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Your cart is empty.4.0 out of 5 stars
Betta slim heater helps guarantee your fish a healthy life by promoting the ideal water temperature. Specially designed with the innovative positive thermal coefficient element to heat the temperature of your bowl, aquarium or terrarium an average of 5 to 10-degree warmer than room temperature. Whether it’s a glass, plastic or acrylic tank with fresh or salt water, this product is great for creating a more livable environment for your Betas, Glowfish and many other kinds of fish and reptiles.
MaddieC
Reviewed in the United States on January 29, 2025
I looked at lots of heaters for small tanks before landing in this one and I highly recommend this little heater. I really like the flat design which I was able to “hide” it under the rocks at the bottom and my betta enjoys swimming around the cord. It’s also very simple to use: plug in and go. So far it’s been working well with no mechanical issues and the price is fantastic.
Jesse Mae Dalton
Reviewed in the United States on January 19, 2025
Perfect for a small beta tank and inconspicuous.No thermometer but fish always happy with temperature and swimming around.
Pam Alonso
Reviewed in Mexico on November 23, 2023
ES BUENO EL CALENTADOR, YO LO COMPRÉ PARA UNA MINI PECERA, PERO CUANDO LO CAMBIÉ A UNA PECERA DE 6LTS YA DEJÓ EL AGUA TIBIA, FUNCIONA PERFECTO PARA UNA MINI PECERA DE 4 LTS O MENOS
Lillibetz
Reviewed in the United States on March 3, 2019
I have had two of these 15w for both of my 3.5 gallon tanks for my betta fish for a year. I have about an inch of gravel that I buried the heaters under, they are centered in the bottom of the tanks. Each tank has a small hide and some random foliage. The tanks have a filter and a light. My home temperature varies between 64 degrees and 78 degrees throughout the year depending on the time of year and day. These heaters have consistently kept my tanks between 78 and 82 degrees. My bettas are very active, healthy and happy. I have not noticed any slime build up on them or the cord. Speaking of the cord, it’s long making it easy to reach an outlet and keep it buried in the tank. The suction cups it comes with help to keep the cord in position. I did try the smaller watt but it was not sufficient enough and didn’t heat the 3.5 gallons of water more than 72-74 in my home during the summer when my home was generally between 76-79 degrees. I recommend this 15w for any tank up to 3.5 gallons more than that and I can’t say as I haven’t any tanks more than the 3.5 gallons. The tanks I am using this in are the Top Fin: Enchant 3.5 gallon.
Techfox
Reviewed in Canada on July 29, 2016
I have 1 gallon tank for my betta . I bought this heater with the expectation that it can keep the temperature ideal for its survival . I have a thermometer that is immersed in the tank to monitor the temperature all the time . If I keep this heater switched on for some time, the temperature keeps on rising to reach over 29 degree Celsius. I was really shocked to discover this . I stopped the heater immediately as I saw it at 29.4 degrees . If I didn't stop it , this might go way over that for sure .When I did some research on betta on internet, I found the ideal temperature range for betta is between 25.5 to 26.5 . The temperature must not go beyond 27.5 or fall below 22.5 degrees . Like lower temperature, higer temperature can also effect the betta health badly . Such high temperatures ( 29+) can promote the growth of microbes in the tank leading to diseases and secondly it increases the metabolic activity of betta which can lead to rapid aging .It looks like this heater is unable to detect the water temperature . The only thing it does is to keep on increasing the temperature. Is the manufacturer expecting us to sit 24/7 in front of the tank to switch it on / off to get the temperature in this ideal range ?I will not recommend this heater . It will be better to find another one that can maintain a steady temperature.Update - after extensive search on Amazon, I found this heater - Marina C10 Compact Heater, 10-watt. This Marina's heater can be the best alternative and satisfy all the requirements of a good heater according to my experience.
Amber Miller
Reviewed in Canada on July 12, 2016
Bought two 15w for my 20 gallon long tank divided x3(3 dividers, 4 bettas) and it keeps all sides a constant 80F, I have them placed underneath the gravel, picture will show where I put them(the red dots)Update July 13: So I've noticed when they are placed underneath or on the sides of the foam dividers that they leave gaps, which I can't have since I'm putting betta fish into there and don't want to run the risk of them mauling each other. I wish these would have worked out as A: They were small and compact and B: They put out a nice warmth that I could feel while I opened the hood of the tank
Customer
Reviewed in Canada on February 25, 2016
I used this in a 1gal bowl for a while, til I upgraded to a 5gal tank. It kept the 1gal bowl at about 25C (77F), but the 5gal reaches 22C (72F) max. Perfect for a small bowl, not anything larger.
Rhiannon
Reviewed in Canada on October 28, 2015
I bought the 7.5 watt option for my 3 gallon mini-aquarium with live plants and it got the water to about 71 degrees F. I wanted the water to be a little warmer than that, so I more recently bought the 15 watt for my tank in time for winter. It gets the water to about 77 to 78 degrees F, which is right on the money for a betta. If your tank is smaller than 3 gallons, I would recommend the 7.5 watt. I have never had any problems with these heaters and I love that they can be concealed under the gravel. Two fins up from Sharky!!
Brian
Reviewed in the United States on June 5, 2014
I setup a 5.5 gal Betta tank on my desk at my office and since the tank was smaller I wanted to try to hide the heater as much as possible. I decided on the Hydor since it was fully submersible and was told the heater cold be buried under the substrate. The heater arrived and upon first inspection everything looked good. The heating pad was nice and wide and even pliable. The cable was long and came with a cable guide and suction cup to help route the wire. Once in place the heater appeared exactly as I wanted, invisible except for a cable running up the side of the tank.Once it was in the tank initially everything was fine and the the heater would get the tank to a respectable temperature such as 78 or 80. Over the course of a few weeks and season change I noticed the temperature would fluctuate from 68 to 84 degrees. I will not fault the heater for the fluctuation. The heater did exactly what it was advertised to do and did it well. The wide fluctuation is entirely do the the ambient temperature in our office. During the winter months the ambient temperature is very warm and this caused the tank to get hot since this heater is always on. Now that summer has come the AC is running and it s very cold and the 15w heater just doesn't have enough power to heat the tank.Pros:SlimCan be hidden.Under the right ambient temperatures I feel like this heater would work fine for small tanks.Cons:There aren't many cons to this product however it seems the useful application of this heater is very limited.
RushManZer0
Reviewed in the United States on October 5, 2014
I've purchased 3 different types of Betta heaters for the various Betta I take care of. This particular heater advertized that it "Helps guarantee your fish a healthy life" but let me tell you how wrong they are. This is the only heater out of the 3 that I've used that has actually burned my Betta's fins... Quite badly. He was a beautiful fish and it was sad to see him suffer like that. This is in no way a safe heater for your Betta. I don't usually like to write 1 star reviews, but I really want to warn those of you out there looking for a heater not to get this particular product. It will damage your beautiful Betta if not kill him. The other heaters I'm currently using are the Marina 8w Betta heater and the National Geographic 10w & 25w heaters. They don't burn the fish in any way and they are fully exposed to the fish. I hope my fish can survive the burns... Please avoid this product if you want your fish to actually have a "guaranteed healthy life." Update (5 days later): I removed the heater immediately after I noticed my Betta was burned (about 3 days after I got the heater.) At first I took my Betta to the local exotic fish and reptile store so they could tell me what happened to the fish and how to help it. They said that the Betta appeared to have been burned by the heater and informed me that they've seen this before. Apparently this frequently happens when people purchase a cheap heater over the internet. The store employees then recommended a product called Melafix by a company called API. They told me it was a 7 day treatment and could help regrow his burnt fins while preventing infection. However, 5 days later my Betta passed away from its wounds. I'm really sad about it. I hope this story prevents this from happening to a future Betta owner.
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