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

I have been keeping freshwater aquariums on and off for almost 30 yrs. Heaters have always been the same tech they are now. The BIG takeaway is to keep them cool and constantly sampling flowing water. I have ALWAYS set mine up by the pump outflow and kept them completely submerged. DO NOT keep them plugged in while changing water. This lowers overheating and temperature component shock which leads to a lot of the issues seen in the reviews here. If you have a betta in a setup with no water flow... do not get a heater until you have an actual tank setup. STOP putting these in bowls and expecting them not to blow up.Temperature accuracy and what I have learned with this unit... I keep mine in the pseudo sump unit in the 5 gallon kit I bought. This way water is constantly flowing around the unit. I have an air stone in this same compartment and when it is running it cools the unit more which lead to it running between 80 F - 78 F. When the bubbler is off it cycles and stays a consistent 78 F. So, over agitation can lead to the unit sampling too cool and cycling more. So, I have put my bubbler on a timer and do spaced out 30 min cycles throughout the day. This has resolved the issue with this unit. It needs gentle water flow for accurate sampling and heating. Over agitation can lead to it falsely reading the water as cooler leading to the varied warmer temps.

This is a very nice simple fish tank heater, I use it for when I'm making new salt water for a water change in my reef tank, I do 3 gallons at a time and this little heater has no problem getting the water to just the right temperature.

Keeps my 2 gallon aquarium. Running at a constant 78°. No gripes here gets the job done.

I'm on day 2 with this is my tank.. it holds the water temp between 78°F and 80°F. So far my issue is with the suction cup not holding to the side of the fish tank. I've had to place it back on the side of the tank twice already. I'm really hoping it doesn't bust, as I've been reading several reviews that the glass tube busts and one has busted the fish tank 😖 if it keeps coming off the side of my tank, I'm going to have to look for a more expensive heater for my black orchid betta.

Awesome little heater! I used it to keep my chickens water from freezing. It never stopped working even in the cold. We absolutely love it!

So far so good.. Our betta seems to love it I see him swimming and hovering all around it and he made a bubble nest above it.. so I take that as a positive. My daughter wanted a fish so I did the homework and bought all the necessary equipment and a heater was one of the things we needed for a betta fish. I have a 3 gallon tank to start off with so this mini heater was the size I needed but I was still a bit nervous because I didn't want to cook our fish..so I set everything up and kept and eye on the temp for a couple of days before I actually bought our fish but it's been true to what it says, it turns red when it's heating and it turns green when it stops when it hits 78°F.. I've come to trust it but I still keep an eye on it just to be safe..all in all so far so good I'm satisfied with my purchase.

As most of you know a heater is a necessity for most if not all aquariums and I recently got into fish and wanted to start off easy so as a beginner does I got myself a betta. My tank is 5 gallons and full of live plants and my betta is thriving. The heater heats up surprisingly well and it comes with a preset temp already so no need to haggle with the heater at all just plug and place into your aquarium. It doesn't take much space and it indicates when it's at the ideal temp with a green light. I would rate this a bit higher but I did recieve mine without a suction cup but have ordered a replacement but besides that would reccomend.

Perfect size for our 3.6 gal betta tank. Easy to install and use. Seems to function as it should bcus our tank always stays around 78 degrees. It's preset for 78 degrees. So only turns on when water falls below 78, auto shuts off when tank reaches 78. Seems to be accurate bcus our tanks always reads around 78. Quality seems good. I only wish there was a light or better one if there is one that let's me know it's on, so I know it's working. Worth the price. Great for small tanks.