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RC Hagen A781 Fluval M 50 Watt Submersible Heater

5.0 out of 5 stars 1 customer review

Price: CDN$ 39.34 FREE SHIPPING.
Only 2 left in stock.
Ships from and sold by PetsAndPonds.
4 new from CDN$ 39.32
  • 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

New Arrivals

Product Details

  • Product Dimensions: 3.2 x 3.2 x 27.9 cm ; 281 g
  • Shipping Weight: 272 g
  • Item model number: A781
  • ASIN: B0027VMPXA
  • Date first available at Nov. 1 2011
  • Average Customer Review: 5.0 out of 5 stars 1 customer review
  • Amazon Bestsellers Rank: #26,542 in Pet Supplies (See Top 100 in Pet Supplies)
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Product Description

The Fluval "M" 50 watt submersible heater is quality manufactured in Europe using superior components and construction. This sleek, compact Fluval heater can be trusted for exceptional performance and unsurpassed reliability. Unique only to the Fluval "M" series the reflective technology helps maintain the aquariums' natural look as the heater reflects the colors of the surroundings. The heater is ideal for 15 US gal (50L). aquariums and can be used in fresh and saltwater tanks.

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Top Customer Reviews

Verified Purchase
Very happy, keeps the temperature constant in my 12 gallon fluval edge.
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Most Helpful Customer Reviews on (beta) HASH(0xa5aa0aa4) out of 5 stars 276 reviews
77 of 79 people found the following review helpful
HASH(0xa556f504) out of 5 stars 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!
30 of 30 people found the following review helpful
HASH(0xa556f72c) out of 5 stars Excellent heater Sept. 10 2010
By Louis in Maryland - 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.
45 of 50 people found the following review helpful
HASH(0xa556f990) out of 5 stars 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.
11 of 11 people found the following review helpful
HASH(0xa556fcc0) out of 5 stars Does not warm the tank properly Sept. 23 2013
By P. Horbatt - Published on
Verified Purchase
I've got a 35 gallon salt water tank, with a 2 gallon or so sump filtration system, so a total of 35-40 gallons. My last water heater for the tank was a 150 watt, I positioned it in the corner behind some coral to keep it out of sight, and it heated the water to 80 degrees easily, for 5 years.

When that burnt out, I purchased this heater. After reading the reviews, and seeing a lot of people having problems with the temperatures this unit can bring the water to, I decided to go for the 200 watt (supposed to be enough for a 60 gal tank), just to be sure there was PLEANTY of power to heat the tank properly.

Unfortunately, I've not been having much luck. Even at max setting of 86 deg, the tank was only getting heated to 75 degrees in a 70 degree room. I decided to move the heater to the back center of the tank with no obstructions, that helped a little bit, the tank is now at 79 degrees.

This is simply not going to work. I'm in Indianapolis and in the Winter, the room with the tank will get down to 60 degrees and I know that heater is not going to be able to warm the tank to 80 degrees.

What a drag, with Fall quickly trying to show it's chilly side, I now have to scramble to send this one back, wait for a refund and buy another one. I'd recommend you skip this product and select another one.

November 20 Update:
So, I replaced the heater I had received with another identical one, thinking that perhaps I just got a broken one, but unfortunately, this heater is even less effective than the last one. The max temperature the replacement heater is about 77 degrees even though I have it set to maximum of 86 degrees. Really, just stay away from this heater. Find another one.
14 of 17 people found the following review helpful
HASH(0xa556fef4) out of 5 stars 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.

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