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RC Hagen A781 Fluval M 50 Watt Submersible Heater

by Fluval

Price: CDN$ 39.99
In Stock.
Ships from and sold by The Pet Quarters.
4 new from CDN$ 30.46
  • Built in reflective technology mirrors the surrounding colors, making the heater blend into your aquarium environment
  • Shock resistant Borosilicate glass; High density ceramic heat sick
  • Slim profile tube for easy placement; Easy to install
  • Exceptional performance and unsurpassed reliability
  • Suitable for aquariums up to 15 gallons; 50 watts; 3 year warranty

Product Details

  • Product Dimensions: 3.2 x 3.2 x 27.9 cm ; 272 g
  • Shipping Weight: 272 g
  • Item model number: A781
  • ASIN: B0027VMPXA
  • Date first available at Nov. 1 2011
  • Amazon Bestsellers Rank: #23,586 in Pet Supplies (See Top 100 in Pet Supplies)
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Product Description

The Fluval M Submersible Aquarium Heater s quality manufacturing utilizes superior components and construction. The Fluval M Series is ideal for use in aquariums from 15-80 gallons and has a temperature range of 66-86 degrees Fahrenheit. This sleek compact heater can be trusted for exceptional performance and unsurpassed reliability. Unique only to the Fluval M series the reflective technology equipped in the Fluval M Submersible Aquarium Heater helps maintain the aquariums natural look as the heater reflects the colors of the surroundings. The Fluval M Submersible Aquarium Heater Features and Benefits:. - Suitable for aquariums up to 15 gallons. - Exceptional performance and unsurpassed reliability. - Slim profile tube for easy placement. - Easy to install. - Built in reflective technology mirrors the surrounding colors making the heater blend into your aquarium environment. - Easy to adjust temperature control. - Shock resistant Borosilicate glass. - High density ceramic heat sick. - Backed by a three year warranty. 1.25 length x 1.25 width x 11 height

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Most Helpful Customer Reviews on (beta) 193 reviews
61 of 62 people found the following review helpful
Great heater June 25 2011
By Loren Sandford - Published on
Verified Purchase
Don't be misled by the information on the packaging that says this heater should not be submersed completely. I called Fluval and was told that they were forced to put that in the instructions and on the unit for the sake of Canadian requirements. The unit is fully submersible and it keeps my aquarium at a more even temperature than any other heater I've purchased. In addition the temperature dial seems to be much more accurate. Good unit! Buy it!
25 of 25 people found the following review helpful
Excellent heater Sept. 10 2010
By Louis Winkelstein - Published on
Verified Purchase
This is a very nice heater. The reflective surface makes it blend in. It IS submersible and is about 12" long. Like all heaters, you have to tweak it to find out the precise setting .......... no problem. I recommend it.
35 of 39 people found the following review helpful
Good heater; bad camouflage Aug. 13 2011
By Suzanne A. Herman - Published on
Verified Purchase
First, I selected 2 days shipping through Amazon Prime and received this item exactly on time, in the afternoon of the second day. It was packaged in a box with bags of air. I appreciated that since this is a fragile product.

The first thing I noticed upon opening the box was that this heater is huge for the wattage. Mine is 50 watts, to be used in a 10 gallon aquarium, and it is almost exactly the same height as the aquarium itself. Then when I put it in the aquarium it became clear that the reflective surface of the heater serves only to make it MORE visible. It just looks like this gleaming shiny metal object in there, and doesn't really seem to actually reflect the colors surrounding it, but instead it reflects the aquarium light above. Because of this I decided to lay it against the bottom back of the aquarium so that it is obscured by plants, and the cord goes right up the seam of the aquarium where it isn't noticeable. If you're buying this for its subtlety, you'll be disappointed.

BUT, despite this, I am pleased with my purchase to far. It has been keeping my 10 gallon betta tank appropriately warm, within a degree of the setting and that's all I really care about. I was going to get a Hydor Theo but this was bit cheaper. It seems to perform just as well. Granted I have only had it for about a day and a half, but I will update my review if the performance changes.

In case anyone's wondering, the heater appears to be some sort of metal or metallic material encased in glass, so it is fragile like other glass heaters. It's not made of metal on the outside.

Finally, I wanted to dispel the myth that this heater is not fully submersible. Although there is a fill line on the heater, my research has shown that everyone who has called the company directly has been told that the heater can be fully submerged safely, and that the fill line was included only due to some sort of strange government regulation.


Thought I would edit and say this is still heating well for me. I've also moved it into a different tank, and was able to position it in such a way that it is not very visible. I'm uploading a picture for reference.
12 of 15 people found the following review helpful
submersible, up to a point. April 4 2011
By Coderpitt - Published on
Verified Purchase
I purchased two of these for my 110 gallon tank. They keep the temperature right where I need it. My main issue is that there is a "do not place below this line" and it is about 1" below the "do not allow water below this line". My tank evaporates 2 inches in a week... so if I didn't fully submerge it, it would overheat due to lack of water. I've hard it submerged now for a couple of months with no problem; however, it is concerning that there is a max water level on a submergable heater. It works great and is working fully submerged, but I gave it a 4 because I suspect this might void the warranty.
6 of 7 people found the following review helpful
Bad product Nov. 12 2011
By RJG - Published on
Verified Purchase
I have many Fluval filters and have nothing but great things to say about them. So when I had a need for a couple of new heaters I didn't hesitate to order two Fluval M 200, one Fluval M 300 along with one Fluval E 300. I was so confident they would perform well that I disposed of the packaging set the temperature dial at 86 degrees and moved them into my two Discus tanks. Big mistake as they are unable of keeping the tanks in the desired 83-86 degree range. In fact they struggled to keep the tanks at 79 degrees. When you consider the ambient temperature in the room is 75 degrees this is not the hardest of tasks. I've run them fully submersed and as directed by the packaging," do not place below this line" and they perform equally badly under both conditions. Is it a calibration issue as proposed in other reviews? I'm not qualified to say but I can offer that they are simply bad products with confusing packaging; (submersible, not submersible) that did not work in my application. The one star is an unfortunate product the Amazon rating system as I would happily give it a well-earned zero star rating. In farness the Fluval E 300 is a great product and works as advertised.

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