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  • Hydor 7.5w Slim Heater for Bettas and Bowls, 2 to 5 gal
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Hydor Slim Heater for Bettas, Bowls and Aquariums up to 10 Gal

by Hydor
520 customer reviews
| 32 answered questions

List Price: $11.99
Price: $9.81 & FREE Shipping on orders over $35. Details
You Save: $2.18 (18%)
In Stock.
Ships from and sold by Amazon.com. Gift-wrap available.
7.5 Watt, Round, up to 5 gal
  • Helps guarantee your fish a healthy life by promoting the ideal water temperature
  • Plug and play
  • No temperature to set
  • Can be positioned under gravel
  • 90-Degree Angle for perfect betta bowl fit
18 new from $4.62 1 refurbished from $9.57

$9.81 & FREE Shipping on orders over $35. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

Hydor 7.5w Slim Heater for Bettas and Bowls, 2 to 5 gal + Zoo Med Laboratories AZMBL20 Betta Hammock + Marina Floating Thermometer with Suction Cup
Price for all three: $17.79

Buy the selected items together


Product Description

Size: 7.5 Watt, Round, up to 5 gal

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.

Product Details

Size: 7.5 Watt, Round, up to 5 gal
  • Product Dimensions: 3 x 0.2 x 3 inches ; 3.2 ounces
  • Shipping Weight: 6.4 ounces (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • ASIN: B006JVQ67K
  • Item model number: T20101
  • Average Customer Review: 3.8 out of 5 stars  See all reviews (520 customer reviews)
  • Amazon Best Sellers Rank: #5,038 in Pet Supplies (See Top 100 in Pet Supplies)
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Important Information

Safety Warning
It is always recommended to create a drip-loop when using any electrical appliance in an aquarium. Do not use in a container smaller than recommended.

Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

81 of 85 people found the following review helpful By DSpark on July 23, 2012
Size: 7.5 Watt, Round, up to 5 gal Verified Purchase
I have a small 1.5 gallon Betta tank which I needed a heater for but most heaters are way too powerful for such a small tank. This heater is excellent - it only raises the temperature 5 to 10 degrees which is perfect for this size tank. So in the winter when my home temperature is 68 the heater will raise the temperature at a maximum 10 degress which brings the temperature to 78. You can also bury it under the gravel so it remains hidden. Would highly recommend this heater.
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50 of 53 people found the following review helpful By Lori S on May 7, 2012
Size: 7.5 Watt, Round, up to 5 gal Verified Purchase
Great heater, easy to hide, very reasonable priced. If you have a small tank this is the way to go. I have a 1.5 gallon tank for my betta and its keeping temp at 76-78...he's happy as can be!
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55 of 61 people found the following review helpful By A. M. Lighter on January 11, 2014
Size: 7.5 Watt, Round, up to 5 gal
We had two of these for two 1/2 gallon betta tanks. Despite all the admonitions, it kept the water at a great 76-84 degrees, depending on the temperature of our house. After about 10 months, though, the heater apparently developed some sort of crack that let water into the heating element. We woke up one sad morning to the sound of water bubbling (boiling? I don't know, but the water was bubbling and steaming) and found our poor little guy. The heater was literally melted. After that, I'm afraid I have to caution people again using this one.
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30 of 33 people found the following review helpful By Rum Springa on October 23, 2013
Size: 7.5 Watt, Round, up to 5 gal Verified Purchase
Pros:
1) Inexpensive and stupid simple to install
2) Works well in 3 gallon volume of water

CONS:
1) "Always On": it does not have on/off when it hits a certain temperature thus it will keep raising temperature in a small volume of water. ***BECAUSE OF THIS YOU NEED TO MONITOR YOUR TEMPS CLOSELY, ESPECIALLY IN WARM ROOM and/or SUMMER!!!***
2) DO NOT recommend this heater for anything smaller than 3 gallons, see notes.
3) Even with gravel on top and lots of power cord slack, this heater has a tendency to want to "float" up to about the gravel line no matter how deep I put it under the gravel (have about 3/4 inch gravel on top).

BOTTOM LINE: Solid BUY if for 3-5gallons of water. If you are looking for a Betta tank heater for this volume of water, this is the one to get.

NOTES:
Bought this to initially heat a 1.5gallon tetra aquarium (see review) Tetra 29137 WaterWonders Aquarium Cube, 1.5 Gallons, Blackand it would raise the temp too high for Betta(upto 87F in a room that is about 75F). Moved the fish and this heater to 3gallon tetra tank Tetra Cube Aquarium Kit, 3-Gallon and temps ranged from 77-81F throughout the day. Not sure if that's too "wild" of a temperature sway in 24 hours but my Betta does not seem worse for wear or stressed. Will update this review if something changes.
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44 of 52 people found the following review helpful By Pamela on September 16, 2013
Size: 7.5 Watt, Round, up to 5 gal Verified Purchase
I have a 1.5 gallon fish bowl for my betta fish. The bowl is in my office which is always cold, at least 68 F degrees. I needed the lowest wattage I could find. This is the only flat heater I've seen and it runs both wet and dry. After reading the reviews, I took the advice of a couple of reviewers. I placed the heater on a porcelain dinner plate and put the fish bowl on top of the heater. The heater is between the plate and the bowl, it is not in the fish bowl. It brought the temperature of the water up by 6 degrees, so the bowl is regulated between 74 and 76 degrees. There is no way to tell if the heat pad is on, unless you check the heater itself and keep an eye on the fish bowl thermometer. I took the suggestion of another reviewer and added a cheap wall timer for the heater. I programmed it for 1 hour on and 1/2 hour off. I was uncomfortable having the heater run continuously, so the wall timer is working out well. It took a few days to make sure the heater and the wall timer were both doing their jobs, but so far almost three months later all is good. Hector the betta is happy he has a warmer bowl to swim around in. Good value and gets the job done for a small bowl.
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13 of 13 people found the following review helpful By Buh-Randy on November 8, 2012
Size: 7.5 Watt, Oval, up to 5 gal
I have had no problems so far- the temp seems pretty steady. Came with a little clip for the cord; it stays under the gravel and hasn't cooked anyone/anything yet!
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16 of 17 people found the following review helpful By Amazon Customer on July 13, 2013
Size: 7.5 Watt, Round, up to 5 gal Verified Purchase
This worked fine for the first 2 months, then it quit working. I am very disappointed. I will not buy this product again.
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12 of 12 people found the following review helpful By Jellybeanjea9 on June 13, 2013
Size: 7.5 Watt, Round, up to 5 gal
This works great in my 5gal tank. Hides nice under the rocks. My betta seems really happy swimming around. We keep our house temp 73-75 year round and so far it's working great at keeping our little guy warm.
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Most Recent Customer Reviews

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Hydor 7.5w Slim Heater for Bettas and Bowls, 2 to 5 gal
This item: Hydor 7.5w Slim Heater for Bettas and Bowls, 2 to 5 gal
Price: $9.81
Ships from and sold by Amazon.com
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