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Marina C10 Compact Heater

by Marina
3.5 out of 5 stars 131 customer reviews
| 20 answered questions
List Price: $30.99
Price: $19.99 & FREE Shipping
You Save: $11.00 (35%)
Only 18 left in stock.
Estimated Delivery Date: April 27 - 29 when you choose Expedited Shipping at checkout.
10-Watt
  • Fully submersible compact heater
  • Reliable performance; Maintains set temperature of 78 degrees Fahrenheit
  • Suitable for fresh or saltwater aquariums
  • Made of durable polymer
  • Ideal for aquariums up to 2.65 gallons; 2-year warranty
4 new from $19.99 7 used from $5.29
$19.99 & FREE Shipping Only 18 left in stock. Ships from and sold by Wag.com (Quidsi Retail, an Amazon company).

Frequently Bought Together

  • Marina C10 Compact Heater, 10-Watt
  • +
  • Marina Floating Thermometer with Suction Cup
  • +
  • Zoo Med Laboratories AZMBL20 Betta Hammock
Total price: $26.97
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Size: 10-Watt

Product Details

Size: 10-Watt
  • Product Dimensions: 2 x 1 x 11 inches ; 5.9 ounces
  • Shipping Weight: 8.5 ounces (View shipping rates and policies)
  • ASIN: B003TLWWOO
  • Item model number: 11186
  • Average Customer Review: 3.5 out of 5 stars  See all reviews (131 customer reviews)
  • Amazon Best Sellers Rank: #34,001 in Pet Supplies (See Top 100 in Pet Supplies)
    • Product Warranty: For warranty information about this product, please click here

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Customer Reviews

Top Customer Reviews

3.0 out of 5 starsRecommend for 2 gallons or less
By Jester on December 31, 2013
Size: 10-Watt
Tried the C-10 on my new Fluval Spec 3 (2.6 gals). It fits perfectly in the pump compartment. Unfortunately it was unable to heat the tank above 72 degrees. It's winter and my ambient room temp is 60-65 degrees. The C-10 can't handle keeping the temp high enough because my room is cool. Instructions state:

"This heater was designed to reach and maintain the set temperature of 26ºC (78ºF), provided that the maximum difference between the ambient and set temperature is less than 5ºC (9ºF). Variables such as lower room temperature, wide temperature fluctuations, lack of an aquarium cover, presence of pumps and filters or aquarium placement in proximity to cooling sources may require a higher wattage for proper control for the given tank size."

So I bought a 25 watt heater for the tank and use the C-10 to pre-heat 1 gallon water jugs for water changes. This heater works better for 2 gallons and below. It works great heating the 1 gallon jugs. Just didn't have enough power for the 2.6 in cool climate conditions.

The Good: Simple to use, plug and play, small compact design will fit in most bowls and small aquariums.

The Bad: Fixed temp. Limited heating capacity. Wouldnt use beyond 2 gallons if your ambient room temps are below 70.
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5.0 out of 5 starsPerfect small heater for Fluval Spec Aquarium
By Cindy on March 31, 2012
Size: 10-Watt Verified Purchase
I finally moved our betta fish to a Fluval Spec Aquarium, which has a super filtration system for a 2-gallon pico and nice LED lights. Quite an upgrade from a Mason jar! I then bought this compact heater which fits very nicely in the same compartment as the pump in the Spec. It warmed up the water to a perfect 78 deg. F. and my betta is swimming more actively and looks much happier. He was probably too cold in the jar. I have no complaints about this heater--it's very compact and does the job it's supposed to. Since this is only 10 watts I wouldn't use for anything larger than the Spec tank. On our Fluval Chi tank we have a Fluval 25 watt heater, which is working very well.
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5.0 out of 5 starsGreat Compact Heater for my 6 Gallon Fluval Edge
By Jake on February 15, 2013
Size: 25-watt
I bought the Marina C25 compact heater about 2 weeks ago. I was worried about purchasing this because of the bad reviews, but I decided to go for it because it was on sale at my local fish store. This heater looks EXACTLY like the Fluval Compact Heater 25watt. The heater is thin, and not at all bulky like it is made to appear in the photo. This heats my Fluval Edge 6 Gallon perfectly! The temperature is a constant 76-78 degrees. I had to remove my thermometer just to make sure it was working (it was) because I never saw fluctuations in temperature.

The directions do say that you should submerge the heater into the tank and leave in there (unplugged) for about 10 min. I left it in for an hour before plugging it in. I was worried about fully submersing the entire thing into the water (even the part where the cord comes into the heater), but IT IS OK to do that. I had to research it on a different site to make sure I wasn't going to get electrocuted. The heater needs to be underwater at all times. This heater is awesome, and I definitely recommend this product.
2 Comments 10 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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5.0 out of 5 starsWorks well in a 3 gallon acrylic aquarium
By Elle Shopper on February 16, 2015
Size: 25-watt Verified Purchase
Reall happy with this purchase. I have a small, 3 gallon acrylic tank and had been using the under-gravel heaters in the past. I didn't like the sight of the electric cord up the back of the tank, even mostly hidden by plants - just looked shabby. The last under-gravel heater died, which I discovered when my betta became very lethargic - I hadn't checked the thermometer on the side of the tank for a while - he was cold! I purchased this heater and installed it in the back corner of the tank, next to the intake valve - looks good and blends in - neat and tidy. It's winter, and my house fluxuates between 63 at night to 67-68 during the day. The heater maintains the temp at 76, without fail. Happy with my purchase, and hope it lasts a while. Highly recommend for a small tank. Sounds like there may be some quality control issues since several folks have noted that their heater wasn't heating adequately. Call or 'live chat' with Amazon folks - they will quickly replace or refund for items that don't work like they're supposed to!
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5.0 out of 5 starsa must-have
By Claudia P. on August 30, 2013
Size: 10-Watt Verified Purchase
For tropical fish. we have one betta, and were shocked when we discovered that heneeded to be in water 10 degrres higher than our room temperature. once we installed it, he swam up against it for two days warming himself.
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5.0 out of 5 starsDoes what it says
By Chris on August 19, 2012
Size: 10-Watt
I have used this heater in 2 tanks now, 1 1.6 gallon and now its in a 2 gallon rimless shrimp tank. Keeps the water 72-78 without fail. No you can't adjust the temperature, but for 98% of freshwater fish it is the correct temp anyway. The light only comes on when its heating. No light, no Heating. It does NOT mean that its broken if the light doesn't come on. Check your tank temperature before complaining about it. I can almost guarantee you that your tank is in that sweet spot it should be.

I would definitely buy another without hesitation.
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1.0 out of 5 starsNot set at the advertised temperature. Basically useless to me...
By azzzzz on July 7, 2014
Size: 10-Watt Verified Purchase
This heater would not even turn on in my 75 degree 1.5 gallon tank. I was not sure if it was defective or not so I did a simple experiment. I placed the unit in 1L of 60 degree water with 2 thermometers to ensure accuracy. It did indeed turn on and within about 30 minutes it heated the water to 74 degrees... Then it shut off. I cooled the water back down a few degrees, and it heated it back up to 74.
Conclusion: the internal thermostat is set at 74; not the 77 degrees advertised.
74 is too cold for my fish.
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Most Recent Customer Reviews

1.0 out of 5 starsQuit working after 4 months

Quit working after roughly 4 months. I discovered our aquatic frog dead in the tank, he was healthy and fine before this heater quit working, so I am not sure if it has anything... Read more

Published 2 days ago by Patricia S.
5.0 out of 5 starshighly recommend

My betta fish Sushi (name chosen by vote) loves this heater. It heats up my 3 gal tank very nicely. Never gets so hot that Sushi can't sleep near it.

Published 6 days ago by Amazon Customer
4.0 out of 5 starsFour Stars

so far so good

Published 10 days ago by Becky
1.0 out of 5 starsTemperature inaccurate/failed twice/do not buy!

It says in the description that it is preset for 78 degrees. I have it in a 2.5 gallon breeding tank. My main tank is 78 degrees. I want my breeder tank at 78 also. Read more

Published 17 days ago by HuntandFishVA
4.0 out of 5 starsPerfect for my Marina 360

Perfect for my Marina 360. Keeps things around 72-74 and fits in the little pump chamber so it's not visible.

Published 27 days ago by Brad
5.0 out of 5 starsFive Stars

nice

Published 28 days ago by lupe
5.0 out of 5 starsFive Stars

Does a nice job in my 2.5 gallon tank. Our betta "Kojack" loves the warmer water!

Published 1 month ago by bostongal1020
1.0 out of 5 starsthe light never turned on,

the light never turned on, there was never a sign that it was on and and my beta fish died 3 days later

Published 1 month ago by naty
2.0 out of 5 starsRan at 74 degrees, not 78. Same with replacement.

Bought for rectangular 2.5 gallon Betta tank. Ran at 74 degrees instead of the advertised 78 degrees. Exchanged it. Replacement also ran at 74 degrees. Read more

Published 1 month ago by Sledge
1.0 out of 5 starsI can't get this to heat a 2.5g tank to more than 73 degrees, even...

I tried this in a 5 gallon and 2.5 gallon tank. My house is heated round the clock and the ambient temp is between 70-73. Read more

Published 1 month ago by Ms Canon

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