DaToo Mini Aquarium Heater 25W Small Fish Tank Heater 25 Watt with Free Thermometer Sticker

★★★★★ 5/5 Stars I've purchased three of these DaToo Mini Aquarium Heater 25W units and have been using them for quite a while now. All three have worked flawlessly from day one, which is exactly what I look for in an aquarium heater. They are compact, easy to install, and fit nicely in smaller tanks without taking up much space. Most importantly, they maintain stable temperatures and have been completely reliable. I use them in tanks housing livebearers and fry, so consistent heating is important, and these heaters have performed perfectly. My only minor complaint is the suction cup design. I wish the suction cup was permanently attached to the black plastic clip because it can occasionally disconnect when I'm moving plants around or cleaning the tank. It's not a major issue and only takes a second to reconnect, but it would be nice if it were a little more secure. Overall, after owning three of these heaters and having a great experience with all of them, I can confidently recommend them to anyone looking for an affordable and dependable heater for a small aquarium.

For the price I'm actually impressed. This little heater works like a charm and my beta fish loves it. Gives him a little nightlight at night and he really is enjoying warmer water. It is adjustable but on the side of the tank where I have it it isn't super stable, it likes to move around if the cord is touched. But the suction cup works likes its supposed to. At the price I paid I have no complaints, I'm just glad it works. Don't expect it to last forever but who knows, china is stepping up their A game on stuff lately.

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.

I have ordered a ton of these. So far, most of them seem to work pretty well. They keep the tanks around 78F, give or take a tiny bit. You can’t adjust the temperature since it’s preset. I’d like it if they came in a smaller size and also if they had a shatter proof option. These are glass without an outer casing so they might shatter if they overheat. These are not mini but they’re not huge. They’ll work for a 5 gallon tank or bigger. Don’t use these in anything under 5 gallons. They’re too big for that and might overheat. The heaters are easy to use. Just attach the suction cup, place in tank under water, and plug them in.

Have had it plugged in and running for a few days in my 1.5-gallon tank, and it is working great! The red light turns on when heating; green light when it's at temperature (~78° F), which I've been monitoring via a digital thermometer (temperature seems to stay right between 77.5° and 78.5°). I'm not able to adjust the temperature, but 78° is right around the temperature I'll be needing, anyhow. This heater keeps the temperature in the target range, whereas the 10W heater that came with the tank couldn't, as the water was always way too cold previously. The included thermal tape thermometer kind of works, but is not very accurate and it's really hard to discern the colors; it's nice to have, but I'd recommend something else if you need more temperature accuracy than ±5° and you have a larger tank or a colder room. Also, the suction cup fits the heater well and is nice and soft, holding to the plastic tank really well! (I was a little impressed with that, actually.)

Good item that functions as described. The suction however is very poor. The suction cups will not last. It is small and fits neatly where needed. The glass is strong l. Looks nice in small spaces. Easy to install.

Ive gotten this before and it works so good ! The price is so good for how high of a quality. It fits perfectly in my betta fish tank. And it does very well with staying at the temperature that is needed !

I ended up returning this heater. I will either buy a different brand, or just move my betta tank away from the cold window. 1st issue: It recommends a filter with it. Wish I knew that before buying. Heater seems overall like a decent quality for the very cheap price ($7) but just FYI the product states it should be used in a fish tank with a filter, in order to move the water around. Otherwise the heat will stay concentrated in one section and not be effective. 2: Not reliable. I left the heater in a large glass bowl of water overnight and throughout the next day, but it did NOT keep a consistent temperature. The temperature measured between sometimes 78 to 79.5 or even hit up to 80 degrees rather than staying consistent. I noticed it had a hard time staying at temperature and the light would continually change every 30 min indicating that it was heating up again. 3: The section cup it comes with kept coming loose and the heater would float to the top. Helped me best to clamp it down using a chip clip.

Probably my fault more than the product's but this heater is only suitable for quite small tanks. It was working hard to keep a 5.5 gallon tank to temperature. I know if it's on more than it's off that it will shorten the life of the heater. It has now found a home in a 2.5 gallon tank with neocaridina shrimp in it. I just didn't know enough when I bought it and thought it would be okay for a larger tank. I have learned to buy more watts than you need as the heater won't have to work so hard.

Excelente, mi pecera es de un galón y aunque hace bastante frío los peces están a buena temperatura

Cumple con calidad precio Recomendada, solamente el chupon no es tan fuerte

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

Creo que no dure mucho con el, dure creo 3 meses. Al principio funcionó bien, pero cuando realmente lo necesitaba se descompuso, me pasó que el calentador subió a una temperatura realmente exagerada, siempre estaba a 28 grados y subió a 34. Casi hago chicharrón a mi tortuga