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

Works great in our 10 gallon. The dial knob at the top to adjust temperature can be a little tricky though. There is a 4 degree label gap between temps so you have to guess. Ex) 78-(gap)-82. So if you want 80 degrees, you adjust the dial in the middle of these two numbers. Not a big deal, but with me being new at fish keeping, I worried it wasn’t at perfect temperature. Other than that, it’s a good product!

This submersible fish tank heater is fantastic! It was easy to set up, keeps the temperature consistent, and the safety features like auto-shutoff give me peace of mind. My fish are more active and happy since I started using it. Sleek, quiet, and perfect for my aquarium—highly recommended!

I’m really happy with this adjustable aquarium heater! It maintains the perfect temperature for my fish tank, and the 50W power is ideal for my setup. The thermostat is easy to adjust, and the suction cup keeps it securely in place. It’s compact and doesn’t take up much space in the tank. Overall, a great investment for keeping my fish comfortable!

Had to go a few degrees higher to get the 76 I wanted but it heats and it works. Good heater if you’re on a budget.Update: only lasted 4 months and quit heating

arrived quickly , functions as advertised , the way you adjust the temperature is not the most accurate, so you will have to estimate and wait and see what direction you need to go to get it where you need it to be but after that it works great for small tank , also it need to be fully submerged , no part should be above water line , this is clear in instructions .

I've been using this heater for 4 months now. I wanted an adjustable heater since I keep my house cooler. I wanted to keep my tank on the cooler side of ideal so that the tank isn't heating my house. My only real complaint about the heater is that the bottom cap kept falling off. It's just a plastic sleeve. I took a silicone one off an old heater that I was tossing and am using that instead. Really, the cap isn't necessary unless you're worried about the glass banging into stuff. The clips are holding well. Make sure you are clipping near the light and above so that the plastic isn't in contact with the heating element at the bottom. Temperature of the tank has stayed consistent. Oddly, even though the heater is black, when it is submersed, the top becomes a light gray. I wish it was black, but that doesn't affect how it works. I would be happy to buy another one if I needed to for another tank.

PLEASE DO NOT BUY THIS! I just had a devastating loss in my tank because this thing decided it wanted to get hot and melt all all the plastic clips. It probably shocked my entire tank!I just did a water change on my 10 gallon tank. I always shut down my heater, filter, and air bubblers. Once the water gets high enough to cover the heater, I start everything up again. Jesus, I had just put the last gallon of water in the tank and all I could see was smoke. I thought it was my light, but it was coming out of the water because everything was melting. I switched the main power button on my surge protector. My fish started flopping and sinking to the bottom. I had a net that I was able to catch a few tetra fish that were at the top. My shrimp darted to the top of the tank, then nose dived to the bottom and turned upside down.I am so upset right now. I just lost 5 fish and a dozen shrimps. Probably will lose my assassin snails and two other tetra fish that I was able to get out of my tank. I have several pest snails that are now laying on their sides that will probably die. But those are not such a big deal. I spent nearly 6 months on this tank getting everything right. I just didn't have a heater, and opted for this one because of all the "Wonderful Reviews". Don't do it people.I am adding photos, not of my fish that were loss.

No SurprisesNo IssuesNo Problems

Will be happy if it lasts at least 5 years