YukiHalu USB Powered Aquarium Heater, 10W Adjustable Mini Fish Tank Heater with External Temperature Controller, LED Display, Used for 0.5-1 Gallon Tank (10W USB)

So far this little heater is working well in my 2 gallon tank. Showed 75f when first turned on. It got ip to temp(79f) within about 30 minutes. I then double checked the water temp with a temp gun and a stick style thermometer x and both read within 1 degree of the heaters reading. It's been running now for almost a week and keeps a consistent temp.. It's super small, and doesn't really take in much space, as can be seen in the pict (behind the rock)

Won’t turn on after abt maybe 30 mins of using it at the temp of 78. Fish tank cold again. Very upset. No power to it at all. Not happyEdit-They sent me a replacement heater & I received it in a day. I went to go wrap up the old one that didn’t work n burnt my finger….so….apparently that one IS working but didn’t for days…? idk I tried it for days w the heater in the water n it wld not turn on. Took it out of the water now to pack it up etc, unplugged it, grabbed the new one to set that one up and when I grabbed it the heater was burning hot. Huh. So I plugged that one bck in and what do u know…. Digital screen wrkg, all is well. Idk. I still packed that one up to send bck obvy bc I don’t want to hurt my lil fishy if it’s malfunctioning.I appreciate they sent me a new one so quickly!! And will see how this one goes!!!((This lil guy was a “surprise for my son by my niece so this is obvy his temp home until I can order a larger Fishtank for him n toss this one out lol can’t imagine drinking lemonade from it again……..))

The product works as it says it would. If there is a drawback it is that it has to have the plug in power adapter that is Adatper: 10W / 5V / 2A. I tried a 1A and it would not raise the temperature. The directions say it must be 10W / 5V / 2A. And they aren’t kidding. I did not have one with this rating so I had to purchase one. If you are in the same situation consider the extra cost. They are very plain in warning us about the correct adapter

Used in a brine shrimp hatchery. Small size makes perfect to maintain accurate temperature. Controls are easy to use.

I bought this at the end of May, that end of June I went on vacation for a week. I returned to the heater broken open and the black sand stuff all at the bottom of my cycling tank. So glad I did not have fish in my tank! Will not buy again.

I have a USB outlet near my desktop 2 gallon fish tank. I like that I can set the desired temp and not worry about long cords powering a bigger heater and so forth. It's very small and doesn't intrude on viewing the fish.

Idk, just not exactly what i was expecting. I feel shortchanged a bit, and maybe its my fault for having these high expectations, but the temperature that reads on the little controller is not the temp in the water. Kinda makes that a bit useless. You set it to 82 and even if the water is 69 degrees youll see the thermometer just running up by .2's at a time pretty quickly until it hits 82. So if that thing is even accurate I assume the temperature reading is the temp of the element inside the heater. Which can be misleading because that does not mean the temp in the water is that temp. Also i read somewhere it was supposed to come with a little stick on thermometer for the outside of the tank also to help in knowing the temp in there but I did not receive any such thing. Just this contraption in a box. Element does seem to get hot in the tank like it should, I just doubt its ability long term to provide any kind of stable temps when put under the test like seasonal weather changes. But i guess it works?

So far this is working fine. Testing it in a 2 gallon bucket for a week. Slow to reach set temp and without water circulation actual temperature of water a couple of degrees below. I used a 12 watt usb charger. I think it will be fine for my planned 2 gallon planted tank. Don’t know if it would work for a Betta tank but I consider 2 gallons too small for fish.

Excelente producto, ayudó mucho a regular la temperatura de la pecera para mi betta y que quisiera comer.

Me ha gustado mucho ya que no ocupa casi espacio y funciona bastante bien, lo recomiendo

This heater is perfect in my 2.3 litre set up for my sea monkeys. It has been quite cold here in the UK but they are toasty in 74° F

Good for small tank.

The heater requires some power, so struggled to find a usb plug powerful enough. Do not buy! Definitely not worth the money!