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Aqueon Aquarium Fish Tank Preset Heater For Up To 40 Gallons, 100 Watts

4.3 4.3 out of 5 stars 4,040 ratings
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Amazon's Choice in Aquarium Heaters by Aqueon
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100 Watts
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Purchase options and add-ons

Brand Aqueon
Special Feature Preset Aquarium Heater
Color Multicolored
Form Factor Heater
Indoor/Outdoor Usage Indoor
Power Source
Corded Electric
Heating Method
Forced Air
Item Weight
0.5 Pounds
Heat Output
100 Watts

About this item

  • Preset to 78 degree, accurate to plus/- 1 degree
  • No adjustment required
  • Shatter resistant
  • Fully submersible, auto shut-off when overheats, resets when cools down
  • LED light turns on when aquarium water is being heated
  • Ideal for aquariums up to 30 gallons

Customer ratings by feature

Easy to use
3.7 3.7
Suction power
3.5 3.5
Value for money
3.2 3.2
Accuracy
3.2 3.2
See all reviews

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From the manufacturer

It's All About The Fish!

Developed by true aquatic hobbyists, Aqueon provides a broad array of aquarium solutions to help maintain healthy, life-sustaining aquatic environments. From inception, Aqueon had one goal in mind: “Doing what is best for the health and well-being of fish and aquatic life.” This focus on the little things will make your life easier when keeping an aquarium, and in turn, keep your wet friends happy and healthy. Because with the Aqueon brand, it’s all about the fish.

Aqueon

Aqueon
For Seasoned Hobbyists:

we are committed to aquarium product innovation so that we continue to offer products that get you excited.

For Beginners:

We make it easy for you to get your first aquarium and to grow in the hobby as you become more of a fish expert with every step you take and every new thing you learn. Products include:

  • Aquariums and Fish Tanks
  • Filters
  • Lighting
  • Species specific food
  • Fish and water care

Product information

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Aqueon

Aqueon Aquarium Fish Tank Preset Heater For Up To 40 Gallons, 100 Watts

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Product guides and documents

Instructions for Use (IFU) (PDF)
User Guide (PDF)

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 3.5 x 1.5 x 7 inches; 8 ounces
  • Item model number ‏ : ‎ 100106252
  • Department ‏ : ‎ Unisex-Adult
  • Date First Available ‏ : ‎ November 5, 2014
  • Manufacturer ‏ : ‎ Central Garden & Pet
  • ASIN ‏ : ‎ B00P9QH5US
  • Country of Origin ‏ : ‎ China
  • Customer Reviews:
    4.3 4.3 out of 5 stars 4,040 ratings

Looking for specific info?

Product Description

Aqueon Preset Aquarium Heaters require no adjusting! The preset temperature has been calibrated to 78°, appropriate for most tropical fish. It is fully submersible, constructed of shatter-resistant quartz glass and features an automatic safety shut-off to avoid overheating. The heaters include suction cups and can be placed vertically or horizontally within the aquarium.  An LED indicator light displays red when actively heating. Available in different sizes to accommodate all aquarium sizes.

Aqueon products offers a wide range of items so that you can build and maintain a healthy aquatic environment. All the essentials from fish tanks, filters, lighting, food, care, and other supplies that your pet fish needs. We make it easy for you to get your first aquarium and to grow in the hobby as you become more of a fish expert with every step you take and every new thing you learn. For those seasoned hobbyists, we are committed to aquarium product innovation so that we continue to offer products that get you excited. With the Aqueon brand, it's all about the fish.

Disclaimer: Variations in room temperature may cause slight deviations in the actual water temperature.

Top Brand: Aqueon

Highly Rated
100K+ customers rate items from this brand highly
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Important information

Directions

Preset to 78°, accurate to +/- 1°

Customer reviews

4.3 out of 5 stars
4.3 out of 5
4,040 global ratings

Customers say

Customers like how easy it is to install the space heater. They say it is simple and convenient. They also appreciate the size and value of the product. However, some customers have reported issues with stability, saying it fails to stay on. They dislike the suction and disagree on durability, temperature, and performance.

AI-generated from the text of customer reviews

69 customers mention49 positive20 negative

Customers like the value of the space heater. They say it's a great way to save money on heaters for QT tanks, rock curing tubs, and water mixing. They also say the quality and price are hard to beat. Some customers even keep a few spares as backups.

"...Nice look/design and affordable." Read more

"...We’ve had the same model for a a smaller tank for years. A very good value." Read more

"...DO not buy this CHEAP Amazon product. Disgusted, will never buy an Aqueon product again, and unlikely to buy such a product through Amazon...." Read more

"The price is right, but they don't last forever. Luckily I frequently check the temp in the tank and noticed it was down to around 72 degrees...." Read more

30 customers mention24 positive6 negative

Customers like the size of the space heater. They say it's wonderful, perfect for small tanks, and compact. Some say it can hide anywhere. Overall, most are satisfied with the size and recommend it to others.

"Great for my 10 gallon tank. I was worried that it would get the water to hot but it auto and doesn’t heat higher then 78. My tetra love it" Read more

"...I could not turn this up due to manufacturing setting! It is a nice size and keep the temp at the correct temperature!" Read more

"To start, this is nice and compact with it being a bit over 5.5 inches...." Read more

"...Its the perfect size for my 10 gal tank, its not big and doesnt look bulky, and it does its job just fine." Read more

23 customers mention23 positive0 negative

Customers find the installation process of the aquarium heater to be easy. They mention that it's simple, convenient, and takes just a minute. Some say that it works straight out of the box.

"...Easy to use already programed, just plug in and submurge" Read more

"...It is silent, easy to install, light, and is barely noticeable in the tank. It works great I recommend" Read more

"It’s really easy to use, all I had to was plug it in...." Read more

"...I like the convenience and ease of use. I am writing this in the summer, and so we’ll see how it does in the winter...." Read more

273 customers mention134 positive139 negative

Customers are mixed about the performance of the space heater. Some mention that it does its job just fine, while others say that it stopped working after a few months, started malfunctioning, and the instructions are useless.

"Tank heater works as it should. The red light turns on when it's heating. I got 2 of the 100 watts in tank water heater...." Read more

"...The first one worked great, but after a few months, it stopped working...." Read more

"...Never lower and might go to 77.9. Not adjustable but works great for me and the fish appear to have little smiles." Read more

"...and disgusted that this broke, only for me to discover it’s non-working condition a week since the last time I checked the temperature...." Read more

250 customers mention128 positive122 negative

Customers are mixed about the temperature of the space heater. Some mention that it keeps the water warm and doesn't overheat. However, others say that it struggles to maintain the temperature, shutting off even though the water isn't that warm, and that the temperature calibration may be slightly off.

"...The heaters work for both tanks. Not overheating. They stay in a range...." Read more

"...a new one, and this one keeps shutting off even though the water isn't that warm...." Read more

"This heater keeps the water temperature a constant 77° and all you have to do is plug it in. It's pre-set. No fiddling with a dial...." Read more

"...Struggles in very cold weather but I'm sure they all would in sub zero temps" Read more

63 customers mention24 positive39 negative

Customers are mixed about the durability of the space heater. Some mention that it's going strong, dependable, and built very sturdy. However, others say that it broke and shattered into pieces.

"...I’m flabbergasted and disgusted that this broke, only for me to discover it’s non-working condition a week since the last time I checked the..." Read more

"...But during the year it's very reliable and steady. I would give it 5 stars if it would last longer." Read more

"...received an electrical shock at least once and these have the shortest life span. The second type the switch inevitably fails...." Read more

"The water heater started peeling about three months in. Now it leaves little peeled off black particles in my aquarium 🥴..." Read more

25 customers mention6 positive19 negative

Customers are dissatisfied with the suction of the space heater. They mention that the sucker cups are not holding suction as well as they once did, the cups started getting week, and the sutor cup does not suck to the glass and stay there. Some customers also report that the product comes with missing suction cups for mounting.

"Works great, suction not that good." Read more

"does not heat well, does not adhere to clean glass well….more junk" Read more

"...Suction cups are a little crap but that's all." Read more

"...The suction on the suction cups is great. They stay put. The cable is not crazy long, maybe 3 feet. Overall, it seems to be a good buy." Read more

23 customers mention4 positive19 negative

Customers are dissatisfied with the stability of the space heater. They mention that it fails to stay on to raise tank temperature, it continues to go off and come back on an hour later without heating their tank, and it continues turning off and on randomly. Some say that it only stayed on for a few seconds and never turned on again.

"...Maybe it's on purpose, because it shuts off around 80 degrees, but I swear the first one heated warmer. My ideal would be about 82 degrees." Read more

"This product doesn't really work as a heater in a 40 gallon. It consistently shuts off and the water to my turtle tank does get very cold as a result..." Read more

"...It is on constantly compared to the one I had previously, and it’s only in a 10 gal tank. It seems to struggle to maintain the temperature...." Read more

"...I unplugged and replugged - that made them both come on, but neither would not stay on. They are completely submerged...." Read more

Worksgreat
5 Stars
Worksgreat
Preset and keeps my tank at 79 works good so far so good
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Top reviews from the United States

Krystal
5.0 out of 5 stars Good
Reviewed in the United States on February 14, 2024
Size: 100 WattsVerified Purchase
This is a good heater, but have had a couple issues. This is my second one. The first one worked great, but after a few months, it stopped working. I ordered a new one, and this one keeps shutting off even though the water isn't that warm. Maybe it's on purpose, because it shuts off around 80 degrees, but I swear the first one heated warmer. My ideal would be about 82 degrees.
2 people found this helpful
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Chuys Garage
5.0 out of 5 stars Aquarium Fish Tank Heater
Reviewed in the United States on March 15, 2024
Size: 100 WattsVerified Purchase
Tank heater works as it should. The red light turns on when it's heating. I got 2 of the 100 watts in tank water heater. I have a 20-gal tank and a 40-gal tank. The heaters work for both tanks. Not overheating. They stay in a range. If you need a specific temperature, this is probably not for you but if you need the tank to stay within a 70 & 73 then this would be perfect. The suction on the suction cups is great. They stay put. The cable is not crazy long, maybe 3 feet. Overall, it seems to be a good buy.
One person found this helpful
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gary h
5.0 out of 5 stars 1 1/2 yrs after purchase..still 5 stars
Reviewed in the United States on April 21, 2024
Size: 200 WattsVerified Purchase
My 200 w heater maintains a constant 77.3 degrees in my 36 gal tank. Never lower and might go to 77.9. Not adjustable but works great for me and the fish appear to have little smiles.
Helpful
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michael h
4.0 out of 5 stars Works great for one year
Reviewed in the United States on November 2, 2023
Size: 200 WattsVerified Purchase
This heater keeps the water temperature a constant 77° and all you have to do is plug it in. It's pre-set. No fiddling with a dial.
I'm on my third one now because they quit after about 1 year. But during the year it's very reliable and steady. I would give it 5 stars if it would last longer.
4 people found this helpful
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Lisa A. Minnott
5.0 out of 5 stars Great for my 55 gal turtle tank
Reviewed in the United States on April 16, 2024
Size: 200 WattsVerified Purchase
Great heater for my 55 gal tank!
One person found this helpful
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Art B
1.0 out of 5 stars Broke in 6 months and received excellent care. DO NOT BUY!!
Reviewed in the United States on April 15, 2024
Size: 100 WattsVerified Purchase
This heater stopped working within six months of purchase and installation. I care for my fish very lovingly and responsibly and this filter was never treater in any way, other than the prescribed, instructed manner. I’m flabbergasted and disgusted that this broke, only for me to discover it’s non-working condition a week since the last time I checked the temperature. DO not buy this CHEAP Amazon product. Disgusted, will never buy an Aqueon product again, and unlikely to buy such a product through Amazon. Also, of note, I have never provided such terrible feedback to any of my longstanding Amazon purchases. If you love your fish, as I do, and have learned, spend more, go to an aquarium store!
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Sabina Mitchell
5.0 out of 5 stars Heats tank well
Reviewed in the United States on January 27, 2024
Size: 100 WattsVerified Purchase
My tank sits on an outer wall in my house It was getting very cold This product helped. Struggles in very cold weather but I'm sure they all would in sub zero temps
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Me
5.0 out of 5 stars Works Well
Reviewed in the United States on March 24, 2024
Size: 100 WattsVerified Purchase
I have 5 fish tanks and this works just fine in my smaller tanks. Nice look/design and affordable.
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Top reviews from other countries

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Cindy
5.0 out of 5 stars Amazing
Reviewed in Canada on January 4, 2022
Size: 100 WattsVerified Purchase
I was shocked about how good this item is.
When it first came, I thought it would overheat my tank, but I had to give it a try.
So when I placed the heater in, the suction was pretty secure! I was surprised by this, because lots of
heaters' suction power does not stick well.
It gets better and better! I turned on the heater and I saw the red light. I waited for a few more minutes and the light went down. At first, I thought I didn't plug the cable well, but after a while, I realized it was actually controlling the temperature in the tank. Amazing!
It turned on and off, on and off. Then I checked the temperature in the tank. It was perfect!
Overall, this heater is a solid 5 star!
3 people found this helpful
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Pablo Guerrero
5.0 out of 5 stars buen producto
Reviewed in Mexico on March 23, 2023
Size: 100 WattsVerified Purchase
me parebe bueno para el precio, cumple bien su funcion.
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Client d'Amazon
5.0 out of 5 stars good but dont like that
Reviewed in Canada on November 2, 2022
Size: 200 WattsVerified Purchase
it is a good product, but i don't like preset heater beause it is pre set XD it do his thing perfectly thaugh and it is compact but i didn't see it so... im stuck whit it.... is ok but don't like that and i didn't want to get all the trouble to send them backlolllll *because if you have diseases, algue or itch you will have to get temp. higher or lower in order to solve that and whit that you can't...
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simon robinson
5.0 out of 5 stars The best idea
Reviewed in Canada on September 21, 2022
Size: 200 WattsVerified Purchase
Awesome product..never figured out why you need an adjustable heater as once set to 78-80 degrees you never touch it again. and fully submersible so it can sit under your filter outflow and distribute the heat evenly
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calaltaca
4.0 out of 5 stars Something to think about
Reviewed in Canada on November 9, 2021
Size: 200 WattsVerified Purchase
As a follow up to my previous review. While the heater is fine and the preset leaves some worry out it being turned down/up by accident - BUT, I wasn't even thinking about this issue at the time as I'm sure a lot of people aren't, I had an Ich breakout in my tank a few days ago. Can't/don't want to use the numerous chemical treatments or the salt method as i have a few scale less fish. One a Zebra Pleco which is a fairly expensive fish . Plus I have a fully planted tank. So, the only other (and the most effective way) is to turn the heat up. Can't do that with this. Sooo today I had to go out and spend another 40.00 on an adjustable heater. Most aquarists will have a disease go through their tank at sometime and Ich is the easiest one to cure, IF you can turn the heat up.
3 people found this helpful
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