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

by Hydor
3.8 out of 5 stars 659 customer reviews
| 51 answered questions

List Price: $11.99
Price: $10.58 & FREE Shipping on orders over $35. Details
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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
15 new from $9.49 1 used from $9.52

Marineland Starter Kit
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Frequently Bought Together

  • Hydor 7.5w Slim Heater for Bettas and Bowls, 2 to 5 gal
  • +
  • Marina Floating Thermometer with Suction Cup
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  • Zoo Med Laboratories AZMBL20 Betta Hammock
Total price: $17.56
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Size: 7.5 Watt, Round, up to 5 gal

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 (659 customer reviews)
  • Amazon Best Sellers Rank: #1,219 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 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, 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
Should have bought this last winter when our betta almost croaked. The device works kind of like an electric blanket element, except it's a semicirclular plastic disc that is very warm when it's plugged in. At first we placed it under a standard glass fish bowl (and on top of a ceramic plate), which raised the temperature of the water about 3-4 degrees Fahrenheit. That was sufficient in the early fall, but as the temperature has dropped I found that it doesn't keep the temperature high enough, because the glass lip at the base of the bowl prevents the plastic disc from completely touching the bottom of the glass. Now I have set it up so the disc is pressed to the outside of the glass bowl, wedged between the bowl and a ceramic cup (I am attaching a photo of the setup). It's not perfect, but the fish likes it better as we see him hanging out next to where the disc is pressed up against the bowl.

In terms of dropping the disc into the water, we haven't tried and I don't want to risk it. Our bowl is too small (maybe 2 gallons capacity, but we usually keep it half to 2/3 full) to submerge the disc -- I think it would heat the water too much and kill the fish (as others have reported).

UPDATE: I decided to submerge the heater underneath the stones at the bottom of the tank after the exterior heating method described above failed to keep the water warm enough at night. The submerged heater under the rocks raises the temp in the 2-gallon bowl about 8 degrees, compared to 3 degrees using the exterior method. We'll keep it in there throughout the winter.

I am giving this product 4 stars based on price and convenience, but the design is flawed -- the cord exits the disc at a 90 degree angle instead of being flat, which limits the possibilities for pressing it against the exterior. It would also be great if there was some way to easily clip or attach it to the exterior of a tank.
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Size: 7.5 Watt, Round, up to 5 gal
I'm a busy lady so when I take the time to review a product- it's important to me.
I bought this little heater about a year ago for my
grandsons first pet- a fish, A pretty red Betta.
Hooked everything up and the new tank water stayed warm after adding this small warmer.
Fast forward to Last week .....our fish seemed sluggish and kept declining. He died this morning after watching him for 3 days-- taking less and less breaths. I thought he must have been really old when we bought him from the left store(a yr ago)
About an hour ago, I put my hand in the tank to get our fish(Paul Walker) - and the tank is very cold. I looked at the thermometer and its reading 70 degrees.
No wonder he died! I'm so upset that he had to die this way. Yesssss it's just a fish! It was a
Fish for my grandson to love and enjoy. He's quite upset!!! Honestly- as weird as it is, I'm sad too. I watched him decline like I was watching some poor soul in hospice.
I can't help but think that this might have been prevented if this little Betta and bowl tank warmer hadn't quit working. I will NEVER buy from this company again.
Think twice if you care for a fish- more than it just being a fish!
Thanks for reading...and don't buy it!
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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: $10.58
Ships from and sold by Amazon.com