HITOP 25W 50W 100W 200W 300W Adjustable Aquarium Heater, Submersible Fish Tank Heater Thermostat with Suction Cup (50W)

I’m really impressed with this HITOP adjustable aquarium heater. I’m using the 200W model for my 100L tank, and it works perfectly. The heater is easy to install with the secure suction cups, and it maintains the water temperature exactly as set. It’s very reliable, and I’ve had no issues with overheating or fluctuating temperatures. The heater is also very quiet, which is a huge plus. I appreciate the quality and value for the price. Highly recommend it for anyone in need of a dependable aquarium heater!

Got a small tank (20 gallons tops) and the water’s getting chilly? This heater’s your lifesaver: just drop it in, twist the little dial to your preferred temp, and it’ll switch on and off by itself to keep the water nice and toasty. No noise, no hassle, and the tiny light lets you know when it’s doing its thing.

Does great keeping my tank a consistent temperature

I was scared when I looked at the reviews, but since no one was stocked with the heater I wanted, I went with this. So far my fish are very happy (and alive) and the heater keeps the tank at the perfect temp. Only trade-off is that the temperature control nob is hard to turn, so I must take the heater out of the tank to do that. I like to keep my tank at the same temp. all the time though so it’s not much of a problem. My fish actually like to hang out near the heater so I think it’s okay. Great for the price, I got a size larger than my tank just to make sure it worked fast.

Keeps my fish tank nice and toasty for them they're always happy things

Delivered promptly. So far working very well as advertised.

Got this for a 20 gallon tank. The knob is excessively difficult to turn, but no matter what I set the heater to, the water temperature is never consistent. The other day, around 7am, I went through setting it up and getting the heater added to my office aquarium. I just have a mystery snail in there right now, so I figured I'd set it to 76 and see how it went. By noon, the water had hit almost 80. I thought at first that maybe the thermometer was wrong, but no - genuinely warm to the touch. And since I placed the heater and thermomenter on opposite ends of the tank (HOB filter in between) it may have been higher. So about four degrees too warm? Turn it down four degrees, right? I turned it down to 72.This morning the tank was 64 (or less; that's just as low as the temperature sticker can read). Puzzled, I bumped it up to 73. The light turned on and i could see the ripples as the water began heating. As of right now, 1:30pm, it's now sitting between 76 and 77 (climbing). I've checked the tank multiple times throughout the day and I have not seen the heating light turn off even once. If it goes past 78, I'm gonna unplug and return.

Works great. Ive had it for a few months now and it is a set and leave kind of thing.