Editor's Choice - Our Favorite Marina Aquarium Heaters

1. Fluval Marina Submersible Heater for Aquarium, Mini

User Ratings: 59 9

Marina 11230 First Impressions

"Best value."

We wish the controls were available in Farenheit also to make things a little easier. It would stick out of my 30 g wide tank if I were to put it vertical. There is a misconception on the internet that the heater isn't fully submersible. No biggie, but annoying nonetheless. I would definitely recommend this product. Sometimes it gets outside of it's ability to cool but only within a few degrees. It's pretty noticeable, but I don't really care.

  • Fluval Marina Submersible Heater for Aquarium, Mini
  • 25-Watt submersible heater for freshwater or saltwater aquariums
  • Easy to read temperature settings
  • Impact-resistant glass design; waterproof sealing
  • Includes bracket with suction cups for easy, secure installation
  • Bumper guard to protect fish
  • Length: 15 cm (6”)
  • Impact-resistant glass design
  • Water proof sealing
  • Manufacture: Marina
  • Product Dimensions: 1.3 x 5 x 10.5 inches; 6.4 Ounces
  • Editor's Impressions Of The Marina 11230
  • Heat Quality [star rating='4.4']
  • Quality [star rating='4.4']
  • Value For Money [star rating='3.8']
  • Affordability [star rating='4.3']

Marina 11230 Final Thoughts

"Amazing customer service."

The red light means it's off, blue light means the temperature is constant. We wish the controls were available in Farenheit also to make things a little easier. The temperature gauge is fairly accurate in my 55 gallon tank. I am very happy with this purchase. We wish the controls were available in Farenheit also to make things a little easier. --The cylinder or rod diameter is bigger. This is a great heater that is very easy to set up and program.

Overall Score
4.1

[star rating="4.1"]
(956 Points)

Peoples Choice - Other Highly Rated Marina Aquarium Heaters

2. Fluval Marina Submersible Heater for Aquarium

User Ratings: 68 7

Marina 11233 First Impressions

"The accuracy is perfect."

This product came in the nick of time! I got this heater for my 55 gallon aquarium. They promptly fixed the issue without any delays or drama. When i installed them, i let them sit in the tanks without power for 6-24 hours. I adjusted the set temperature a little lower to be more in the range I wanted. Those turned out to be a hit and miss. I think it works well to not stand out like other heaters.

  • Fluval Marina Submersible Heater for Aquarium
  • Submersible heater for fresh or saltwater aquariums or reservoirs
  • Easy to read temperature settings
  • Impact-resistant glass design; Water proof sealing
  • Includes bracket with suction cups for easy, secure installation
  • Length: 8.5 Inch
  • Manufacture: Marina
  • Product Dimensions: 1.5 x 1.5 x 8.5 inches; 9.6 Ounces
  • Editor's Impressions Of The Marina 11233
  • Heat Quality [star rating='4.8']
  • Quality [star rating='4.7']
  • Value For Money [star rating='4.5']
  • Affordability [star rating='5']

Marina 11233 Final Thoughts

"I like it."

The temperatures are pretty accurate. Product was received fast, works excellent! The temperature lights up so it's very easy to read. The temperature gauge is fairly accurate in my 55 gallon tank. The bonus digital thermometer it came with has been super helpful, and is accurate. The temperature gauge is fairly accurate in my 55 gallon tank. The temperature gauge is fairly accurate in my 55 gallon tank.

Overall Score
4.3

[star rating="4.3"]
(658 Points)

3. Uniclife Aquarium Heater Submersible with Thermometer, 200 Watt for 50 Gallon Fish Tank

User Ratings: 55 8

Uniclife First Impressions

"Just bought a second one!"

The temperature gauge is fairly accurate in my 55 gallon tank. Beware, but we are hoping for a good outcome! At this time I highly recommend this product. When i installed them, i let them sit in the tanks without power for 6-24 hours. I have 3 of the Fluval heaters, in various sizes. I got a hold of Amazon, who put me in touch with the seller. It took me only two tries to get it to the correct temperature.

  • Uniclife Aquarium Heater Submersible with Thermometer, 200 Watt for 50 Gallon Fish Tank
  • Ideal for 25-50 gallons fish tanks, can be installed in both fresh and saltwater.
  • Red rotatable knob on top for adjusting the temperatures between ranges of 68°F-93°F. Visible temperature displayed allows accurate temperature maintain.
  • Water-tight with IP68 sealing workmanship. Fix the heater tightly to the tank in vertical or horizontal with 3 strong suction cups. Shatterproof 2 mm extra thick quartz glass prevents electricity leakage and scratching. Measures 11.2" x 1" (L x D).
  • Come with Uniclife aquarium heater x 1; Suction Cups x 3; stick-on thermometer x 1(The color of number will change to blue to indicate the temperature).
  • By rotating the Red knob at the top you can simply set the temperature from 68 - 93°F.
  • The red indicator light on while heating, automatic shut-off when reach the temp.
  • The aquarium glass submersible heater must be fully immersed.
  • Install it either vertically or horizontally by attaching the suction cups to the glass of the tank.
  • Manufacture: Uniclife
  • Editor's Impressions Of The Uniclife
  • Heat Quality [star rating='4.9']
  • Quality [star rating='4.1']
  • Value For Money [star rating='3.7']
  • Affordability [star rating='4.5']

Uniclife Final Thoughts

"5 degrees."

I was worried about the quality but I am thoroughly impressed with this heater! The design is sleek and modern looking. They shipped us the upgraded version that also heats! The cover over the heating tubes is great, the turtles claws can't damage the tube. I would definitely recommend this product. My heater is fully submerged underwater and works perfectly fine. The heater is being used in a 40 gallon breeder.

Overall Score
4.2

[star rating="4.2"]
(58 Points)

4. LUYS Aquarium Heater, Upgraded 300W/500W Fish Tank Heater with Intelligent Leaving Water Automatical...

User Ratings: 87 2

LUYS First Impressions

"Very easy and accurate."

No biggie, but annoying nonetheless. This heater is NOT fully submersible. Personally for me the housing doesn't bother me. The temperatures are pretty accurate. The temperatures are pretty accurate. I am very happy with this purchase. Will update my review if any changes occur.

  • LUYS Aquarium Heater, Upgraded 300W/500W Fish Tank Heater with Intelligent Leaving Water Automatically Stop Heating and Over Temperature Protection System, Suitable for Marine Saltwater and Freshwater
  • 【Intelligent Water Sensor and Over Temperature Protection】This aquarium heater has a unique intelligent temperature and water sensor system, the heater will automatically stop heating when the heater is completely out of water or it rapidly heats beyond the set temperature, the indicator light will turn green in both cases to ensure the maximum safety of you and your aquatic organisms just like protecting our own safety.
  • 【Explosion-proof Quartz Material】The aquarium heater is made of high-quality quartz glass tube, it's very durable and explosion-proof, this fish tank heater can be used for saltwater and freshwater aquariums, which is pretty shatter-proof and blast-proof and prevents electricity leakage. And the stronger black protective container is scald-preventing for your aquatic organisms and your safety.
  • 【Rapid Heating System】The voltage of this aquarium heater is 100-120V/50-60HZ, power 300W, Universal two-pin plug, heater rod length 12.99 inch, 300W submersible heater for fish tank 26-66 gallon, Temp range: 62-93℉. The heating tube can conduct heat quickly and fully contact with water to achieve rapid heating effect.
  • 【Digital LED Display Controller】the external IC temp controller of the fish tank heater can show the water temp with 2 red LED digits. The temperature in Fahrenheit and Celsius is displayed, which can be switched by pressing and holding the button for a few seconds. To set the temp, just press the button over and over until the screen displaying the temp you desired, the setting is done and the led shows the current water temp again.
  • 【Wide Range of Use】This aquarium heater is suitable for many occasions. The fish market is a common place for us. It can maintain the freshness of fish. They are also suitable for places where aquatic life such as fish tanks, aquariums, and small fish ponds are kept. There are strong suction cups on the heater guard and the thermometer, it's easy to install the aquarium heater no to the tank walls or bottom, please keep them fully submerged.
  • Manufacture: LUYS
  • Product Dimensions: 12.99 x 1.38 x 1.77 inches; 1.57 Pounds
  • Editor's Impressions Of The LUYS
  • Heat Quality [star rating='3.9']
  • Quality [star rating='5']
  • Value For Money [star rating='4']
  • Affordability [star rating='3.8']

LUYS Final Thoughts

"Overall happy."

The temperature gauge is fairly accurate in my 55 gallon tank. If the blue light is flashing it means the heater is not fully submersible. Sometimes it gets outside of it's ability to cool but only within a few degrees. Ick for instance detaches from fish at 86 degrees and dies at 89. I hope these suction cups work very well. There is no protection from it banging on the glass tank. The heater is being used in a 40 gallon breeder.

Overall Score
4.8

[star rating="4.8"]
(87 Points)

5. PGFUNNY 25W Aquarium Heater, Fish Tank Heater for Betta Smart Thermostat, Slim Design Fit 3 to 5 Gal...

User Ratings: 69 7

PGFUNNY First Impressions

"Just bought a second one!"

This heater warmed it right up and now my Betta and guppies are more active. My heater is fully submerged underwater and works perfectly fine. Temperature is slightly off by running a little warmer. There is no protection from it banging on the glass tank. Well worth the money the first one I bought still works great. The temperature lights up so it's very easy to read. I have a 10gallon tank that was at 72 degrees.

  • PGFUNNY 25W Aquarium Heater, Fish Tank Heater for Betta Smart Thermostat, Slim Design Fit 3 to 5 Gallon Tank, with Thermometer Strips
  • 【Fully Automatic Temperature Control Chip】: Submersible Aquarium heater works in intermittent operation mode,temperature regulate between on 77℉ - 82℉, Unlike the traditional manually adjusted fish tank heaters, no need to set. and will automatically turn on/off to achieve the setting temperature constantly and stably, Energy-efficient.
  • 【Suitable for 3-5 Gallon Tank】: Fish Tank Heater 25 watt powerful and slim design fit for small fish tank. The Way of Measure Watt Heater for Your Fish Tank Needing: Watt=(Tank's Length*Wide*Water Height) /1000*2.
  • 【Advanced Materials】: sturdy engineering plastic. It has anti-explosion, anti-scalding function, high temperature resistance and high safety. Suitable for aquarium pets such as turtles and fry. Length - 5.35 inch, Width - 0.9inch, Thickness - 0.63inch.
  • 【Come with Thermometer Strips】: By using this Thermometer Strips, you will be able to monitor. An easy to identify blue color shows the current temperature of your aquarium water. Temperature Strips is for reference only. Note: The temperature strips should stick on the outside of fish box and level with the heater. due to the different materials of glass , the shown temperature may be delayed.
  • 【Quality Assurance】: This product fish tank heater have certificated by CE, ROHS, FCC certifications. Anti-explosion, Waterproof, Scald-preventing, safe operation for pet betta fish.Working power 25w, frequency: 50/60Hz, voltage: 110-120V, waterproof rating IP68.
  • Manufacture: ZENGH
  • Editor's Impressions Of The PGFUNNY
  • Heat Quality [star rating='4.1']
  • Quality [star rating='4.7']
  • Value For Money [star rating='3.5']
  • Affordability [star rating='3.9']

PGFUNNY Final Thoughts

"Works great."

This does a great job at regulating the temp in my 10 gallon. Well I bought a second one took me only one trying to get the right temperature. The heater is being used in a 40 gallon breeder. I love the heater otherwise, but I'm afraid some water has gotten inside the heater. I'm in the process of setting up for tanks. Well I bought a second one took me only one trying to get the right temperature. We would consider a replacement and then we would return the defective unit.

Overall Score
4.3

[star rating="4.3"]
(724 Points)

6. Jhua 300W Aquarium Heater Explosion-Proof Fish Tank Heater Submersible Aquarium Water Heater Adju...

User Ratings: 54 12

Jhua First Impressions

"This heater works great."

I have 3 of the Fluval heaters, in various sizes. If the water runs low or air gets in the heater shuts off. It took about an hour to reach 80f, which is fairly quick. You don't have to worry about wide temperature swings with this unit. I wouldn't buy any other heater, unless one of these stops working. So far I like it setup was super easy. Well worth the money the first one I bought still works great.

  • Jhua 300W Aquarium Heater Explosion-Proof Fish Tank Heater Submersible Aquarium Water Heater Adjustable Temperature with Protective Case & Suction Cup for 30-80 Gallon Aquarium, Fish Tank, Fish Pond
  • 【Premium Quality】Aquarium water heater made of high-purity quartz, stainless, shatter-proof and explosion-proof. Double seal design, temperature resistant material, prevent electricity leakage, safe and reliable, let your fish live happily in comfortable temperatures.
  • 【Adjustable Temperature】Setting the temperature by the button on the top of submersible water heater, you can adjust the most suitable temperature for your fish. The temperature setting range is: 16-34°C(61-93° F).
  • 【High Adsorption】 With two high adsorption suction cups, which can be firmly adsorbed on the inside of the fish tank. The aquarium heater thermostat is preferably placed at the water circulation outlet or the water inlet.
  • 【Appliction】This aquarium heater submersible is suitable for fresh or salt water aquariums, provide a warm and constant environment for your tropical fish to stay healthy. And it’s great for 30-80 gallon fish tanks, aquarium, fish pond and so on.
  • 【Attention】Please immerse the fish tank water heater completely in the water before plugging in the power. Please no take it out of the water when using it, and unplug when cleaning the fish tank or refreshing aquarium water.
  • Manufacture: Jhua
  • Editor's Impressions Of The Jhua
  • Heat Quality [star rating='3.8']
  • Quality [star rating='3.7']
  • Value For Money [star rating='4.4']
  • Affordability [star rating='3.3']

Jhua Final Thoughts

"Bought the 300W one."

Per my thermometers, they are all staying constant. I will be ordering more of these in the future. My marina heater takes a few hours. All seem to vary between 1-2 degrees of each other which doesn't concern me much. The suction cups are large, high quality and seem to stick great. Once attached to the tank wall I've had no issues with it coming off. This is only day one though, so I shall keep an eye one it.

Overall Score
3.7

[star rating="3.7"]
(34 Points)

7. FREESEA Aquarium Heater Fish Tank Submersible Heater (50W/75W/100W) with LED Temperature Display

User Ratings: 68 7

FREESEA FS28-50W First Impressions

"Until the next time."

The controller is easy to use, very accurate and reliable. I have only had minor problems with the suction cups. Personally for me the housing doesn't bother me. The setting always stayed the same. My fish likes to get close to it and he has never been hurt by it. The line is there due to regulations in certain countries. Per my thermometers, they are all staying constant.

  • FREESEA Aquarium Heater Fish Tank Submersible Heater (50W/75W/100W) with LED Temperature Display
  • ★ Temperature range: 59°F~94°F, display Fahrenheit °F, this heater is designed for1~10 gallons tank.
  • ★ Automatic constant temperature function, when water temperature reaches to specified temperature value, heater will automatically stop heating, when water temperature is lower than the set temperature, heater will automatically start heating.
  • ★ Touch button, cyclic adjust temperature , easy to use and Safety.
  • ★【Note】:this heater is 100% submersible use only, during its heating time, heater must be 100% submerged into the water.
  • ★【SATISFACTION GUARANTEED】Gain the confidence to go hard with us! Our Aquarium Heater is built with durability in mind and safety for every design, In the remote possibility that you’re not satisfied with our product, just contact us, and we will gladly give you a new Aquarium Heater replacement. 12 Month Warranty and 24 Hour Professional After-sales Service.
  • Manufacture: Guang Zhou City Freesea Industrial Co.,Ltd
  • Product Dimensions: 2.5 x 1.5 x 3.5 inches; 8.15 Ounces
  • Editor's Impressions Of The FREESEA FS28-50W
  • Heat Quality [star rating='4.7']
  • Quality [star rating='3.7']
  • Value For Money [star rating='3.7']
  • Affordability [star rating='3.3']

FREESEA FS28-50W Final Thoughts

"So far so good."

My heater is fully submerged underwater and works perfectly fine. Maintains it well except when the weather is already warm then it over heats it. I use this little heater for my 10 gallon quarantine tank. Seems to keep the temp n the tank fairly regular. You program it for temperature you want your tank to be. The cover over the heating tubes is great, the turtles claws can't damage the tube. You program it for temperature you want your tank to be.

Overall Score
4.3

[star rating="4.3"]
(2933 Points)

8. LLY Aquarium Heater Protector Detachable Heating Rod Sleeve with Suction Cups for Aquarium Fish Tank...

LLY Pet Accessories First Impressions

"6 currently."

Per my thermometers, they are all staying constant. This this is amazing and is worth the money. This heater warmed it right up and now my Betta and guppies are more active. Am a totally sold customer and would recommend them to anybody! It's pretty noticeable, but I don't really care. I will be ordering more of these in the future. I would definitely recommend this product.

  • LLY Aquarium Heater Protector Detachable Heating Rod Sleeve with Suction Cups for Aquarium Fish Tank
  • Made of high-quality materials, effectively cuts off the heat of the heater.
  • Thanks to the suction cup design, all you need to do is place it on the heating rod, attach several protective sleeves, and then suck it into the aquarium wall.
  • Protect heaters and aquarium fish, turtles, frogs, etc., protect heaters from accidental rupture, and protect fish from burns and damage.
  • High temperatures can cause scary fish to approach or pass by. The heater package protects them and makes them more comfortable in life.
  • The protective sleeve has a proper gap design to protect the fish while maintaining the effective transfer of heat generated by the heater.
  • Manufacture: LLY
  • Item Weight: 4.23 Ounces
  • Editor's Impressions Of The LLY Pet Accessories
  • Heat Quality [star rating='5']
  • Quality [star rating='5']
  • Value For Money [star rating='4.1']
  • Affordability [star rating='4.3']

LLY Pet Accessories Final Thoughts

"Just bought a second one!"

I hope these suction cups work very well. The temperature has been holding all day, even in a colder room. For Discus you need warm and accurate heater and this seems to do the trick. The bonus digital thermometer it came with has been super helpful, and is accurate. Very easy to install and the adjustable temperature gauge is pretty accurate. The controller is easy to use, very accurate and reliable. I got this heater for my 55 gallon aquarium.

Overall Score
5.0

[star rating="5"]
(1 Points)

9. hygger 200W Aquarium Heater with LED Display Controller Submersible Fish Tank Heater for 15-30 Gallo...

User Ratings: 73 9

hygger HG-925 First Impressions

"Works fine."

I went ahead and went with the the larger 300W for my 45 gallon. It comes with a hanging kit and can be secured on the edge of the tank. I got a hold of Amazon, who put me in touch with the seller. Very easy to install and the adjustable temperature gauge is pretty accurate. Two inches above that is a waterline for maximum. This is a great heater that is very easy to set up and program. The temperature difference was very minor.

  • hygger 200W Aquarium Heater with LED Display Controller Submersible Fish Tank Heater for 15-30 Gallon
  • This fully submersible aquarium heater enables memory function and over heat protection. Auto shut off when over-heats, resets when it cools down
  • Made with premium quartz and double sealed by black protective guard, this fish tank heater is resistant to corrosion, and protect fish and other livestocks from punching and scalding
  • Build-in external IC temp controller, easy to read blue LED digital number shows real time water temperature. Heat indicator lights on red when fish heater start to heat and turns in yellow once it reach set temperature. Temp accuracy is +/- 1°F
  • Easy to set temperature without getting hands wet. Temperature can be precisely adjusted from 61 to 90°F (16°C ~ 32°C). Just press set button to desired temperature, it blinks 3 seconds and begins to work
  • 200 watt aquarium heater, voltage 110-120 V, heater rod 6.3 inches long, suitable for tank capacity 15-30 gallon freshwater and saltwater aquariums
  • IP68 100% Waterproof, Fully Submersible
  • Dual Protection - Durable Quartz Tube, resistant to corrosion; Double sealed material and protective container for scald preventing and anti punching Accurate temperature control from 61°F to 90°F (16°C ~ 32°C)
  • Easy to read blue LED digital display shows water temperature
  • Manufacture: hygger
  • Editor's Impressions Of The hygger HG-925
  • Heat Quality [star rating='3.9']
  • Quality [star rating='5']
  • Value For Money [star rating='4']
  • Affordability [star rating='3.8']

hygger HG-925 Final Thoughts

"Overall happy."

At this time I highly recommend this product. I wouldn't buy any other heater, unless one of these stops working. The controller is easy to use, very accurate and reliable. Personally for me the housing doesn't bother me. So if you set it to 78 degrees, the heater will not kick on until it reads 76. --Temperature adjustment labeling is on top rather than on the rod. The heater is being used in a 40 gallon breeder.

Overall Score
4.3

[star rating="4.3"]
(31 Points)

10. Aqueon Submersible Heater

User Ratings: 67 11

Aqueon 100106102 First Impressions

"What a long."

Easy enough to let it run all the time. Also I like how it shows both the current temperature and the set temperature. Once I opened the box i noticed the quality of the construction. The controller is easy to use, very accurate and reliable. They promptly fixed the issue without any delays or drama. I will definitely be buying another one for my other tanks at bigger one. Those turned out to be a hit and miss.

  • Aqueon Submersible Heater
  • Precise temperature setting to 1-degree F (68-88 degrees F)
  • Recommended for aquariums up to 100-Gallons
  • Shatter-resistant construction, fully submersible
  • LED light turns on when aquarium water is being heated; Automatic safety shut off and overheat protection
  • Lifetime Limited Warranty
  • Manufacture: Central Garden & Pet
  • Product Dimensions: 3.7 x 15 x 1.5 inches; 8.96 Ounces
  • Editor's Impressions Of The Aqueon 100106102
  • Heat Quality [star rating='3.6']
  • Quality [star rating='4.9']
  • Value For Money [star rating='3.3']
  • Affordability [star rating='4']

Aqueon 100106102 Final Thoughts

"Will update in a month."

So if you set it to 78 degrees, the heater will not kick on until it reads 76. It would stick out of my 30 g wide tank if I were to put it vertical. This is a great heater that is very easy to set up and program. I am very happy with this purchase. This is only day one though, so I shall keep an eye one it. Easy to read the temp and know exactly how warm the water is. I like to keep it at 72 and from my thermometer it is reading at exactly 72.

Overall Score
4.2

[star rating="4.2"]
(1157 Points)

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