DaToo 25W Mini Aquarium Heater - Perfect for Small Fish Tanks

Auda w.: This tiny thing keeps an even temp in my 10gallon and is barley viable on the back. The sticker on the glass for telling the temp works great. Even on the cold days I saw it keeps the water at a perfect temp! So happy!

United States on Dec 08, 2023

sb: Small enough for small aquarium and holds steady temperature

United States on Dec 03, 2023

David Schou: This is a good small tank heater. Have it in a 5 gallon beta tank. Stick on thermometer does not seem to work but it was included with purchase. Tank heater works well and shuts off once tank water reaches 78 degrees.

United States on Nov 28, 2023

Katlyn: I used this little heater for my 5 gallon tank and it works excellent.

Canada on Nov 21, 2023

Mike: This is a pretty good small heater. This is smaller than a traditional
aquarium 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't
work out or happened to fail)
I have found that it does not run at the stated 78 degrees, as the room
temp seems to affect it. In a 5 gallon tank, with the room temp at
76.4 degrees, the heater warms the water to 80.4 degrees and keeps it
rock steady at that temp. It tends to cycle ON for 4 minutes, then
turn off for 12-13 mins. The red 'ON' LED is quite dim to see, the
green 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 it
for 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 the
water if left on constant. A work around was to use a electric outlet
timer- set for 30mins on and 1hr off was able to
maintain a stable temp without overheating.

United States on Nov 16, 2023

Rob: Pretty simple setup, submerge in water, stick it to the tank, plug it in and your finished. I have this for a small 2.5 gallon betta tank. It replaced an aqueon 7.5 watt heater which I found pretty worth less if your ambient temp is anything under 70 degrees and anything over 73 degrees. Something I learned quick is you can easily over complicate what is actually needed to keep your tank at a tropical temperature. Too many people say a 10w or even 5w is more then enough for such a small tank. What they don't mention is you need to constantly monitor the temp to stay within range. Then unplug it and replug it in because they don't turn off on their own since they have no built in thermostat.

This heater has been working flawlessly for me. It keeps the tank at 77-78 degrees constantly no matter how cold my house gets. 2 suction cups are really strong. Has a built in LED light that is red when heating and green when off, just make sure you face the printed box on the glass in the correct direction when installing. My only gripe is the dang cord is so short its maybe 3 foot long max. The tank is on a thigh high dresser and the cord isnt long enough to reach the floor where my...

United States on Nov 07, 2020