Aqueon Aquarium Fish Tank Heater, Preset, Up to 30 Gallons, 100 Watts | 30 gallon aquarium heater, fully submersible with auto shut-off, preset 78° and shatter-resistant quartz glass

Constantly running on a 20 gallon mixed reef tank for the past 11 months as a backup secondary heater and worked great. I removed my main heater to for a few hours for maintenance and let this preset heater in the tank only. I noticed the temperature drop to below 75 degrees f (almost 3+ degrees below preset of 78). Contacted Aqueon as it is still under warranty and now they are sending me a replacement unit. Great customer service, too.

This is a good heater, but have had a couple issues. This is my second one. The first one worked great, but after a few months, it stopped working. I ordered a new one, and this one keeps shutting off even though the water isn't that warm. Maybe it's on purpose, because it shuts off around 80 degrees, but I swear the first one heated warmer. My ideal would be about 82 degrees.

Very pleased. I’d always thought aquarium heaters would be expensive and for very serious, high-budget aquarium aficionados. I’m thrilled that I can offer a little heater to my betta! I was worried about his water becoming too cold in winter. Now I can keep his tank warm without worrying about the overall room temperature. Great buy! I don’t love the look, but once you’re used to it, it’s just part of the tank. The alternative is to heat the entire room to temperature at all times, which is just unnecessary, so the aesthetic tradeoff is worth it.

Aqueon is a trusted brand in the aquarium industry. This heater is very convenient because it is preset and has safety features built in. I bought it to maintain temperature in my betta fish tanks but came to find out that it only works correctly if your home is warm enough. To elaborate, the ambient temperature of your house needs to be 73 in order to get your tank to 78. I did not know this before I bought several of these and therefore, my tanks are not at the desired temperature. I feel that this is a design flaw or oversight and really wish that the brand would correct this. How many people really heat their houses to 73 in the winter? Unfortunately, I am unable to heat my house more than 65 degrees. I still use this heater anyway but my betta fish is not living in optimal conditions due to the way the heater was designed. If your house is above 73, I highly recommend this heater. Aqueon makes great products.

Received this product just a few days ago so this is mainly an initial impression. I saw on the product's description that its dimensions were as follows: 3.5 x 1.5 x 7.75 inches. I assumed the length was the full 7.75" and was worried this heater would be gigantic for my 10gal tank! When it arrived, I was relieved to find that it's closer to that 3.5" mark, although probably a little longer than that. The heater warmed my tank to 78 in about an hour from room temp of ~68, so this is more than acceptable for me. Today, after it's been running for a couple of days the temperature of my tank is a pretty solid 78.1* in the center of the tank, which is just as advertised. Hopefully, now the heater stays working well and it can keep its 5-star review! Update after 16 days - I have moved this thermometer to my 28-gallon tank and have been reading the temp every day (along with my water parameters) and found the high to be 78.1 and a low of 77.1 with an average around 77.6. My basement sometimes gets pretty cold at night (mid-60s) and I find even in the morning the tank is above 77.

I thought was good heater, perfect for small tank. In September 2023 1st purchase for 20 gal tank, then bought another for 5 gal tank. No problem for first couple weeks. They worked straight out of the box, then I noticed they were both not maintaining the temp. This morning (10.12.23) both not heating. 20 gal Tank temp down to 73 degrees and heater off, second heater also not on 5 gal tank has 74 degrees, again heater off. Both unacceptable for the tropical fish which require temps at 78 degrees or higher. I unplugged and replugged - that made them both come on, but neither would not stay on. They are completely submerged. Have made steps to return one, but the other is just out of time to return. Both the heaters will come on when unplugged and replugged but fail to stay on to raise tank temp to correct temp. Very disappointing because they are pefect size and 78 degrees is the correct temp. I was lucky to have a backup heater for one tank.

Great for keeping chickens water from freezing in the winter.

Anything from Aqueon seems to work well and last a long time. I needed a new aquarium heater after 8 years with the original one. I don't think that's too bad after being in water for that long! So I ordered the same one again. My fish are happy!

I was shocked about how good this item is. When it first came, I thought it would overheat my tank, but I had to give it a try. So when I placed the heater in, the suction was pretty secure! I was surprised by this, because lots of heaters' suction power does not stick well. It gets better and better! I turned on the heater and I saw the red light. I waited for a few more minutes and the light went down. At first, I thought I didn't plug the cable well, but after a while, I realized it was actually controlling the temperature in the tank. Amazing! It turned on and off, on and off. Then I checked the temperature in the tank. It was perfect! Overall, this heater is a solid 5 star!

Excelente calidad. Funciona perfectamente. Mantiene la temperatura ente 24 y 25 grados. Lo uso en un acuario de 60lts

This Aqueon heater is great. I definitely recommend it to anyone who wants to maintain their tank water at 78°F. I have the 100W heater in my 20 gallon long tank, and the 50W one in my 5 gallon tank. They are sufficient enough that the temperature in either tank never drops below 77.9°F. Keep in mind that the ambient room temperature impacts the effectiveness of the heater, so choose the wattage wisely. During the summer, the heaters in my tanks never turn on because the tanks hover between 80-81°F.

Buen producto, marca me gusta mucho, llegó en buen estado y funcionando bien

me parebe bueno para el precio, cumple bien su funcion.