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Fluval Marina Submersible Heater for Aquarium, Mini

by Marina
4.1 out of 5 stars 84 customer reviews
| 20 answered questions

Price: $14.99 & FREE Shipping on orders over $35. Details
In Stock.
Ships from and sold by Amazon.com. Gift-wrap available.
25-watt
  • Mini, 25 Watt submersible heater for fresh or saltwater aquariums
  • Easy to read temperature settings
  • Impact-resistant glass design; Water proof sealing
  • Includes bracket with suction cups for easy, secure installation
  • Length: 6 Inch
3 new from $14.99
$14.99 & FREE Shipping on orders over $35. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

  • Marina Submersible Heater for Aquarium, Mini, 25-watt
  • +
  • Marina Floating Thermometer with Suction Cup
  • +
  • Zoo Med Laboratories AZMBL20 Betta Hammock
Total price: $22.24
Buy the selected items together


Product Description

Size: 25-watt

Small yet powerful, the mini 25-watt Marina Submersible Aquarium Heater provides reliable heating for fresh or saltwater aquariums up 5.5 US gallon aquariums. The heater includes many practical features for easy use, safety and convenience, including an easy-to-access temperature set dial, on/off pilot light indicator and a bumper guard for fish safety. Made of durable high-impact glass, it's built to last under normal aquatic conditions.

Product Details

Size: 25-watt
  • Product Dimensions: 1 x 1 x 6 inches ; 6.4 ounces
  • Shipping Weight: 11.2 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: B00AFELT92
  • Item model number: 11230
  • Average Customer Review: 4.1 out of 5 stars  See all reviews (84 customer reviews)
  • Amazon Best Sellers Rank: #3,994 in Pet Supplies (See Top 100 in Pet Supplies)

Customer Reviews

Top Customer Reviews

Size: 25-watt Verified Purchase
I was looking for a compact aquarium heater to fit into the filter outflow compartment of my Fluval Spec V tank (5 gallons), so it wouldn't be visible in the main body of the aquarium, but my choices seemed like either the non-adjustable, black plastic encased Fluval/Marina for $22-25, a $20 Hydor heater with no protection on the body of the heater, or a $28 EHEIM. If money was no object, I'd have gone with the EHEIM with its superior reviews and reputation, but I didn't want to spend that much and decided to give this Fluval Marina heater a try. I've only had it in the tank for about 10 days, but so far I like it.

PROS:

- Price - very reasonable, half the price of the better/more expensive heaters, at fourteen bucks
- Compact size - easily fits in my Fluval tank's filter compartment
- Adjustable temperature for the price of a fixed temperature unit
- Plastic bumper on bottom of the glass barrel protects the heater from impact.
- Heats a 5 gallon tank up to 76*F, might do 78 if I twisted the temperature knob all the way to the right.

CONS:

- Unknown reliability. So far, so good, but a few weeks is too little time to tell. I'll come back in a year or so (hopefully not earlier with bad news) and update.
- The heater is just adequate to heat my 5 gallon tank to the lower end of typical tropical fish temperatures. I would not think of using this in any tank over 6 gallons, but then again, it's only designed for up to 5.5 gal tanks.

CONCLUSION:

So far, this heater appears to be exactly what I wanted. It fits my Fluval Spec V perfectly and does the job it's supposed to do. I've got no real criticisms, so it gets 5/5 stars until/unless my experiences change (hopefully they won't).
3 Comments 19 of 19 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Size: 25-watt Verified Purchase
I've had this for 3 months in my 2.5gal betta tank and it's perfect. Small with an adjustable temperature, plus a little light turns on when it is heating. It's fully submersible and if you aren't sure if it will heat to the correct temperature, take 5 seconds and research how to calibrate aquarium heaters. Calibration takes about 10min, you basically stick it in the water unplugged for a short time and then you turn it on. That way you can make sure it's sensing the initial temperature correctly. The only reason I gave it four stars is because I wish the dial was numbered, but everything from ordering to shipping to usage has been perfect. Make sure you also have a thermometer in the tank, they're like $2 and will save you from ever worrying if your tank is too hot or cold. If you are debating whether to get this or a non adjustable heater, GO WITH ADJUSTABLE.
2 Comments 14 of 14 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Size: 25-watt Verified Purchase
I have a 2.5 gallon betta tank, and this heater works perfectly for it. It's small enough to fit easily into a corner, upright (so I can easily reach the control knob). I had bought another small-tank heater first, but it was too large and I had to put it diagonally across the back of the tank, which I hated - it completely obscured the background and was just so obvious. I like to try to keep my aquarium equipment as unobtrusive as possible, though admittedly that's tricky in tiny tanks. This heater is the small enough to pull it off as well as can be expected.

I am able to keep the tank a consistent temperature (around 80 degrees). I do not have to have it up all the way to get that temp, so it has a good temperature range. I am thinking about setting up a few more betta tanks, and will definitely get more of these heaters if I do.
Comment 11 of 11 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Size: 50-watt Verified Purchase
While I love the fact that this heater fits exactly in my Fluval Spec V, I haven't had good luck with them. The first one came with a broken holder and missing the bottom bumper, but Amazon, as always, was great about the return and replacement. The second one worked from Jan 20 until Feb 17. On the 17th I pulled it up to raise the heat setting and noticed the tube was full of water. I am very glad I found this out before it shorted out and killed my fish and I'm very glad I got it out without electrocuting myself or bystanders. After I had unplugged it and removed it from the tank it became clear that the water was seeping in at the seal (where the glass meets the controller on the top). I've seen a couple of posts on the tank forums about folks having this issue, and an ensuing debate about how "submersible" they mean when they call it a "submersible" heater. To be clear, mine wasn't horizontal on the tank or anything, and the top sticks out of the water about 1/2 inch most of the time. Anyway, if you're thinking this heater can run underwater (like I was), beware.
Comment 7 of 7 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Size: 25-watt Verified Purchase
I needed a shorter heater to fit in my five gallon tank and I didn't want a preset one. This mini 25-watt fit the bill. My only complaint would be that it has not number setting. You just have to turn it up or down a little at a time and wait for the temperature to adjust to the new setting, which can take about 24 hours. Then, if it isn't right, you make another adjustment and wait. Other that that, it works fine.
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Size: 25-watt Verified Purchase
I purchased this for my 2 gallon Betta Fish Tank. While I love the fact that it is only 6 in long, I am extremely frustrated that the product did not come with better information. For example, they list a "minimum water line" but say nothing about the heater not being fully submersible, despite the title "submersible heater". The packaging should have clearly indicated that you should NOT submerse the heater above the "minimum water line" which would actually make it the "maximum water line". I had to remove some of the water in order to fit it in the tank and still keep the water at the "minimum water line".

I am also frustrated because there is nothing on the packaging that would indicate what temperature the heater is factory set to. It simply says that the heater was calibrated in a 70 degree room, and there are NO markings on the heater itself that would indicate the temperature. It needs a temperature gauge on the side that is clearly marked so that a person can verify that they are not over heating a tank. I stuck it in my tank and am closely monitoring the water temperature for the moment. However, I will be returning it if I can't get the temperature to hold steady.

Lastly, the package showed up extremely dirty (even in the box that Amazon put it in).
6 Comments 13 of 17 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Marina Submersible Heater for Aquarium, Mini, 25-watt
This item: Marina Submersible Heater for Aquarium, Mini, 25-watt
Price: $14.99
Ships from and sold by Amazon.com
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