Mini Aquarium Heater 25W Small Fish Tank Heater 25 Watt with Free Thermometer Sticker
Price:
(as of – Details)
Product Description
The Smallest 25Watt Aquarium Heater For Your needs
Specification:
Power: 25WattVoltage: 110V~120V/50~60HzHeater Size: 4.9*0.9*0.9inchPower cord: 3.9ftApplication: 1 to 6 gallon aquarium
No Need To Set
DaToo MINI 25W Aquarium Heater will automatically keep the water temperature constant at 78℉. Simple and convenient, very suitable for beginners.
The Smallest 25W Aquarium Heater
Only 0.2 inches in length, the smallest 25W heater on the market. No matter how small your fish tank is, it can easily meet your needs.
Rubber Sealing Layer
Unlike traditional plastic seals, DaToo uses a rubber sealing layer for better sealing and safety performance, and will never leak electricity or water.
Quartz Glass Material
Explosion-proof and crack-proof, more sturdy and durable, without worrying about damage.
Free Sticker Thermometer
No additional purchase required, easy to know the temperature of your tank, very fast and convenient!
Suitable For 1-6 Gallons
This heater is ideal for 1 to 6 gallon small glass or acrylic desktop aquariums. (Note: When in use, it needs to be submerged 100% in water.)
Package Dimensions : 5.43 x 2.8 x 2.28 inches; 5.11 ounces
Item model number : DT-25A
Date First Available : July 17, 2020
Manufacturer : DaToo
ASIN : B0893T67LX
25W Betta Aquarium Heater: Creating and maintaining a perfect and comfortable water temperature for our cute fish is not easy, which requires a lot of effort. Now DaToo MINI 25W Aquarium Heater can help you make this easier. Precise and constant temperature, no need to set, keep the temperature of fish habitat in the best state at all times. You will find it very easy and happy to take care of pet fish!
Precise And Constant Temperature: No need to set, DaToo Fish Tank Heater will automatically keep the water temperature of the fish habitat at 78℉. This temperature is very suitable for betta and most tropical fish. When the water temperature is lower than 78℉, the heater starts to heat and the red light is on. When the temperature reaches 78℉, the heater stops heating and the green light is on. DaToo will always maintain this comfortable temperature for your beloved fish!
The Smallest 25W Betta Heater: For most fish lovers who have small fish tanks of 1 to 5 gallons, a small heater means more space for fish. This is the smallest 25W aquarium heater on the market, only 0.2 inches. No matter how small your fish tank is, it can be used perfectly in it, and you can’t even find it. Very MINI!!
Safe And Durable: Unlike traditional plastic seals, DaToo uses a rubber sealing layer, which ensures that DaToo has better sealing and safety performance, and will never leak electricity or water. Quartz glass material, explosion-proof and crack-proof, more sturdy and durable, without worrying about damage.
One Year Warranty & Satisfaction Guarantee: This heater is ideal for 1 to 6 gallon small glass or acrylic desktop aquariums. When in use, it needs to be submerged 100% in water. We provide one year warranty and 24 hours professional customer service. Buy With Confidence!
Customers say
Customers find the thermometer works well for small tanks and is a good value for money. They are satisfied with its quality, but opinions differ on temperature, glass breaking, and suction cup quality.
AI-generated from the text of customer reviews
11 reviews for Mini Aquarium Heater 25W Small Fish Tank Heater 25 Watt with Free Thermometer Sticker
Add a review

Jrny –
Perffect, Simple NO FUSSS Fish Tank Heater
The PERFECT fish heater for a simple tropical small tank. No fush involved, no managing the temperature reading. Quite a value and works exactly as you need it to with a simple design for a consistent temp for your fish babies!
Daniel E Donohue –
Great price, works well
Great in beta tank. Nice little heater for great price
Mike –
Nice little heater
**Update- this heater keeps a rock solid temperature and works well ina 5 gal tank. Fyi- before doing a water change, be sure to unplug it andafterwards give it 15-20 mins before plugging it back in. This will let theglass cover stabilize and minimize a change of it cracking. Good heater!!This is a pretty good small heater. This is smaller than a traditionalaquarium heater, and you can’t set the temperature as its preset.(I did buy the temp adjustable DaToo as a backup in case this one didn’twork out or happened to fail)I have found that it does not run at the stated 78 degrees, as the roomtemp seems to affect it. In a 5 gallon tank, with the room temp at76.4 degrees, the heater warms the water to 80.4 degrees and keeps itrock steady at that temp. It tends to cycle ON for 4 minutes, thenturn off for 12-13 mins. The red ‘ON’ LED is quite dim to see, thegreen OFF LED is a bit brighter, and the cord is on the short side.Am using for a Betta and so far so good, will be keeping an eye on itfor reliability and how accurate it maintains temp.Before this, I was using one of those constant-on 5-watt heaters,in a 2.5 gallon tank. It did a good job but tended to overheat thewater if left on constant. A work around was to use a electric outlettimer- set for 30mins on and 1hr off was able tomaintain a stable temp without overheating.
SMALL AQUARIUM OWNER –
MINI AQUARIUM HEATER THAT WORKS
I have a large glass bowl that I use as an aquarium for my small tropical fish and I got this heater to use in it because it is only 2-3 gallons in size and this heater is perfect for it. It works great! I have purchased small heaters before and had trouble with them i.e. not really able to control the temperature well, but this one seems to be working great and keeping the temperature right at the correct level for my tropical fish without overheating the small tank. So I am happy with it. It came with a free stick on thermometer which didn’t actually work i.e. the temperature would not show on it so I pulled it off the side of the tank to throw it away and it left sticky residue on the outside of the tank which was difficult to remove. I think it was included so you could verify that it was keeping the temperature at the right level. So the small stick on temperature strip was a failure but using a regular thermometer in the tank shows that it is keeping the temperature at the correct level and the heater itself has a little indicator light which shows when the temperature is safe (green) and when it is too hot or cold (red) and that works. So I threw the temperature strip away because it did not work and with some difficulty I finally got it off the side of the tank. It left little sticky bits behind on the glass that I had to scrape off. But the little heater works great and has its own internal safety indicator light where red equals out of safe range and green means it is safe and that does work. But the external strip thermometer didn’t work and when I tried to remove it from the outside of the tank it was difficult to get the sticky adhesive off the side of the tank as some of it pulled off the little strip and stuck to the exterior of the tank glass and was difficult to remove from the glass. So I threw the small thermometer strip away as it was useless i.e. no temperature showed on the strip after a full day but the heater itself is great.
Maggie Cook –
Great little heater
Great little heater for small tanks. Very durable and nicely built. Easy to use. Waterproof. Easy to clean. Color blends into back of aquarium or scape. Readability is accurate.
Kevin –
It does the job
The heater keeps my 3-gallon tank at a steady 78°F, and itâs really small, which is great. But it takes a while to heat up at first. Works fine once it gets going, but I expected faster warming.
Lawrence R Berger –
Great little heater, great price.
Easy and efficient heater. Drop in water, attach to glass, plug in and heat to roughly 79. Great price. Have bought 2. When you want to take out, unplug, let sit for 5-10 min to cool and remove. Not sure why people are getting burned. Follow instructions.
Ivy Reisner –
Cute, small, easy to tell that it’s working perfectly
I’m using this for a 3-gallon shrimp tank. It’s tiny. It’s cute.There is a very belt-and-suspenders approach to being sure this thing is working properly. It lights a little even when it’s not heating the water (I expect it’s not heating the water when the room is nearly 90 degrees in August). The light is really only visible when the tank is dark and there isn’t too much light in the room, but it’s a small square by the bottom, just to clearly indicate it is working. I like that assurance. The little thermometer, which is also tiny and out of the way, would be another indicator, again if it weren’t August and showing the water temperature in the 80s without the heater. So you can be certain, if there is a problem, you will know.But the ambient room temperature does lead to another point. It’s small and I don’t think it’s that powerful. For me, the room is never going below 70 degrees. I’m in an apartment building with a lot of elderly residents, and the super needs to keep the place warm bordering on hot for them. I need the heater. The water will get too cold for the shrimp without it. But not more than say 10 degrees below their comfort level. If you’re thinking a tank in say a garage (I know some people who use that as an office and keep a betta there) and you’re prone to reasonably cold winters, then this might not be the thermometer for you.The shrimp seem to think it’s a nice platform to sit on. I usually find at least one perched on top.I like especially how deep I can store it and the suction cups keep it firmly in place. If I’m only doing a one gallon water change (they’re shrimp — they have a really low bioload so changing a gallon a week is fine) then I can keep it plugged in while doing the water change and it stays fully submerged the entire time.
Christel Barton –
im new to these types of set ups but this has never failed to show up this tank heats it like nothing and it cools down as well. I have no worries
Quartz –
Good product and quick delivery
Katrina –
Perfect for my little betta, I am using it in a 1 gallon fishbowl with a filter and he is much healthier and more active in the past few weeks since I installed the heater.