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This item is eligible for return within 30 days of receipt
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Availability:
In Stock.
Arrives
Tuesday, Nov 17
At a glance
- Condition
- New
- Size
- E200
- Model
- A773
- Dimensions
- 2"D x 1.25"W x 13.75"H
- Weight
- 0.39 kg
- Color
- Black
- Special Features
- Energy Efficient
- In the box
- All Items listed in Description
- Warranty
- 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.
Features 5
- Accurate and Real-Time Monitoring: Fluval E series are among the most sophisticated aquarium heaters available today. Water temperature is continuously monitored and communicated using a simple-yet-effective color-coding system.
- VueTech Temperature Control: LCD screen changes color to show Safe Zone temperature and High/Low fluctuation alerts (variation of 1 degree C or 2 degrees F). If water temperature changes beyond 3 degrees C or 5.5 degrees F, the screen will flash.
- Electronic Precision: E-Series aquarium heaters have microprocessor technology with dual sensors that provide accurate and real time water temperature readings.
- Trusted Reliability: Fast heating technology is built with a safety shut-off and integrated fish guard to protect fish and invertebrates.
- Additional Features: Equipped with a slim profile mounting bracket that can be attached or removed from the heater.
Description
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.
Specs 30
| Special Features | Energy Efficient |
|---|---|
| Form Factor | Pedestal |
| Indoor Outdoor Usage | Indoor |
| Power Source | Plug |
| Heating Method | Forced Air |
| Recommended Uses For Product | Aquarium heater |
| Mounting Type | Suction Cups |
| Room Type | Bedroom, Basement, Office |
| Heating Coverage | 65 square feet |
| Heating Element | Radiant |
| Heat Output | 100 watts |
| Fuel Type | Electric |
| Number of Speeds | 1 |
| Voltage | 230 volts |
| Amperage | 0.87 A |
| Min Temperature Setting | 68 °F |
| Max Temperature Setting | 2 °F |
| Color | Black |
| Brand Name | Fluval |
| Model Number | A773 |
| Number of Items | 1 |
| Item Highlight | 100-Watt Heater for Aquariums |
| Unit Count | 1 Count |
| UPC | 015561107730 |
| Global Trade Identification Number | 00015561107730 |
| Item Type Name | HAGEN FLUVAL E 200W HEATER |
| Manufacturer | Rolf C. Hagen (USA) Corp. |
| Part Number | A773 |
| Item Dimensions D x W x H | 2"D x 1.25"W x 13.75"H |
| Item Weight | 0.39 kg |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Nov 17
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
Fluval E 200 - Best Aquarium Heater I've Ever Owned
Size: E200
First off, I'm a Mechanical Engineer with 31 years of experience and have a considerable amount of experience related to heat transfer. I've also kept aquariums for 36 years and currently have 3. I've had a Fluval E 200 watt heater in a 75 gallon tank for almost 3 years and it's performed flawlessly. I've read tons of reviews stating the low flow warning is a problem, but that warning is an attribute of this heater. Tank heaters are very compact for the amount of heat they generate and must exchange the heat to their surroundings efficiently or they'll burn themselves out. Just imagine grabbing an old fashioned 100 watt incandescent light bulb that's been on for several minutes .... now imagine that it's a 200 or 300 watt bulb! Also think about the fact that the largest portable space heater you can buy and plug into a standard 120 Volt wall receptacle is 1500 watts. That'll give you a perspective of how much energy 200 or 300 watts is. So yes, you absolutely need water flowing over the heater to carry heat off as opposed to it only heating the immediate area and then shutting off. My 75 gallon tank is fully covered and is in my basement which is typically 63 - 66 degrees in the winter and this 200 watt heater has always kept it within 1/2 degree of the 77 degree setting. I've had many different tank heaters through the years and will never buy anything but these again. As many others have said, being able to just glance over and see the green display indicating that the water temp is within 2 degrees of set point is very nice! I literally look at it every night before going to bed and casually glance at it during the day without even focusing on what the temp actually is. I'm sure many have had defective units but these heaters are wonderful when functioning properly. Oh and I put zero value into reviews stating any heater won't work when the operating conditions aren't given. How many gallons is the tank, what's the ambient air temp, is the aquarium fully covered, etc, need to be known to evaluate whether sufficiently sized. Putting a 1500 watt heater in a well insulated 300 square foot room in your house will keep it toasty; putting that same heater in your outdoor shed in the winter ..... won't help much. One last thing, I'm absolutely not a fan of putting a heater that's considerably larger than required in a tank as I've seen advised many times. All heaters will eventually fail and if it fails in the on mode, I don't want to cook my fish. I'd much rather have 2 smaller heaters in a tank than 1 over sized heater. That way if one fails and won't shut off, the other heater either won't come on at all, or will intermittently cycle to make up what the stuck heater can't do. Heaters are designed to work and will last just fine even if they run a majority of the time. In fact many products will actually last longer if they can just run as opposed to "short cycling" as when they're considerably over sized. I have a Clown Loach that's between 8 - 10 years old and I have no intention of allowing a faulty heater to kill it or any other fish under my watch.
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Reviewed in the United States on December 23, 2018 by Keith B
⭐️⭐️⭐️⭐️⭐️ Precise, stable heating with excellent safety features
Size: E200
The Fluval E200 electronic heater has been rock solid in my aquarium. What really sets it apart is the temperature stability and accuracy. Once set, it maintains the water temperature extremely well without noticeable swings, which is critical for fish health. The digital display is clear and easy to read, and I appreciate being able to adjust the temperature precisely instead of guessing with a dial. The heater reacts quickly when the temperature drops and shuts off properly once the target range is reached. Build quality feels premium and well thought out. The protective casing adds peace of mind, especially in tanks with active fish. It also feels safer than traditional glass heaters thanks to its internal safety features. Pros: • Very accurate temperature control • Clear digital display • Stable heating with minimal fluctuation • Strong safety design and quality build • Ideal for medium to larger aquariums Cons: • Higher price than basic heaters • Takes a bit of space in smaller tanks Overall, this is a reliable, high-quality heater that’s worth the investment if you care about consistency and safety. Perfect for anyone upgrading from basic heaters or running a larger, more sensitive setup.
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Reviewed in the United States on December 23, 2025 by Ahmed Radhy
Working well.
Size: E200
I've gone through a number of heaters and, so far, this one is working better than the rest. On the plus side, this keeps the temp within +/- .5 degree (F) of where I set it and doesn't fluctuate much at all. Since that's what I want out of a heater, this one fits the bill. The LED back-lit LCD display is nice and makes checking the temp very handy with just a glance at the color. The microprocessor control makes setting the temp easy, as well. A flick of the switch in either direction will alter the setting by .5 degrees (F). Although not advertised as such, based on my research, I'm using mine fully submerged without issues. I read about issues with these being underpowered, but in my 29 gallon high, the 200 watt works great. My water is at a steady 77.2 degrees. The plastic guard is a unique feature and, I suppose, helps make sure no fish get injured. But, I've never had that issue, so I think it's more about aesthetics than anything else. On the negative side, this is definitely larger than most other heaters of a similar rating. As you are not supposed to use it in a horizontal configuration, it might be too long for shallow aquariums. While the built-in thermometer is very steady, it's not accurate. Mine is approximately 2 degrees low. At the factory default of 77, my water temp was 79.3 based on both my digital thermometer and standard glass thermometer. Turning it down to 75 is fine, but since it will reset to 77 automatically after being powered off (or a power outage), that's somewhat annoying. Overall, this is one of the better heaters I've used. If the thermometer were more accurate, I'd give it 5 stars.
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Reviewed in the United States on November 1, 2013 by DeeJay
Great heater, but with a few little quirks...
Size: E200
I read every review (on multiple websites) about this particular heater before I decided to buy it. However, when it arrived there was still a few things I was thoroughly confused by. So here is some information that I really could have used to ease my worry and confusion. First of all, my turtle's tank can hold up to 70 gallons, but I only have about 35-40 gallons of water in it. And it took almost 2 full days of being submerged before the blinking blue light finally changed to green permanently. No review I've yet to read said it should take this long. Neither did the instructions. From what I gathered it should take between 4-6 hours at the most. So I thought mine was defective! Even though I was worried it wasn't working, I still managed to wait a few days in spite of myself. I'm glad I did! My worries (I mean; checking on the blinking blue light constantly) and my impatience with the whole process was for nothing. And it works great! Once the heater reached the desired temp I set it for. It has remained solid green, and the blinking blue light was/is no more. As for the temp, it does fluctuate between 1-2 degrees lower than the setting every now and again. Although not a big deal whatsoever... Overall, it's a good quality heater. I'm pleased to report that its never overheated once, nor burned my house down. And all is well, indeed :)
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Reviewed in the United States on January 2, 2012 by AmorVincitOmnia831
Great color coded display
Size: E200
Have this heater now in my fish tank for about a year. The heater itself has a glass housing. The outer casing visible in the picture is plastic. That's great to avoid any fish getting burned by the heater. Target temperature adjustment is straight forward following the instructions. I strongly doubt that any fish could change the adjustment (done by the little red lever which, granted, is in the water as well) as I had read somebody else posting. I use the heater fully submerged. One thing to be aware of is that the heater needs to be in "flowing" water when being mounted vertically. Otherwise the built in temperature sensor will get triggered and report an error (rising warm water will create and "overheat" condition which switches off the heater). I don't have much water flow in my fish tank so I decided to mount the heater horizontally an inch or two above the gravel. Works perfectly this way. The best part of the heater is the color coded built in temperature display. As long as the water has a temperature within one or two Fahrenheit of the target temperature the display is green. If the water temperature rises the display becomes red (while of course also displaying the exact temperature as a number). If rising an additional few degrees the display blinks red. Similarly if the water temperature goes below the target range the display becomes blue. This way one can quickly check that the water has the right temperature. Update Aug 2013: A few folks pointed out that the manual for the heater recommends against putting it in horizontally. That's correct so do this at your own risk. It may void the warranty. I'd definitely advice to not submerse the heater fully unless the power outlet is a GFCI type so you can't shock yourself or the fish. As for my heater - it's still in the tank, it's still horizontally close to the gravel. Sadly the lever to adjust temperature settings ceased to work so the heater is set to 76F now, period. Might be a result of being permanently fully submersed or not.
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Reviewed in the United States on November 22, 2010 by Grusonii
Reliable temperature but unreliable display (edit - died!)
Size: E200
After having an old manual contact type fail silently and losing a few fish I went in search of a new and more reliable unit. Essentially all the reviews and guides suggested the lower tier ones were dicey and also that current quality was lacking even in "good brands". I tended to stick with the Marine (eg salt water) guides as there's usually a significantly higher investment in dollars and time and effort. And the environment is harsher. So if a Marine site liked or disliked a heater I heavily weighted that (as opposed to Pet Smart reviews which have a Pet Smart range normalization to reviews). These suggested going minimum middle tier - which also generally means fully electronic, submersible, displays, etc. For me it was mostly this Hagen / Fluval vs the Eheim. I went with this as the black plastic frame worked with my wifes desire to not see anything but fish. or rocks. or .... nothing modern ... I like the display and the adjustability is fine. And the fully submersible is great (as in no worries) What is annoying is when the display goes out of green range it "get stuck in blue". I think the "display portion" gets stuck - or more accurately - doesn't get updated as the rest of the electronics manage the temperature correctly. For example, when "stuck on blue" if I unplug it and plug it in (eg: reboot) it comes up and correctly displays the temperature - and it's always within the green range. Good job heater. Bad naughty display! I have also confirmed this with one of the plug-through Save-A-Watt power meters. eg that it displays ~200 watts consumption when it should be heating, and ~0 watts when it should not - no matter what the heater's display reads when it's stuck. So the temperature is maintained correctly - but the display doesn't always report correctly. So I don't think it's a sensor issue per-se - but a display update issue (eg firmware bug). Unplug and plug in and it will show correct temperature and you can confirm it with a 2nd thermometer. Still very annoying as I don't quite trust it as much - and I have to ignore it's temperature reading and still use a second thermometer to check temps. I would have given it 5 stars - but with the heavy investment in fish - not having confidence in your equipment is a serious issue. Two stars off for a display you can't trust and requiring 2nd thermometer to somewhat mitigate that. Where's the Hagen / Fluval I used to know and love? Hagen / Fluval has certainly short-sheeted the low and middle tiers. Update 12/12/12 ;) Well, the heater portion itself totally failed and I'm returning this. It took a while to convince my wife of this, which is one down side of the electronic display as opposed to the neon light in non electronic models. I highly recommend a power meter such as one of these. P3 International P4400 Kill A Watt Electricity Usage Monitor Move it about to what you want to check - and consider leaving one in critical places like heat.
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Reviewed in the United States on November 22, 2012 by MH.
amazing heater!
Size: E200
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!
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Reviewed in the United States on April 9, 2026 by Josie
Best heater I've had in 30 years
Size: E200
I have a 30 year old 44 gallon fresh tropical water pentagon shaped aquarium. I use both an under gravel filter driven with a power head and a canister filter. A month ago my heater failed so I quickly did a search all over Amazon to find a reliable replacement. The reviews on this unit are all over the place! So I took a chance and ordered it. With both filters running and the location of the heater I have plenty of current so no low flow issues. Set up was incredibly easy and exceptionally accurate. I heat my tank at 76 degrees and by the time this heater arrived at my door the tank was down to 68 degrees. Over all the years of maintaining an aquarium I wasn't about to raise the temperature back up to 76 in five hours. I gradually raised the temperature by two degrees each day for four days so the fish would slowly acclimate. This heater had no problems with this approach. Once it reached 76 degrees it maintained it within half a degree despite the house air temperature being 68 during the day and 64 degrees at night. Here's the unique thing about the design of this heater, the temperature near the bottom of the tank is almost identical to the temperature near the surface. I have never had a heater that was capable of this. I don't know if Fluval used black magic to accomplish this or if it's just unique to my tank design, filtration, and heater placement. I have only had this unit for four weeks but am very please with it. I will update this review should any problems arise.
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Reviewed in the United States on December 2, 2018 by Linda