FREESEA Aquarium Fish Tank Heater: 100W Small Submersible Turtle Heater with Adjustable Temperature External Controller for Betta | Saltwater | Freshwater | 10-20 Gallon
Condition: New
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At a glance
- Condition
- New
- Size
- 100W(10-20gallon)
- Model
- FS28-100W
- Dimensions
- 2.5 x 1.5 x 3.5 in; 8.08 oz
- Weight
- 8.1 oz
Features 6
- FREESEA Aquarium Heater: 100W betta fish heater, voltage: 110~120V, is suitable for use in 10-20 gal betta fish turtle tanks and aquariums. The power cord is 5ft, long enough for indoor use
- Double Safety Protection: When the top part of the turtle tank heater is out of water it will auto shut off. When the actual water temperature is higher than 94F, it will auto activate the overheating protection and stop heating
- External Controller: The betta fish heater is adjusted by an external controller, which you can mount on the outside edge of the tank. Its convenient to adjust temperature that range from 63F to 94F
- LED Temperature Display: Digital led temperature display shows the real-time temperature and error code on the screen. When the mini aquarium heater is heating, there indicator light above the digit is on red
- Excellent Service: The Heater of the FREESEA operate very stably under Fish Tank. If you have any questions about the Heater you received, please feel free to contact us at any time. 24-Hour Professional After-Sales Service
- Electrical Safety: To prevent electric shock, the heater must be plugged into a GFCI leakage protection outlet to ensure aquarium safety.
Description
FREESEA is always dedicated to innovate and optimize our products and has a professional after-sales team. We are committed to bring high-quality and stable aquarium supplies and the best after-sales service for each aquarium enthusiast. FREESEA is the most professional aquarium shop you can trust. The FREESEA team was started in 2005. We have been in the field of aquarium for more than ten years with the most professional team and first-class after-sales service. We have our own R&D team and factory. Each product is independently developed and designed by our team, and has applied for a patent, which is unique in the market. FREESEA products are rigorously tested and used for a long time before being available in bulk. We focus on providing quality products and services. 75W 50W 50W 100W 200W 300W 25W
Specs 10
| Product Dimensions | 2.5 x 1.5 x 3.5 inches; 8.08 ounces |
|---|---|
| Item model number | FS28-100W |
| Manufacturer | FREESEA |
| Item Weight | 8.1 ounces |
| Item Package Dimensions L x W x H | 5.63 x 3.7 x 2.64 inches |
| Item Dimensions LxWxH | 2.5 x 1.5 x 3.5 inches |
| Brand Name | FREESEA |
| Target Audience Keyword | fish |
| Color | Submersible Heater with External Controller |
| Size | 100W(10-20gallon) |
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Frequently asked questions
This product is currently out of stock. Please check back later for shipping info.
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Fish boiled alive overnight: dead
Size: 100W(10-20gallon)
I woke up this morning to my betta dead and the tank temp at 105.2 degrees Fahrenheit and the heater registering HH. I’ve bought two of these and the first one was great. But now both my self and my kid are heart broken to have our fish dead after having the new tank set up for less than a month to have my fish boiled alive. I’ll never buy this again. I’d rather go to the cheap not able to control undersize heaters. At least my fish won’t be dead.
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Reviewed in the United States on October 10, 2024 by Lady Andramada
Lasted Almost Two Years, Then Failed
Size: 100W(10-20gallon)
Purchased this tank heater in January of 2023. It has worked well since purchased, but has now failed on December 25, 2024 at almost the two year mark. What was concerning was not that it failed, but how it failed. The unit short circuited in the tank and burned up under water leaving the tank filthy with whatever plastic burned up. Also, whenever gas escaped in bubbles when it was burning up left a burned smell throughout one part of my house. Fortunely, I happend to be home and not far from the tank when this happened, so I was able to trace down the sound and smell and unplugged the unit. Hopefully, the fish in my tank will survive whatever chemicals were released into the water when the unit burned up. Maybe I just got a dud, but I would be cautious using this heater in any place that is unattended for any long periods of time.
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Reviewed in the United States on December 26, 2024 by J. Gomez
Good news... It works great
Size: 100W(10-20gallon)
highly recommend Freesea 100W fish tank heater. paired it with a SunSun JP-022 submersible pump to increase circulation, increase surface water agitation (increase oxygen transfer) and evenly heat the water. Also added a separate inexpensive thermometer to cross-check water temps. Completely satisfied. The ability to regulate the water temp at a push of the button is the best feature of the heater. Saved all my fish from ICK by giving me the ability to temporarily bump up the temp to 86 degrees and shutting off the lights for 7 days. I found I have to set the heater about 2 or 3 degrees higher than the desired temp I am trying to achieve in my tank.
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Reviewed in the United States on December 3, 2018 by Ritchie Rich
Beta approved!
Size: 100W(10-20gallon)
I love the ability to be able to see what the temp is! Super easy to use. Little light shows up when it’s heating. Easy setup up. Doesn’t get to hot either. My beta loves to prop himself up on it!
Reviewed in the United States on March 21, 2025 by Amber Ireland
Not durable, and not reliable
Size: 100W(10-20gallon)
Didnt last very long. My tank is at 65 when it should be at 78, Im glad I didnt wake up to my fish being dead. Never ran it dry, never let it over heat, just stopped working. UPDATE:I have now gone through 2 of these things, both with the same problem, they're just garbage. Dont buy one.
Reviewed in the United States on December 24, 2020 by Evan Stengel
The only heater I use
Size: 100W(10-20gallon)
I use these for all of my tanks and they work really well. They’re consistent with the thermometers in my tanks. My oldest one I’ve had since the end of August and it is still running fine. They’re a little large, but not a terrible size, even in my 10 gallon tanks. Someone else said it, but it is important to note that if the power goes out or these are unplugged, they will go back to the default temp which is rather high.
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Reviewed in the United States on October 18, 2020 by Amazon Customer
Only worked for 8 months!!
Size: 100W(10-20gallon)
I really liked this heater until it stopped working after 8 months!!
Reviewed in the United States on February 16, 2026 by LAURIE A GENTILE
It Caught Fire! Could have lost our home has we not been here when it happened!!!
Size: 100W(10-20gallon)
Had my wife not been in the living room when this happened, we could have lost our entire house to a fire from this heater! She heard a pop, then started smelling burning rubber and yelled to me to come into the living room and look at the fish tank. Came around the corner and instantly smelled what she yelled about, glanced at our 55gal tank and there was smoke coming off the water and the heater was glowing red, under water! Instantly grabbed the power cord and yanked it all the while this thing kept burning under water. Pulled it out and tossed it in the backyard as it was still hot to the touch. The fish were freaked out to say the least, but think they're okay, just hoping it didn't release any toxins while it burned. I'm going to do a water change to be safe. If we hadn't been here or if this happened at night, we could have lost the entire house! I'm going to write the manufacturer directly as this needs to be reported. We were so lucky! DO NOT BUY THIS HEATER! If you're using it, I'd unplug and get another brand ASAP, Don't think I could sleep at night knowing this thing was running in my house,
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Reviewed in the United States on May 11, 2023 by Kevin A