Orlushy 25W Small Submersible Aquarium Heater, Constant Temperature Betta Fish Tank Heater of 78℉for 1-6 Gallons Freshwater & Saltwater Tanks

I bought two of these 300w for a 75gallon freshwater tank and have had a 100w for a 10 gallon and I’ve had a very good experience with them. When researching heaters, it seems like no matter what brand or how much you spend, they can all quit at anytime or have a catastrophic malfunction and overheat. In my 2 years with the lower wattage heater, it has been very consistent and not had any fluctuations. I’m confident in the 300w heaters in my 75gal and would purchase these heaters again

works well, temps accurate according to thermometer, fish doing well at 80 degrees.

Works amazing in my 29 gallon holds temp perfectly

I've been using this heater for almost 4 years now in a 75 gal and it's only now starting to have problems. It still heats, it's just permanently set at about 85 degrees now no matter what I change the dial too. Unfortunately for me I've got it in a cooler water tank. If this were a tropical aquarium I don't think I would have even noticed there was a problem. The only downside is that the dial you use to set the temperature is not very accurate, so you'll need to check the temperature with something else when you are getting it set. Easy enough to work around and an acceptable problem to me given the price.

I’ve been cycling my tank now for a week and a half and this heater works wonderfully. Super easy to use and assembly was also just as easy. It heats my 36 gallon very well and isn’t too obnoxious or large since I have mine situated right in the middle of my tank. Just a note for anyone looking: this product says you can submerse it sideways in the description. Honestly I think that is really stupid. I wouldn’t ever do that. I’m sure all the reviews that are saying it lights on fire had the cord part inside the water (aka sideways). I would also leave the adjuster part out of the water if possible. I don’t know, that’s just my dad’s old wisdom talking. Just use it vertical. It works literally the same. This is such a great product. I really recommend it a lot. Great value for money and works just as described. Ready to use out of the box.

This is a huge heater and I like how durable it is. My one sort of complaint is its definitely bigger than I expected. It does fit in my 20 gallon tank, but not with a ton of room. But thr product itself works great to keep my turtle warm.

So, I love this heater because it is sturdy, reliable, and keeps the water temperature nice and warm even when temperatures dip overnight. But most importantly, it's affordable. I'm a broke college student trying to take care of my only quarantine betta fish friend, so price and reliability is of utmost importance to me. That being said, this is a good heater, but it comes with some quirks. 1) The temperature dial is not accurate. This heater tends to run hotter than what it is set to, especially for smaller tanks. For example, right now in my 6 gallon I have it set to 73. This keeps it at 80 degrees consistently, all the time. Make sure you run tests to find out where the dial actually needs to be. I'm kind of used to doing this because most heaters I've found are not accurate in this regard. 2) I think the suction cups are wearing away over time. Hasn't been too much of an issue yet (had these heaters for almost a year now) Quirks aside, for the price I feel you can't beat it and I've been really happy with it so far. Just be cautious and test your equipment before trusting it with live fish in the tank. Same goes for the extra thermometer. I don't really trust these digital ones so I frequently test them with other submersed type thermometers to check them. So far they've tested accurately for me. I mostly use these digital ones when I am acclimating fish to check that the tank/bag temperature matches up.

I’ve had this product for about a year and it still works perfect for my red eared slider turtle. She loves the warmth it provides

It’s only been a few hours since I’ve installed it in my betta fish tank. However he seems to like it a lot. His new hang out spot is right next to the heater.

Nice looking, solid unit. 100W works well in my 20g tank. Tank is in a coldish bedroom and it brought up the temp ~15 degrees F quickly. The separate temp gauge is really handy, almost worth the price alone. Probably will order another unit soon to replace an old one on another tank. (Update - I still like the heater but I think the separate temp gauge isn't accurate - reads higher than two other units I tried)

Exceeded expectations. It is still running after years. This thing is built like a tank

Pictures are blocked by turtles but honestly it’s amazing. A lot of options in temperatures, thick glass indeed and it works later on when I decide to upsize my tank... as of right now I have a 40G and I’ll need to update soon since I added another one. Also the thermometer works, I just drop the sensor in the water and it gives me an accurate reading in F/C.

Best heather I have bought and I have tried many. The temperature control look knob is easy to adjust and works smoothly. The overall quality is great. The glass casing his quite thick and sturdy. Easy to adjust and precise. The thermometer supplied with the heater is also excellent. Great deal, i highly recommend.