item: 5143182 By Fluval

Fluval® Submersible Heaters

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These submersible heaters can be used in fresh or saltwater tanks. They all feature a unique reflective technology that maintains the natural look of your aquarium. Available in a wide variety of sizes to fit most tanks.

The Fluval M series submersible glass heaters are quality manufactured in Europe using superior components and construction. These sleek, compact heaters can be trusted for exceptional performance and unsurpassed reliability. Unique only to the Fluval M series is the reflective technology which helps maintain your aquarium's natural look as the heater reflects the colors of the surroundings. For use in fresh and saltwater tanks. Manufacturer offers a 3 year warranty.


  • Easy to adjust temperature dial.
  • Exclusive slim profile tube.
  • Reflective technology maintains your aquarium's natural look as it reflects the colors of the surroundings.
  • Shock resistant borosilicate glass.
  • Cool blue on/off indicator lamp.
  • High density Ceramic Heat Sink extends heating efficiency.
  • Exclusive sealing system protects against water penetration.
  • High temperature silver nickel pointed thermostat for extended accuracy and service life.
  • Long life suction cups.
  • Safe for fresh and saltwater use.


Fluval® Submersible Heaters
0.00 New Available
Fluval® Submersible Heaters
0.00 New Available
Fluval® Submersible Heaters
0.00 New Out Of Stock
Fluval® Submersible Heaters
0.00 New Available
Fluval® Submersible Heaters
0.00 New Available
Fluval® Submersible Heaters is rated 3.6 out of 5 by 37.
Rated 5 out of 5 by from Great Heater! I bought this heater to replace and old one that stated to go crazy on me. I bought it a few months ago and have had no problems. easy to install and ready to use. Great Product!!
Date published: 2010-08-09
Rated 4 out of 5 by from Here's the recommended wattage for different tanks 5 Gallon/25 Liter 25 watt 10 Gallon/50 Liter 50 watt 20 Gallon/75 Liter 50 watt 25 Gallon/100 Liter 75 watt 40 Gallon/150 Liter 100 watt 50 Gallon/200 Liter 150 watt 65 Gallon/250 Liter 200 watt 75 Gallon/300 Liter 250 watt
Date published: 2018-01-13
Rated 5 out of 5 by from Finally! I bought literally every heater that Petsmart sells trying to find one that would actually keep the temperature. I have a 10 gallon which you wouldnt expect to be hard to heat! This is the one! I have to set it to 75 to get the water to 77 but that's ok. It NEVER goes below 77 and remains steady despite crazy Texas weather. 50's at night...80's during the day and it keeps perfect.
Date published: 2016-12-02
Rated 5 out of 5 by from Excellent heaters! I initially purchased a 200w heater for my 55 gallon tank and because it looks good in the tank and does such a good job heating, I purchased a 100w for my 20 gallon tank. I have been using the heaters for awhile now and I have no complaints. Although there is a min/max line printed on it, I submerged it until just the top temp adjuster is out of the water. The blue light is a lot better looking than most heaters that have a red light. Just remember with heaters, you get what you pay for. This particular heater goes on sale often and for the price, it can't be beat. If anything happened to either one of mine I would purchase another fluval heater. I'm very satisfied.
Date published: 2013-01-22
Rated 5 out of 5 by from No problems. I have both a 50w and a 150w, so far everything has been good. No issues with these heaters plus they aren't to bulky.
Date published: 2013-12-15
Rated 5 out of 5 by from warm and cozy..mmmmmm love this heater! it keeps the tank nice and warm and it was so easy to use!!!! i love it.. the fish love it... its just a great heater!
Date published: 2013-05-18
Rated 5 out of 5 by from simple, straightforward, effective I've had mine for a few weeks now and I find it's a very reliable product, the water was heated up in around 24 hours, and the temp is steady and constant, the only thing I find is wrong is that the heater slips downwards a little and the heater is more submersed than it's supposed to be, it's only happened twice, and it seems to have stopped, idk why it's doing that, but the water level is just at the limit line, which is fine, but it makes me uncomfortable as I want to conserve the heater and have it not burn out
Date published: 2013-04-30
Rated 1 out of 5 by from Seriously disappointed I had a Fluval heater for a 75-gallon tank I had a few years ago. It was awesome. It kept the tank at the perfect temperature. I recently set up a 35-gallon hex and knew I wanted another Fluval heater. The quality must have gone down since my last purchase because I'm having trouble with this one. It didn't come on until I turned the temperature way up and I only know because the bottom of the tube started getting warm. I don't seem to have the blue light to tell me it's when it's on. I'm seriously considering returning it for a different brand.
Date published: 2018-08-17
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What size heater would a need for a 10 gallon I currently have one but I do not think it works well I was wanting to get fluval but not sure if they made one for this or if I could use one like this and set the temperature.

Asked by: Nessdel126
Answered by: Eriatarka
Date published: 2018-08-27

What wattage do I need for a 30 gallon tank?

Asked by: Bette25
General rule of thumb is number of gallons x5
Answered by: Eriatarka
Date published: 2019-01-04

How long to wait before I put it in the tank and what temperature to put it on?

Asked by: Anonymous
It says to put it in the tank but let it adjust to the temp of your water for like 30 min before you plug it in. The required temperature depends on your fish, tropical fish in general want around 78 but fish like goldfish and I think plecos prefer a little cooler temp.. tbh just Google your fish
Answered by: Eriatarka
Date published: 2018-08-27

Which size is good for a 5 gallon tank and would it be good for a betta fish?

Asked by: tiffanya601
Go with the 50w but just keep it near your filter so it can disperse the heated water well. It automatically stops heating whenever it reaches the temp you set so it shouldn't overheat your tank.. I don't see how it wouldn't work with a betta unless yours likes to wedge itself behind things ?
Answered by: Eriatarka
Date published: 2018-08-27

Is this fully submersible??

Asked by: Redneckman
No it is not.
Answered by: fishlover782
Date published: 2018-03-29

Does this brand make one that will work in a 3 gallon tank?

Asked by: Mandaa
No It doesnt, unfortunatelly. But Aqueon and tetra do I believe. Youll need 5-10 watts.
Answered by: Animalsbya on YouTube
Date published: 2018-01-13

How many watts for 150 gallon tank?

Asked by: Jackazee
A 300w but, It really depends on what temperature you want your tank. I'd start with 300w and with the adjustable temperature gauge you should be fine and raise the temp when needed. :)
Answered by: Animalsbya on YouTube
Date published: 2018-01-13

Is this heater completely submersible? It has a water line on is so I'm afraid to put the whole thing under water.

Asked by: Lstorrie
It is not completely submersible. There are 2 water lines for minimum and maximum levels. I love my heater, but I do constantly check to make sure it hasn't fallen in.
Answered by: nightman
Date published: 2018-08-12
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