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
Monday, Aug 3
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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: #14,045 in Pet Supplies (See Top 100 in Pet Supplies) #27 in Aquarium Heaters
#27 in Aquarium Heaters:
Customer Reviews: 4.2 4.2 out of 5 stars (1,288)
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:
Monday, Aug 3
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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Similar Products
Top Amazon Reviews
Size: 10W(USB)
I have a small 2 gallon tank and the 10w heater works great. I love the small capsule shape, it hardly takes up any room. My tank is circular and the suction cup adheres to it just fine.
Reviewed in the United States on January 19, 2026 by J Vacanti J Vacanti
Size: 10W(USB)
I love these little guys! They work perfect for my small tanks and beta aquariums. Between my daughter and I, we have 8 aquariums. Lol. Anyway, I have not had any problems with the ones we have ordered and I really like the digital temp meter. I like that I can set it easily and see the current temperature at a glance. Takes the guess work out of turning a dial and constantly checking and re-checking to make sure your temp is where you want it.
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Reviewed in the United States on October 14, 2025 by Jenna Wydeven
Size: 10W(USB)
The thermometer built in to this heater will lie if you have a wattage that is too weak for the size of the bowl / aquarium. We originally bought the 10W for a 1 gallon then we got a 5 gallon and it started getting cold at night. The temperature was saying it was at 80 however the fish was *very* stressed out and the water was cold. We got an external thermometer and found the water was around 74 when this heater said it was at 80. When we got the 30W it started doing really well, keeping it at 80 and saying it was at 80. This heater works really well and is incredibly small when you've got the right size wattage!
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Reviewed in the United States on October 27, 2023 by Philly5.56
Size: 30W
Bought the 30w heater for my 6 gallon cube. I had it set to 76 while I was cycling the tank. Put a thermometer into my tank after 2 weeks and it read 72 degrees. So I assume that it's just inaccurate and raised the set point to 86 degrees. Guess where that got me after 30 hours? You're right! 74 whole degrees! You know what the ambient temperature in my house is? You guessed it! 74 degrees! This thing can't even take the 6 gallon nano cube over ambient temperature? Or should easily be able to atleast keep it 5 degrees warmer than my house. Waste of money, I don't suggest buying this. The built in thermostat on it it says it's at 82.5 degrees but the tank is at 74 degrees i have to throw an a 50w heater in now. I had high hopes because I really wanted something easy to hide in my nano tank, no I get to slap a huge 50w heater in there in complete disappointment. I can't even send it back because I'm past the return window now. But I don't even think this 30w heater could maintain a 3 gallon tank. Manufacturer feel free to get in contact with me about your worthless product. Either you have absolutely no quality control/testing or your just pushing a product that you know is garbage and won't work right. I usually ignore bad reviews when I read them but everyone else with the same issue is spot on.
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Reviewed in the United States on October 15, 2024 by Calamity
Size: 10W(USB)
I got my first of these Heaters near a month ago for my 1gal. Betta bowl. Nifty (neat and easy to use), it's been a perfect fit for the compact bowl space, with a digital control combining thermostat (to set the desired heater temp) and thermometer (to show the actual aquarium temp). Loved it so much, I then got a second one, this for my cylindrical 2gal. community tank which is home to six Guppy/Molly/Platy fishes. Yes, it is overcrowded but I closely monitor the tank's water quality and other parameters as well as the fish behavior there. And all the guys are doing well, as shown by their feeding habits, mobility, even schooling activity. Relying on these Heaters for keeping both of my minimal aquaria at an optimal 80°F I've felt confident that all is well. Until the last day or two… my apartment has cooled somewhat from its usual 75°F or so down to 68°F, nothing drastic. Yet the two heaters now seemed taxed to hold their spaces at the 80°F I've set. Each aquarium now hovers at 74°F, shown by the controls of each heater and verified by strip thermometers, one on each aquarium located up against the heater (at least for the Betta bowl). This is a mildly troubling issue on which I will update this review if warranted.
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Reviewed in the United States on February 20, 2024 by !MiMc !MiMc
Size: 10W(USB)
This review is for the 10 watt heater with USB power cord. I have this mounted inside the built-in filter compartment on a Top Fin Easy Clean 3g tank. I have freshwater shrimp. It works fantastic!
Reviewed in the United States on January 25, 2026 by Anonymous User
Size: 10W(USB)
I was used to a heater that was a little more hefty. I like that this little heater doesn't have a water level but is completely submerged. Also love that it has a gauge so I can control the heat. But it is definitely for a small aquarium.
Reviewed in the United States on December 29, 2025 by Sandra
Size: 10W(USB)
Haven't had time to use it yet, but it is the perfect size tank heater for my needs.
Reviewed in the United States on January 29, 2026 by Wayne Blue