urti.
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anirban
5.0 out of 5 stars Good product with 99% accuracy..
Reviewed in India on May 6, 2021
Style: E300Pattern Name: HeaterVerified Purchase
After using this product from last 4 months I am writing this review. Great product. Accuracy of this heater is good.
The cost of this product is little bit high..
The seller response was great. I was little bit confused about my product delivery date,so I contacted to the seller.
Trust me they are very polite and very helpful.
They answered my all questions very politely..
2 people found this helpful
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