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Availability:
In Stock.
Arrives
Friday, Oct 16
Size: E300
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
Capacity: 100 gallons
Power Source: Corded Electric
Color: Blue
Wattage: 300 watts
Power Source: Corded Electric
Wattage: 300 watts
Voltage: 230 volts
Heat Output: 300 watts
Mount Type: Slim mounting bracket
Capacity: 100 gallons
Item Weight: 0.37 kg
Material Type: Plastic
Color: Blue
Style Name: E300
Brand Name: Fluval
Model Number: A774
Number of Items: 1
Unit Count: 1 Count
Manufacturer: Rolf C. Hagen (USA) Corp.
Manufacturer 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
Included Components: Fluval Advance Electronic Aquarium Heater (300 Watt)
Item Type Name: HAGEN FLUVAL E 300W HEATER
Manufacturer Part Number: A774
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Oct 16
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.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: E300
Like the reveiwer before me, I was also looking for a reliable heater after I learned the Tronic series had been discontinued. I have had horrible luck in the past with just about every type of heater except for the Tronics, so I was skeptical. However, this heater seems to be a solid build. It amazingly raised my 55 gallon tank water from 72 to 80 degrees F in about 5 or 6 hours and has held steady since. The built-in guard is a plus. I don't think my current fish would be able to crack a glass heater, but it is nice having the guard built-in "just in case." I mounted mine horizontally (but still well above the sand in my tank), which allows me to do my weekly 50% water changes on my overstocked African Mbuna tank without exposing or having to move the heater. This works out well, however, if I take too long refilling, I do get the "LF" (low flow) error. It doesn't seem to want to clear after flow has been restored, so the only way I have been able to clear it is by unplugging the heater and plugging it back in. This is not a complaint, as my tank does definitely have "low flow" when I have it half-emptied, but more a heads up to anyone else who does large weekly water changes. As for the display and the controls, I cannot complain. The display is easy to read, and it is easy to just glance across the room to check it. If it's green, you know everything is fine. 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 that your fish will not be able to adjust it. I am very pleased with this heater. In fact, I just ordered another one today after discovering that my old Tronic in my 46 gallon has some condensation inside the glass tube. I would definitely recommend this heater to anyone who asked me.
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Reviewed in the United States on November 29, 2011 by JenniferL
Size: E300
This heater is great, I love how it has a digital temperature sensor so you can easily see the temperature of the water and how easy it is to adjust the temperature as well. Installation is straightforward like a heaters but this model does have an adjustable mount that lets you adjust it up and down and it also comes with an angle mount so you can place the heater in the corner of the tank. I had to purchase two because of the size of my tank so I wouldn’t have any cold spots but over all great item and very happy with my purchase.
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Reviewed in the United States on May 8, 2026 by Jay Galindo
Size: E300
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.
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Reviewed in the United States on April 11, 2012 by Fish 123
Size: E300
This could be the great heater and maybe Fluval will make it right with the next incarnation. But for now it is still not without some serious issues. First, Pros: - Very accurate digital thermometer - Hard plastic shell that protects heater and fish from harming each other (if you have big aggressive fish in your tank you know how bad it can get) - Visual color clues on the water temperature that will get you quick answer on the state of your fish tank - Easy to set with no guessing involved. The rocker at the top of the heater needs to be pushed and kept to the right to increase temperature by half-degree or to the left to decrease it. The rocker is stiff enough, so that fish can never accidentally readjust the temperature - Two internal thermometers provide some peace of mind in case one fails. Your heater would stop working but at least it will not boil your fish to death. - It is fully submersible. The manual may get you confused by showing that you can not keep it fully under water but the text then mentions that it is fine up to the depth of 100 inches. Please understand, that even fully submersible heaters will eventually develop leaks that will damage internal electronics, so it is not recommended to place them this way unless you are ready with full backup plan. Now for Cons: - No indicator on when the heater is on. You would think that when thermometer indicator turns Blue (water is at least one degree cooler then preset) it would be on until situation is corrected. Well, you would be wrong. This heater works in very short bursts of turning itself on for a 30-45 seconds and then taking a coffee break for a good 3-5 minutes before starting up again. This behavior may work if you only need to keep temperature in the tank at constant, but in situations when you need full power on (think winter, cold room temperature, large tank) it just can't keep up. So, essentially you are buying a 100Watt heater after all the extended breaks are taken into account. - Very finicky about placement in the tank and water flow. Of course, ideally all heaters need to be placed, so that flowing water from the filter constantly washes against the heater. But regular, non-smart heaters are less picky and will get you by. This guy will start to complain (displaying No Flow error sign) quickly if it does not feel sufficient (and I mean pretty strong) current and will turn itself off. - It is not 300Watt, my Amp meter shows that when it's on, it only draws 274Wt (yes, my Amp meter is properly calibrated) - close but no cigar
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Reviewed in the United States on November 15, 2011 by netscorer
Size: E300
Zero stars. I have this in a 75 gallon planted tank with LOTS of driftwood and deep substrate so there is MAYBE 65 gallons of water total. Bought the E300 rated for 100 gallons. Let me count the ways I hate this useless heater that cant do its job on a tank half the size its rated for: 1 - Does not get anywhere near set temperature in a room where ambient temps are a steady 72 F. I had it set for 77, it got to about 73 or 74. Thats only 1 or 2 degrees warmer than the room. I can rub two sticks together and get more heat than that. 2 - Because it does not heat water properly, the display flashes a bright neon blue forever that is so bright it throws blinking shadows all over the room at night. I cannot emphasize enough HOW HORRIBLE AND ANNOYING THIS FEATURE IS. Think trashy motel room with blue neon lights blinking in through the window that keep you awake forever. Its SO RIDICULIUSLY BRIGHT. Put a resistor in there guys so I dont feel like a movie villian hiding out in a Las Vegas motel. Holy cow. 3 - It does not matter where you put this heater, it will also flash LF in bright neon blue indicating water is not moving around it. I even dangled it DIRECTLY IN THE OUT FLOW OF THE FILTER AND IT STILL FLASHED LF! Next to the intake, in the churning corner, floating directly in the flowing water shooting out of the filter, none of it mattered, neon blue LF flashed on this piece of garbage wherever I put it. 4 - The housing. Horrible. Looks like it will protect fish and plants, actually just makes it impossible to secure the heater to the tank where you want it. 5 - The toggle switch used to set the temperature is horrible. Its like trying to steer a car that is supposed to have power steering but doesnt and it makes tapping the temperature setting up or down a horrible pain...not that it matters anyway because IT DOES NOT HEAT THE WATER. 6 - Oh yeah, IT DOES NOT HEAT THE WATER, so much so that my fish literally have to camp on it. So at least it gets mildly warm or something? Lol. 7 - Its expensive and I could have just got a simple glass cased heater that doesnt light up my room like a flashing neon sign for like half the price. Garbage. I want my money back. Had aquariums for over 15 years. This thing is a standout...in all the wrong ways.
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Reviewed in the United States on May 12, 2024 by steve t
Size: E300
March 2026 Update: This heater is still going strong with no signs of problems. Forget about the negative reviews, it's mostly user error. Original Review: To start off, I don't get all the 1 star reviews. If LF is a problem, it's relatively easy to fix. Circulation is important, esp. in larger tanks, so that the water is the same temperature everywhere. I've been using this 300 watt heater for about 3 weeks now and so far, I'm pretty impressed. I have a 55 gal freshwater tank with an eheim canister filter, that has the inlet on one end of the tank and the outlet via spray bar on the other end of the tank. My old heater wasn't working right anymore and my tank temperature had been around 76.5°F until I got the new heater. I followed the instruction to allow the heater to adjust first to the ambient water temperature, before connecting it to power. I then set the temperature to 78°F. Placed it in the immediate vicinity of the spray bar in hopes to get the water circulation that this heater requires. Well, that wasn't working so great as it started displaying LF (low flow) about 15-20 minutes into warming up the water. So I moved it to sit in the bubbles of an aeration bar sitting against the back wall of the tank. And voila, just like that, LF problem solved. :) Temperature in my home has been varying - NE Florida spring weather is unpredictable and my house goes from 68 to 78 all the time. The heater has been consistently keeping the temperature within half a degree of its set value. I love the ease of setting the temperature with the swivel knob at the top and the digital temperature display is a neat feature. I have a separate digital thermometer to verify the heater performance. So far it has been spot on. It's fully encased, so tank inhabitants are safe from harm. A definite step up from the hard to adjust and unreliable heaters I've previously owned. I will post photo/video later and update this review if anything changes.
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Reviewed in the United States on March 30, 2018 by Some Blue Devil
Size: E300
After reading the reviews and studying other internet sites I decided to go ahead and try this heater. I love the built in heater guard. Anyone that has cichlids knows they tend to be a little on the rowdy side and can destroy a heater! This is a great idea to integrate it with the heater itself. I have had no problems at all with the heater maintaining the temperature of the aquarium. I went ahead and bought the 300 Watt for my 55 gallon. It is very, very easy to set the desired temperature. The old heater I had was not maintaining the temperature so the water was actually about four degrees cooler than desired when I put this heater in the tank. I let it acclimate and then plugged it in. It easily raised the temperature to what my cichlids need. To address some of the complaints that others have given regarding this heater: It IS fully submersible. I have it well below the water-line in my tank. The LF error. This is from the Knowledge Base from the Hagen support: "When the LF or "Low Flow" appears on the LCD screen the "E" heater is detecting poor water circulation around the heater. The sensitivity of the system has realized that the water immediately surrounding the heater has become too warm in relation to the heating cycle. While the "LF" appears the heater continues to operate but it is important to note that the even and thorough distribution of warmed water inside of the aquarium could be limited by poor circulation. To rectify the situation improve the water circulation around the heater and inside the aquarium by redirecting the outlet of a pump or filter so that the heater is in the direct path of the water stream. Provided that the LF display is temporary and that the E1 display is not showing then this is perfectly normal and nothing to be concerned about." I did get this error. In my particular aquarium I found that a diagonal position underneath my HOB Fluval C4 filter (with the bottom tilted toward the intake and the top under the overflow) eliminated the error. It is just a matter of finding the circulating current in your aquarium. I would note that having had aquariums for many years that all heaters do work in this same exact manner, it's just that this one actually has a sensor that tells you that your heater is not optimally placed. I will try to update later with a picture. All in all a very good heater and I plan on buying another.
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Reviewed in the United States on January 8, 2012 by Terri M
Size: E300
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 August 3, 2020 by Carlos Gonzalez