| | |  | Heaters | Home » » » » Fluval M 300-Watt Submersible Heater | | | | | | | Description: | | The Fluval M Submersible Aquarium Heater’s quality manufacturing utilizes superior components and construction. The Fluval M 300 Watts Electronic Heater is ideal for use in aquariums up to 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. | | | Features: | |
• 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 80 gallons; 300 watts; 3 year warranty
| | | Product Details: | | | Product Length:
| 1.25 inches | | Product Width:
| 1.25 inches | | Product Height:
| 15.0 inches | | Product Weight:
| 0.72 pounds | | Package Length:
| 19.0 inches | | Package Width:
| 5.0 inches | | Package Height:
| 2.1 inches | | Package Weight:
| 0.8 pounds | | Average Customer Rating:
|  based on 70 reviews |
| | | | Customer Reviews: | |
Average Customer Review:
 ( 70 customer reviews )
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Most Helpful Customer Reviews
31 of 31 found the following review helpful:
 Great heaterJun 25, 2011
By Loren Sandford
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!
15 of 15 found the following review helpful:
Excellent heaterSep 10, 2010
By Louis Winkelstein
"louis"
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.
14 of 15 found the following review helpful:
 Good heater; bad camouflageAug 14, 2011
By Suzanne A. Herman
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.
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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.
8 of 9 found the following review helpful:
submersible, up to a point.Apr 04, 2011
By Coderpitt
"Pitt"
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.
5 of 5 found the following review helpful:
Nice heaterJul 26, 2011
By Jerry Helsing
"jlhelsing"
I needed to purchase a heater for my aquarium but didn't want to break the bank. When I went to the pet store, to get one, they wanted 3x what Amazon wanted for the same model. So, I ordered from Amazon with expedited shipping and had it the next day. So far, I am very happy with the heater and recommend it to anyone looking for an economical way to heat a tank.
See all 70 customer reviews on Amazon.com
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