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Hydor Slim Heater for Bettas, Bowls and Aquariums up to 10 Gal

3.8 out of 5 stars 763 customer reviews
| 92 answered questions

Price: $11.28 & FREE Shipping on orders over $49. Details
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
13 new from $8.99 1 used from $10.99

Marineland Starter Kit
$11.28 & FREE Shipping on orders over $49. 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
  • +
  • Marina Floating Thermometer with Suction Cup
  • +
  • Tetra 29095 Cube Aquarium Kit, 3-Gallon
Total price: $53.18
Buy the selected items together

Special Offers and Product Promotions

Size: 7.5 Watt, Round, up to 5 gal
  • Buy Used and Save: Buy a Used "Hydor 7.5w Slim Heater for Bettas and Bowls, 2 to ..." and save 8% off the $11.99 list price. Buy with confidence as the condition of this item and its timely delivery are guaranteed under the "Amazon A-to-z Guarantee". See all Used offers.

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
  • Shipping Weight: 1.6 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 (763 customer reviews)
  • Amazon Best Sellers Rank: #5,822 in Pet Supplies (See Top 100 in Pet Supplies)

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

Top Customer Reviews

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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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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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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Size: 7.5 Watt, Oval, up to 5 gal Verified Purchase
Awesome little heater. I have a footed one gallon fish bowl and this almost did not fit at the bottom of the foot. I had to arch it a little but it is still nicely hidden under my glass stones. I had originally purchased the Cobalt Aquatics 5 watt heater that attaches to the side with a suction cup for fear the under gravel type would not fit in my bowl. That was a fluke, stopped working in 2 days, says it's fully submersible.... it wasn't and only worked when it wasn't in water. That one was also twice the price as this one. Greatly satisfied with this purchase, and the cord has a little suction cup to keep it from floating around, awesome feature. A lot easier to hide behind plants than the Cobalt Aquatics 5 watt mini heater as well. Great buy and would defiantly recommend to anyone with a smaller bowl or tank. My Betta started making a bubble nest mere hours after installation. I used the extra money I got from returning the other heater to purchase some mini marimo moss balls. Win win for me.
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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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Size: 7.5 Watt, Round, up to 5 gal Verified Purchase
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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