AquaMiracle Adjustable 20W Small Aquarium Heater Submersible Fish Tank Heater Betta Heater Turtle Heater Super Mini Aquarium Heater with Digital Display Thermostat, for 2-4 Gallon Tanks
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Availability:
20 left in stock
Arrives
Friday, Nov 7
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Size: 20W
Features
- SUPER MINI SIZE This small aquarium heater is thumb size - only 2.36 (6cm) in length. Great for nano tanks / betta tanks. The innovative super mini size perfectly solves the headache of the fish keepers on the traditional heaters! Takes up less space, easy to hide, but in full power! Temperature range is 64-93F, for 2-4 Gallon tanks.
- ACCURATE TEMPERATURE Thanks to the intelligent inverter technology, with the in-built chips this thermostat keeps the heater at a constant temperature at an accuracy of 1F, much more accurate than the traditional knob-controlled heaters. The thermostat shows 2 readings the current temperature and the set temperature very easy to operate.
- DRY RUN / OVERHEATING PROTECTION Full consideration of safety. With the multiple protections this fish tank heater will stop working when the water level is lower than the minimum water level or when the water temperature exceeds 97F. You are free from cooking fish!
- MEMORY FUNCTION The last setting is stored in the thermostat. In case of a power cut, when the power recovers the heater will follow the last setting.
- MULTIPLE USES This heater can be used for both fresh and marine water. It can be not only used as an aquarium heater, but can also work for turtles, pet fountains, and plant seedling.
Product Dimensions : 0.9 x 0.9 x 2.36 inches; 2.47 ounces
Item model number : SC06A020
Date First Available : August 12, 2022
Manufacturer : AquaMiracle
Best Sellers Rank: #9,074 in Pet Supplies (See Top 100 in Pet Supplies) #19 in Aquarium Heaters
#19 in Aquarium Heaters:
Customer Reviews: 4.2 4.2 out of 5 stars 1,186 ratings
Item Weight: 2.47 ounces
Manufacturer: AquaMiracle
Item model number: SC06A020
Date First Available: August 12, 2022
Item Package Dimensions L x W x H: 5.94 x 3.23 x 2.05 inches
Item Dimensions LxWxH: 0.9 x 0.9 x 2.36 inches
Item Weight: 70 Grams
Brand Name: AquaMiracle
Target Audience Keyword: Fish
Directions: Adults 18 years and older.
Warranty Description: 1 Year Warranty
Model Name: SC06A020
Color: Black
Size: 20W
Included Components: Aquarium heater
Specific Uses for Product: Small aquarium
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Nov 7
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
Size: 10W(USB)
So far good little heater Takes minimal space and true temperature
Reviewed in the United States on September 23, 2025 by Get Physical Tina Michele
Size: 10W(USB)
Exactly what I was looking for I put it in a 1 gallon betta tank keeps water nice and warm my fish is swimming and happy to see me when I get near his tank again.. may be small but works big !
Reviewed in the United States on September 7, 2025 by Shirley Harbison
Size: 10W
I bought several of these heaters for my fishbowl. Very easy to use, and they work well. My beta fish used to love to sit on top of the heater (she's in Fish Heaven now). But if I ever get another Beta Fish I will definitely purchase again!
Reviewed in the United States on August 20, 2025 by Mel
Size: 10W(USB)
I bought the mini USB heater for my fish bowl. It does not work. I purchased a 5.1v 2.1A usb adaptor for it per specs but it does not heat at all. Originally set it for 78° and noticed it was not affecting water temperature so I set it up to 90° and it still does not affect the water temperature.
Reviewed in the United States on September 16, 2025 by Van T.
Size: 10W
Better for smaller tanks. Works pretty good for my 4 gal.
Reviewed in the United States on October 8, 2025 by melissa vierkant melissa vierkant
Size: 20W
Sam, our unexpected Betta fish birthday gift for our 7-year-old, quickly became a beloved member of our family. To ensure his happiness and comfort in his new home, we had to learn the ropes of Betta care. It was surprising to discover that these little fish, often sold in deli containers at pet stores, require a considerable amount of care. During our research, we learned that Betta fish thrive in water temperatures between 78 to 82 degrees Fahrenheit, and achieving this meant we needed 5 watts of heating power per gallon. That's why we found the 20-watt heater to be a perfect match for our 4-gallon tank. This compact heater was an ideal solution for our uniquely shaped round tank, where our only option was a fully submersible heater. Many other models we came across were bulky and had no suitable attachment points. However, this heater's strong suction cup allowed us to discreetly position it near the rim of the tank, preserving the tank's aesthetics. Not only has it maintained a consistent water temperature of a perfect 80 degrees, but it's also safe to touch, as Sam often swims close to it without harm. One feature we appreciate is the easily visible digital display, which helps us monitor the temperature and ensure Sam's safety. However, my one concern is the auto-shutoff setting, which is set at a rather high 97 degrees. Knowing that Bettas cannot survive in water temperatures exceeding 86 degrees, I can't help but worry about the possibility of returning home to an overheated tank.
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Reviewed in the United States on October 21, 2023 by Louie King Louie King
Size: 20W
Works well for my little 2.5 gallon nano tank that I use for a beta and plant. And that it is digitally adjustable makes it even better. Also comes with a suction cup clip to attach inside your tank. Don't expect major temp changes but it will adjust up a few degrees in 5 gallon or smaller tanks. The heating glass is exposed so be sure your fish/snails/shrimp/critters can easily get away from it's glass if it kicks on when they are attached to it. Nice little heater that's easy to setup and use with big temp numbers you can see from across a room. For very small tanks only.
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Reviewed in the United States on November 15, 2024 by Don Gray
Size: 10W
I bought the 10W version for a 1.6 gal tank. I like its size. But there are a couple of issues. The temperature reading is not stable at all. The displayed temperature continually varies between 1/2 to 1 degree, switching the displayed temp by a tenth of a degree every 2 to 4 seconds. For example, over the course of 20 seconds it drops from 76.2 down to 74.5, then over the next 20 seconds climbs back up again. The actual tank temperature cannot be changing that much that fast. The heater was off for that range (I had it set for 72), but while it is on, the readings also vary about the same amount. Because of the variation, you cannot rely on a quick glance at the heater display to tell you the tank temp, o you are going to need a second tank thermometer. Since the heater turns on when the temp drops to .3 degrees below the set temp, you need to base your setting on the lowest temp, so you'll need to pay attention for a minute or two before you know what that is for a given tank temperature. With a separate tank thermometer, you can make this work by noting the difference between the heater's lowest read temp and the tank thermometer's reading and subtracting that amount from the desired tank temp for its setting. Also, the heater turns off when the sensed temp rises above .3 degrees below the set temp. For example, if the set temp is 72 deg, the heater turns on at 71.7 and off at 71.8. The instruction manual states that it is supposed to turn off when the temp rises above the set temp (which would be at 72.1 if it was set for 72.) Given the sensor variability from the actual tank temp, as the tank temp first drops below the set temp - .3 deg threshold, the heater turns on, but will then turn off right away as the sensed temp climbs above the threshold. The heater would not be turned on continuously until the tank temp actually drops 1 degree below the set temp (so that the reading variation would not be enough to turn it on again). I can't think of a reason why the temperature readings should vary this way, perhaps my unit is defective?
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Reviewed in the United States on August 17, 2023 by Sarah A Lynn