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Fluval M 100 Watt Submersible Heater

4.6 4.6 out of 5 stars 4,840 ratings

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M100

Purchase options and add-ons

  • Submersible heater provides exceptional performance and unsurpassed reliability
  • The heater also includes an exclusive mirror technology that reflects the colours of the aquarium and enhances overall aesthetics
  • Sleek and compact
  • Quality heater made in Europe using superior components and construction
  • For fresh and saltwater tanks

Customer ratings by feature

Suction power
4.3 4.3
Temperature Control
4.0 4.0
Accuracy
3.8 3.8

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From the manufacturer

Fluval M Submersible Heater

Fluval M100 Premium Aquarium Heater is quality manufactured in Europe using superior components and construction. Sleek and compact, the submersible heater provides exceptional performance and unsurpassed reliability.

The heater also includes an exclusive mirror technology that reflects the colours of the aquarium and enhances overall aesthetics.

Key Features :

  • Quality heater made in Europe using superior components and construction
  • Sleek and compact
  • Ideal for 100 L (30 US gal) aquariums
  • For fresh and saltwater tanks

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 1.8 x 4.8 x 14.8 inches; 9.86 ounces
  • Item model number ‏ : ‎ A782
  • Date First Available ‏ : ‎ August 19, 2004
  • Manufacturer ‏ : ‎ Rolf C. Hagen (USA) Corp.
  • ASIN ‏ : ‎ B0027VONIU
  • Country of Origin ‏ : ‎ Italy
  • Customer Reviews:
    4.6 4.6 out of 5 stars 4,840 ratings

Looking for specific info?

Product Description

Fluval M100 Premium Aquarium Heater is quality manufactured in Europe using superior components and construction. Sleek and compact, the submersible heater provides exceptional performance and unsurpassed reliability.

Important information

Directions

Follow Instructions On Packaging

Customer reviews

4.6 out of 5 stars
4.6 out of 5
4,840 global ratings

Customers say

Customers like the quality, appearance and value of the pet toy. For example, they mention it functions well, it's reliable and accurate. Some appreciate the minimalistic design and the reflective tube. That said, most are happy with ease of installation. That being said, opinions are mixed on accuracy, submersible, and fit.

AI-generated from the text of customer reviews

340 customers mention254 positive86 negative

Customers like the quality of the pet toy. They say it functions well, is reliable, and lasts longer than some other heaters. Some mention that it works perfectly with their Fluval flex aquarium.

"...Very sturdy and made very well. I would definitely buy again!" Read more

"I have several M series heaters. They have all been accurate and reliable...." Read more

"...: These are nicely designed, sturdy heaters with strong borosilicate glass, quality interior components, and sleek contemporary..." Read more

"...any of my fish when it busted, it just ended up cracking, and the bottom fell off...." Read more

310 customers mention222 positive88 negative

Customers like the temperature adjustment of the pet toy. They mention it's amazing at holding constant temperature, keeps water warm, and has accurate temperature control. Some say the heater actually heated the water to what they set it at, and that it heats the water quickly. They also appreciate the simple design and the easy-to-adjust temperature dial on the top.

"I have this heater in my 30 gallon aquarium and it does a great job and keeping temp...." Read more

"Keeps the tank at a steady temp and doesn’t fluctuate much" Read more

"...The only problem I ran into, eventually I could not read the temperature gauge for the dial anymore because it came off or become covered in algae...." Read more

"...The thermostat is of high quality, with less temperature variation than most, but the poor calibration made that irrelevant...." Read more

89 customers mention81 positive8 negative

Customers like the appearance of the pet toy. For example, they mention it has a minimalistic design, is sturdy, and has borosilicate glass. Some appreciate the sleek, camouflaged glass look that doesn't take away from the aquarium. That said, some complain about the temperature setting dial.

"...They have all been accurate and reliable. Big and shiny and not for aquascapers, but great for people who just keep fish." Read more

"...: These are nicely designed, sturdy heaters with strong borosilicate glass, quality interior components, and sleek contemporary..." Read more

"Looks nice and is fairly unobtrusive in my tank...." Read more

"...I like the simple design and it is easy to adjust the temp, just turn the dial on the top...." Read more

54 customers mention44 positive10 negative

Customers like the value of the pet toy. They say it's cheap and reliable, and an economical way to heat a tank.

"...It’s also not very expensive for the sheer quality you will receive. The mounting is especially solid and sleek as well...." Read more

"...Otherwise a great heater at a good price." Read more

"...I recommend this one. Cheap and reliable. I have one for each of my tanks. No more problems or worries. [..." Read more

"Reasonably priced and Fluval quality has never let me down before. 6 ft cord is a plus and it seems to be accurate within 2 degrees" Read more

38 customers mention29 positive9 negative

Customers find the installation of the pet toy to be easy. They say it's extremely easy to set the temperature, plug and play with no issues, and use with the temperature control on the top. Customers also mention that the temperature is easy to read and the control is conveniently located at the top of the heater.

"...But like all heaters they do go out after some time. I like how easy it is to set but wish it had a digital display showing the temp instead but that..." Read more

"...Tube shows where minimal water line is near the top. Super easy decision, seriously, spend more time enjoying the hobby. Hope this is helpful." Read more

"...The temperature control is conveniently located at the top of the heater and is very accurate...." Read more

"...for a 55g. At highest setting, keeps water temp at 78F. So, a little underwhelming, but works fine, keeps temps right at set temps." Read more

48 customers mention17 positive31 negative

Customers are mixed about the submersible. Some mention that it's an absolute plus, while others say that it is not fully submersable.

"...I never realized that the heater was not fully submersible, just to the two water lines...my original heater I kept just about dully submerged in my..." Read more

"...But it is fully submergible. I know it says didfferently...." Read more

"...Finally, I wanted to dispel the myth that this heater is not fully submersible...." Read more

"...There is a misconception on the internet that the heater isn't fully submersible. The line is there due to regulations in certain countries...." Read more

46 customers mention25 positive21 negative

Customers are mixed about the accuracy of the pet toy. Some mention that the accuracy is perfect, perfectly calibrated, and consistent. However, others say that the dial is not accurate, making it difficult to estimate an exact setting.

"I have several M series heaters. They have all been accurate and reliable...." Read more

"...high quality, with less temperature variation than most, but the poor calibration made that irrelevant...." Read more

"This unit is perfectly calibrated right out of the box, keeps a steady temperature without constantly cycling on and off...." Read more

"...tank set at 79 and thermometer reads 82, I set it to 75 it reads at 80 very inaccurate and the size of it is pretty long the aquatop is more small..." Read more

43 customers mention15 positive28 negative

Customers are mixed about the fit of the pet toy. Some mention that it fits perfect in their 30 gallon tank, while others say that it's too long and tall for the 5 Gallon Fluval Nano tank.

"...Tried sliding the holder further down but the holdef fits too loosely and the heater is top heavy, so I added another suction cup at the bottom of..." Read more

"Added to our Fluval Flex AIO tanks, fits perfect in the rear compartment so it stays hidden...." Read more

"...a 5 gallon tank and it is longer than my tank is tall so it has to lay diagonal to fit. Hopefully it works just as well...." Read more

"...They have been the best and longest lasting I've tried. This 50 is a bit long for it's intended use 5-10 gallons. But it is fully submergible...." Read more

Heater works perfectly
5 Stars
Heater works perfectly
Highly recommended, Prompt Shipment and Precise Item received.
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Top reviews from the United States

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Liz
5.0 out of 5 stars Great, long lasting heater.
Reviewed in the United States on November 3, 2017
I used Amazon to purchase my second Fluval 100w submersible heater, because it was a better price Tha PetSmart.
My first one, I purchased at a local pet store about 6 years ago, and didn't fail me once. My original heater was used everyday, not once was it turned off, except with water changes and other maintenence. It kept my tropical fish warm and happy year round at 72°.
I never realized that the heater was not fully submersible, just to the two water lines...my original heater I kept just about dully submerged in my tank, but never had any issues in doing this. The only problem I ran into, eventually I could not read the temperature gauge for the dial anymore because it came off or become covered in algae. My new one I will be sure not to fully submerge it, but it will still be over the water line, otherwise it wouldn't fit under the hood.
I could have replaced the heater sooner, and wish I had...the week before my old one broke, I had put it down on the list of things to get. Pretty lucky that the heater didn't hurt any of my fish when it busted, it just ended up cracking, and the bottom fell off. This doesn't falter decision on my rating though, the heater lasted longer in my tank than any other I have used in the past, and I have kept aquariums for about 15 years now.
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Top reviews from other countries

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RaC
5.0 out of 5 stars Ha salido muy bueno.
Reviewed in Mexico on May 1, 2023
One person found this helpful
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Locked Out
5.0 out of 5 stars Bad shipping...
Reviewed in Canada on May 27, 2022
One person found this helpful
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Dario
5.0 out of 5 stars Bom aquecedor aquário
Reviewed in Spain on May 13, 2023
UnGatekeeper
3.0 out of 5 stars Not transparent, too long
Reviewed in Sweden on January 30, 2023
Yssak
5.0 out of 5 stars Magnifique et solide
Reviewed in France on October 13, 2022