hygger Small Submersible Aquarium Heater 100W Mini Betta Fish Tank Heater with LED Display Adjustable Temperature for 10-20 Gallon Freshwater Saltwater Coral Reef Tanks
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Availability:
In Stock.
Arrives
Thursday, Jul 30
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Size: Medium
Features
- Easy To Hide Compact Design -- Slim flat profile mini aquarium heater measures 4.3''x 1.8''x 0.9'', which is quiet space saving and easy to hide behind filter/wood/rock with two strong suction cups mount. 100W aquarium heater is suitable for 10-20 gallon freshwater/saltwater aquariums, turtle tanks, betta tanks and planted tanks
- Convenient Digital Display -- LED digital readout is convenient and accurate, displaying real time water temperature and indicator light. It will be red when heating, green light when the proper temperature has been reached. Allows you monitor aquarium water temperature at any time
- Adjustable Temperature & Memory Function-- Betta fish heater with external control allows you quick set temperature without getting hands wet especially in winter, adjustable wide temperature range of 59F to 93F in 1-degree increments. Memory function that remembers last setting, so you don't have to reset temperature after power failure
- Safety Shut Off Protection -- small fish tank heater would automatically turn it off and flashing error code if the heater is not fully submerged, which ensure it doesnt overheat and cause harm to your livestock. Shatterproof plastic guard protects fish/turtle from impact and making contact
- Safe Rugged Construction -- Built in shatterproof quartz tube wrapped with two heating element mica plate and nickel wire, along with high-impact plastic housing, hygger fish tank heater ensures the safety of your pets while maintaining proper, constant temperature
Package Dimensions : 6.42 x 5.24 x 1.85 inches; 10.23 ounces
Date First Available : August 14, 2025
Manufacturer : hygger
Best Sellers Rank: #18,784 in Pet Supplies (See Top 100 in Pet Supplies) #35 in Aquarium Heaters
#35 in Aquarium Heaters:
Customer Reviews: 4.4 4.4 out of 5 stars (237)
Item Weight: 10.2 ounces
Manufacturer: hygger
Date First Available: August 14, 2025
Item Package Dimensions L x W x H: 6.42 x 5.24 x 1.85 inches
Brand Name: hygger
Target Audience Keyword: Fish
Color: Black
Size: Medium
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Jul 30
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: XX-Small
CLIFF NOTE VERSION: Both heater work very well. The Nicrew is smaller, less obtrusive, but not adjustable. The Hygger is a tad larger, is adjustable, and has a large red LED readout of the tank temperature. LONG VERSION: I have purchased mini-heaters in the past and they either didn't heat or fried the water. I long ago learned to do the bucket test. I purchased the Nicrew Mini (15 watt) and the Hygger (15 watt). The Nicrew is smaller with a preset stated as 76 degrees F. The Hygger is adjustable with a large LED readout. It is super easy to set. There’s a rheostat type adjuster that’s on the cord. The readout is on the heater. That makes it easy to bump the heat up or down without sticking your hand in the water. The downside is that the light on the heater is noticeable in the tank. You’ll want to hide it with plants or décor if you’re going for a natural look. Both were placed in a 3 gallon bucket of 70 degree water for one hour before plugging in. This is a manufacturer suggestion, and, IMHO, failing to do this is bad for the heater. The room was 70 degrees. I plugged them in and set the Hygger. An hour later both buckets of water were at 74-75. That temp held for 24 hours, even though the room temp dropped to 65 at night. I'm now using the Nicrew 15 watt in a 2.5 gallon tank and I’ve very happy with it. The Nicrew holds rock steady at 74. I'm keeping both heaters. I'll use the Hygger in the winter when the room temp is much colder and I may need to use the adjustable feature to compensate for the room/tank temps. I used a scientific thermometer for my readings. Big thumbs up for both heaters. I suggest you do the bucket test as heaters can vary.
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Reviewed in the United States on April 2, 2023 by Jill Jill
Size: Small
Working well and easy to read... kind of bulky compared to the old glass tube style heaters but the style change is growing on me.
Reviewed in the United States on February 25, 2026 by MayDayJ
Size: Small
Perfect heater and size and features are great for the size!
Reviewed in the United States on February 9, 2026 by Jonathan K.
Size: X-Small
After buying two defective 25 watt heaters from the same company (the first one wouldn't heat at all, the second one wouldn't stop heating and overheated the tank) from Amazon, I switched brands and tried the Hygger Mini. This heater has a digital temperature control, which at first didn't work, refused to go lower and also gave error messages. I plugged it back in a couple of times and it finally booted up correctly and was able to set the temperature I wanted. The thermometer on this heater is off by about a degree and a half compared to my digital standalone thermometers, so I'm keeping the Hygger set at 74 in order to heat the tank around 75 to 75.5. So far, the heater is very consistent and I'm having no issues with it other than the thermostat may be registering a degree or so colder than the water really is.
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Reviewed in the United States on August 2, 2023 by Natalie M.
Size: X-Small
Bought this to replace a heater that did not have a thermostat. Tested it in a 2 gal tank along with a thermometer positioned on opposite wall. Worked great. Put it in my 5 gal tank, set for 80F for my betta. So far so good, no issues. It is behind the foam filter unit so heat is distributed through water and the thermometer on opposite wall is seeing same temp as given on thermostat. Happy with my purchase. Price seems fair to me.
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Reviewed in the United States on April 12, 2025 by MotherSkadi
Size: X-Small
This heater appears to be custom-made for the Fluval Premium Betta 2.6 & 6-gallon tanks. The 50W heater can effectively handle low room temperatures in winter without overheating the tank in summer. Removing the suction cups, it perfectly fits into the rear well next to the pump. Its display shines through the decalled glass to show temperature and activity. So far, it has kept the temperature at 0.5℉ above the set point of 76℉, with room temperature fluctuating from 62℉ to 79℉. With 25W, it should be capable of dealing with winter nighttime temperatures. We do not heat at night, and room temperatures might drop to 50℉. It works accurately and reliably, but it has an indicated 10,000-hour design lifetime. It will indicate an "EL" end-of-life error after that to prompt replacement. This should be listed in the product description. Background: The bundled Fluval heaters have a fixed set point and run the tank at higher temperatures than I prefer. For $22 this hygger is a great improvement!
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Reviewed in the United States on May 22, 2023 by Harald Striepe Harald Striepe
Size: Medium
Temp sensor reads way off about 6 degrees off not even sure if its heating anything or the fish where lucky to be alive by room temp. I got it do to size to fit in the output chamber then have the Fluval M50 in the intake chamber and have the controller on the outside of the tank the hygger 100w help with fitting it and the spot I wanted and so on but not worth it if reading are way off and does not heat well. Update I return the hygger just junk got the EX100 heater from Aquatop 100times better. Ex100 does have no protection devices on it but you can add your own protection shut off the the plug side it's still better then hygger. The EX100 they said could be 1.7F off but in my tank it's only 1.1F off not like Hygger way off and out of control heat ranges hygger has protection devices built in but will not shut off until 95degrees by that time kiss your fish good bye anyway. I recommend the Aquatop EX100 over hygger pretty much all there products are better then Hygger.
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Reviewed in the United States on December 14, 2025 by James VP
Size: XX-Small
This heater is perfect, with lots of safety features built in. I use this in a 2.5 gallon tank. I love that it displays temp at all times and has safety auto shut off feature. WAY better. I sent 3 other heaters back. One nearly killed my fish when it leaked chemicals into the water. I highly recommend this one, and not wasting time and money on the others. UPDATE one year later: This heater only lasts 10,000 hrs, and that's exactly how long mine lasted before "EL" error (which I assume stands for End Life), because code means - yep, it's DONE. So these are disposable heaters. Good if you plan to buy a new one every year.
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Reviewed in the United States on April 27, 2023 by Luls Robs