AQUANEAT Aquarium Heater, 25W Small Betta Fish Tank Heater, Mini Preset Water Thermostat with a Thermometer
$6.58
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Product description
Cautions:
1. Please confirm that the power supply voltage matches the rated voltage before use.
2. For all the glass heaters, please carefully examine whether there is any damaged part before installation. Do not use it if it has a damaged cord or crack and contact with us.
3. IPX8 design, non-detachable, do not disassemble it, otherwise it will damage the heater.
4. The heater MUST be fully submersed under water before plugged in.
5. Unplug it and wait for at least 10 minutes before changing water or taking the heater out of water; it is forbidden to take it out immediately after unplugged.
6. Do not bury the heater under sand.
Tips for Using Aquarium Heaters:
1. To get an even and thorough heat distribution in the tank, it is recommended to place the heater to an area with good water circulation.
2. The aquarium temp will fluctuate depending of the room’s ambient temp so it is normal that it has differences within ± 3°F, and if the room temp is below 60℉, you need to choose a more powerful heater than recommended in the list.
3. To avoid injury, do not touch the heating part directly.
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Customer Reviews
4.2 out of 5 stars 1,137
4.0 out of 5 stars 197
4.3 out of 5 stars 1,667
3.6 out of 5 stars 742
4.5 out of 5 stars 1,904
4.3 out of 5 stars 6,562
Price
$8.49$8.49 $5.98$5.98 $6.98$6.98 $27.99$27.99 $6.99$6.99 $5.99$5.99
Size
6.75″x 0.8″x 0.8″ 2.75“ x1.5” x1.25“ 4″ x2.75″ x1.5″ 8”x5.25”x7” 1.4″D X 2.4″H, 0.4″ 2″ x 1.75″ x 1.25″
Package Dimensions : 5.35 x 2.64 x 2.4 inches; 4.66 ounces
Item model number : G405
Date First Available : July 20, 2023
Manufacturer : AQUANEAT
ASIN : B0CCD6PX96
Best Sellers Rank: #3,025 in Pet Supplies (See Top 100 in Pet Supplies) #8 in Aquarium Heaters
Customer Reviews: 4.3 4.3 out of 5 stars (1,047) var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
Mini Size: The heater is only 4.5” in length making it a great choice for small sized tanks from 3 to 5.5 gallons without taking up much space and obscuring the viewing area.
Easy to Use: The small 25W aquarium heater is preset to 78°F which is a perfect temp for Betta and most of other tropical fishes, and no extra setup needed just plug and play.
Easy to Check: The indicator light turns red when it is heating and it turns green when it is resting so it is easier to do a quick check every day.
Includes: 1x 25W Small Aquarium Heater, 1x Suction Cup, 1x Free Thermometer Strip
Cautions: Always keep it fully submerged under water before plugged in, and unplug it and wait for at least 10 min before you do aquarium maintenance or take it out of water. Do not touch the heater while it is powered on to avoid scalding
10 reviews for AQUANEAT Aquarium Heater, 25W Small Betta Fish Tank Heater, Mini Preset Water Thermostat with a Thermometer
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$6.58
Karyssa –
Works well with less than 1 Gallon and 1 Gallon tanks. Holds at 78°
We bought 2 of the 25w heaters. I was nervous for our EZ Care Marina tank that has less than a gallon. It’s only 0.7 Gal while our other EZ Care Marina tank is 1.35 Gal. To my suprise, after 3 hours of close monitoring, both tanks hold the temperature at 78° F. The heaters auto turn on and off so you’ll see it change from red to green often for maintaining temp. We’re pleased with them and both Betta fish will swim up right against the heaters. It doesn’t seem to burn them and they look like they’re enjoying it. Both very active. I also touched the tanks several times but don’t feel heat. One’s a Dragonscale and the other is an Assorted Koi. Both males. Both have live plants. It’s only day 1 but I wanted other buyers to see it’s safe with less than 1 Gallon. No problems with the suction cups so far. I’d also like to add the room heater is not on and it’s currently early February and easily goes from 40s to 30s at night here. So far, everything looks good!
Maurice Liu –
Perfect for a small betta fish bowl
Bought this for a betta fish we have in a glass fish bowl. Winter rolled around and we don’t have the heater consistently on. The betta started to become very inactive, and worried me regarding its health as its already around 2 years old. Bought this to see if it would help its environment, and surely enough immediately he came back to life! We live in Southern California, so it isn’t freezing temperatures, but definitely cold at night. The heater works perfectly, and I can be at peace knowing the betta is much happier. Make sure to have the entire heater fully submersed under water. Great value for the happiness of the betta!
Jeremy L. Howard –
The fish loves it
Our daughter’s spoiled Beta fish loves the heat in our drafty house. Easy to setup with the suction cup. It seems well made and being small doesn’t take up much room in the small tank. Better than expected for the money.
RosaBianca –
25W too strong for a 2.5 gal tank
This little heater is great. It got right to work and warmed up my tank quickly. Unfortunately, I think it was a little too powerful for my 2.5 gallon tank because it got all the way up to 82 and stayed there. I ended up getting a smaller heater for that tank and will use this for something else eventually, since you can’t change the temperature settings on it. I took off a star for the thermometer strip – it didn’t work at all, and when I removed it from the tank it left most of the black backing and was a pain to pick off all the pieces.
joe shmo –
Cheap tiny heater that lasted 1 year, better than nothing
Purchased back in november 2024 for a 5.5 gallon tank and after daily use it finally died (simply wouldn’t turn on, nothing catastrophic) in december 2025. For a cheap $8 heater a year’s worth of use is about as much I’d expect. I’d buy it again from my experience with it if I really needed something cheap, but the $20 Aqueon preset heaters have lasted me 4+ years consistently (about $5/year or less long term = better deal).
Abby –
Great back up heater!
Very happy with this heater. It’s easy to plug and go. Seems durable for being my hospital tank heater. Will be (possibly) using it for a shrimp tank and will update if i end up doing so! Color blends well instead the tank. Comfortable fit in my 5g!
Brittany –
Perfect for Hospital Tank
just the right size for my hospital tank. amazing price
Gray Rhymer –
Do not use on small tanks!
I have a 5-gallon aquarium and because it houses some tropical fish plus 2 fantail goldfish, it has to have a heater. When installing this heater, the temperature jumped to 80 degrees! In a 5-gallon tank! It’s not the 78 degrees as stated. I could see where it might fry fish in a smaller tank. I will watch the water temperature to make sure it does not get any warmer. If so, I will pull it out. 80 degrees is still a little too warm for me. I can say, it does warm.
Puneet Kumar –
I bought this expensive product for better care of my fishes & shrimp. Instead of maintaining the temperature, as advertised, it overheated the water killing everything in the tank. My beautiful planted tank was ruined. 👎🏼
Devesh –
Thermostat fault.Killed all the fishes by over heating