Editor's Choice - Our Favorite Sunyiny Aquarium Heaters

1. Submersible Aquarium Heater 300w 100w 200w, Anti-Explosion Fish Tank Water Heater and Thermometer wi...

User Ratings: 63 7

Sunyiny First Impressions

"Overall happy."

This is a powerful heater that holds temperature very well. The temperature difference was very minor. Or better yet, conceal it to the back corner. Product was received fast, works excellent! Checked the accuracy of the heater with an infrared thermometer. I left seller feedback yesterday but have yet to hear from the seller. The controller is easy to use, very accurate and reliable.

  • Submersible Aquarium Heater 300w 100w 200w, Anti-Explosion Fish Tank Water Heater and Thermometer with Adjustable Temperature for 20 Gallon,30 Gallon, 50 Gallon Tank,with 2 Pieces Suction Cup Suckers
  • Made of quartz glass,double seal material,high temperature resistant and explosion-proof,shatter-resistant construction, ensures safe operation and keep your fishes from scalding and punching.
  • Visible temperature setting,precise temperature setting to 1-degree F, temperature setting range: 20°~34°C(65° F - 93° F),automatic adjustment temperatures,the cord is about 2.63ft.
  • Fully submerged design,which can maintain the set temperature accurately, equipped with strong support hooks and suckers, fully submersible working on the maximum depth 3.9ft of water,mains power indicator for peace of mine.
  • With sensitive temperature regulator and over-temperature protection device, reliable and high impedance circuit heating wire heating, keep the fish tank water temperature stability, extend its service life.
  • Perfect for fresh and saltwater,submersible power: 100w, ideal for 32 gallon, provide a constant warm environment for your tropical African cichlids or other fish to stay healthy.
  • Manufacture: Sunyiny
  • Editor's Impressions Of The Sunyiny
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

Sunyiny Final Thoughts

"I'll see with these."

Well worth the money the first one I bought still works great. Maintains it well except when the weather is already warm then it over heats it. I tested it by unplugging and replugging it. I have it set to 81F to get a 77F water temp. This heater is NOT fully submersible. Sometimes you may have to tinker around with the dial. The heater is super thin and the reflective surface is interesting.

Overall Score
4.2


(284 Points)

2. 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
  • Quality
  • Value For Money
  • Affordability

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


(724 Points)

3. Uniclife Aquarium Heater Submersible with Thermometer, 50 Watt for 10 Gallon Fish Tank

User Ratings: 83

Uniclife First Impressions

"Long heater."

At this time I highly recommend this product. At this time I highly recommend this product. Per my thermometers, they are all staying constant. I waited a little bit to write the review so it could be accurate. It does blend well in some setups and may look bulky in others. If the blue light is flashing it means the heater is not fully submersible. Awesome chiller, perfect for Hydroponics.

  • Uniclife Aquarium Heater Submersible with Thermometer, 50 Watt for 10 Gallon Fish Tank
  • Uniclife submersible heater, ideal for 5-15gal 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.
  • Please notice the red indicator light is on while working, will automatically turned off when temperature reached. Carefully check external condition before use. Recommend testing before introduce to fish.
  • 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 8.6" x 1" (L x D)
  • Come with Uniclife aquarium heater x 1; Suction Cups x 3; stick-on thermometer x 1(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.
  • Manufacture: Uniclife
  • Editor's Impressions Of The Uniclife
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

Uniclife Final Thoughts

"And I am glad I did."

They shipped us the upgraded version that also heats! It took me a few days slowly turning the dial up to finally get it where I wanted. All seem to vary between 1-2 degrees of each other which doesn't concern me much. It is safe and dependable and comes with a one year warranty. The design is sleek and modern looking. I will be ordering more of these in the future. I dont know, and havent tried just yet.

Overall Score
4.8


(20 Points)

4. AQQA Aquarium Heater, 100W 200W 300W 500W 800W Quartz Glass Submersible Heater with LED Temperature ...

User Ratings: 86 5

AQQA First Impressions

"No worries, though."

The setting always stayed the same. Pressing and holding the button for 5 seconds changes it from F to C readouts. I bought a similar one at the pet store and it barely worked. But my guys don't read them and don't listen! Keeps the temperature within 1 degree of what you set it to at all times. The heater is being used in a 40 gallon breeder. And kids love pushing all sorts of buttons.

  • AQQA Aquarium Heater, 100W 200W 300W 500W 800W Quartz Glass Submersible Heater with LED Temperature Display and External Temp Controller for Freshwater and Saltwater
  • SAFE& DURABLE: Made of heat-resistant quartz glass and PC plastic cover, double seal material, providing explosion-proof, shatterproof, IP68 waterproof, much safer for human and your lovely fishes, your pets will no longer fear the winter
  • INTELLIGENT AUTOMATIC HEATING: Automatic constant temperature function, design with External Temperature Controller, Temperature Range is 59ºF- 93 ° F (15 ° C- 34 ° C), Hold button at the top of the controller down for 5 seconds, switch easily from Celsius to Fahrenheit. It will restart to heating when the water temp is 1℉(1° C ) off the set temp. If power is shut off, the heater will keep the temperature settings until it powers on again
  • Digital LED Display: LED display on the middle of the controller front side, Current Temp and Set Temp. If your heater is working properly, the red light will be constant on. When the temperature is reached 93℉(34℃), it will stop work, the blue light will be constant on. When the heater exposed to air and is not fully submerged, then display the blue light and E1 fault
  • EASY INSTALLATION: Easy and quick installation, submersible fish tank heater, vertical or horizontal placement using attached adjustable hanging rack and 2 suction cups. NOTE: Please make sure that the heater is completely submerged in the water before turning on the power, and install it near the water flowing area to prevent uneven heating
  • WIDE APPLICATION: Suitable for freshwater and saltwater aquariums. NOTE: Before you clean the aquarium or change water, please cut off the heater power, after 10 minute cooling then take out the heater. AQQA provide 12 Month Warranty and 24 Hour Professional After-sales Service. Please don't hesitate to contact us to get help
  • Manufacture: AQQA
  • Editor's Impressions Of The AQQA
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

AQQA Final Thoughts

"I like this heater."

I have had to turn the dial to about 78-79 for the tank to stay around 76 degrees. Per my thermometers, they are all staying constant. I'm not a big fan of the big glass tubes. I got the 200W variant for my 54 gallon corner tank that's housing goldfish. I have had to turn the dial to about 78-79 for the tank to stay around 76 degrees. Come on Fluval, expect better from you. But my guys don't read them and don't listen!

Overall Score
4.7


(55 Points)

5. Aqua Euro USA Apex Chiller Horsepower: 1/10 HP

Aqua Euro USA AC10A First Impressions

"Can be hidden."

Sometimes you may have to tinker around with the dial. There is a misconception on the internet that the heater isn't fully submersible. I got the 200W variant for my 54 gallon corner tank that's housing goldfish. Or better yet, conceal it to the back corner. This this is amazing and is worth the money. I contacted the manufacturer and they sent me a new unit in less than a week! Or better yet, conceal it to the back corner.

  • Aqua Euro USA Apex Chiller Horsepower: 1/10 HP
  • Titanium heat exchanger features a high BTU rating for superior heat removal
  • Aquarium water chiller designed with quiet operation-rubber mounts to reduce vibration
  • Powerful compressor uses Freon-free and ozone-friendly R134a refrigerant
  • 1/10th Horsepower Rating
  • Manufacture: Aqua Euro USA
  • Item Weight: 29 pounds
  • Product Dimensions: 15.7 x 8.6 x 16.4 inches
  • Editor's Impressions Of The Aqua Euro USA AC10A
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

Aqua Euro USA AC10A Final Thoughts

"5 or even."

All seem to vary between 1-2 degrees of each other which doesn't concern me much. The bonus digital thermometer it came with has been super helpful, and is accurate. For Discus you need warm and accurate heater and this seems to do the trick. There is a misconception on the internet that the heater isn't fully submersible. If the water runs low or air gets in the heater shuts off. And kids love pushing all sorts of buttons. Personally for me the housing doesn't bother me.

Overall Score
3.7


(2 Points)

6. Eheim Thermocontrol e250 Heater, Black (AEH3638090)

Eheim AEH3638090 First Impressions

"It is a bit pricey."

I contacted the manufacturer and they sent me a new unit in less than a week! Ick for instance detaches from fish at 86 degrees and dies at 89. At this time I highly recommend this product. Those turned out to be a hit and miss. This heater is NOT fully submersible. Ick for instance detaches from fish at 86 degrees and dies at 89. The design is sleek and modern looking.

  • Eheim Thermocontrol e250 Heater, Black (AEH3638090)
  • Advantages of the EHEIM control heater thermocontrol-e Precise temperature adjustment from 68°F to 89°F (20 to 32°C) No readjustment necessary Control accuracy 0. 5 °C The heat is kept constant Control lamp indicates the heating function (red: heating up; green: temperature reached) Fully submersible (waterproof) With dry-running protection (Thermo Safety Control) Glass coating increases the heating surface and ensures optimum, even heat output Including double suction holder Many sizes for aquariums from 5 to 300 gallons Suitable for fresh and marine water Highest safety and reliability Made in Germany Specifications Wattage: 250W Temperature setting range: 68°F to 89°F (20 to 32°C) Aquarium Size (approx. ) 106-159 Gallons Height: 17. 4" Power Cord Length: 5. 5'
  • Item Package Height: 3.0
  • Item Package Length: 25.0
  • Item Package Width: 3.0
  • Manufacture: Eheim
  • Editor's Impressions Of The Eheim AEH3638090
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

Eheim AEH3638090 Final Thoughts

"Perfect heater for my 2."

It took me a few days slowly turning the dial up to finally get it where I wanted. I like how the heater is constructed. The bonus digital thermometer it came with has been super helpful, and is accurate. The heater protector was very heavy plastic and slim lined which is great. This has the best controller that I have found on the market. You don't have to worry about wide temperature swings with this unit. This is only day one though, so I shall keep an eye one it.

Overall Score
5.0


(2 Points)

7. Hitop 50W 100W 300W Submersible Adjustable Aquarium Heater, for 5 – 50 Gallon Fish Tank

User Ratings: 75 4

HITOP-Fish First Impressions

"5 degrees."

It took me only two tries to get it to the correct temperature. I will definitely be buying another one for my other tanks at bigger one. It's pretty noticeable, but I don't really care. And I get to keep the first one I bought! They promptly fixed the issue without any delays or drama. Also I like how it shows both the current temperature and the set temperature. I have had to turn the dial to about 78-79 for the tank to stay around 76 degrees.

  • Hitop 50W 100W 300W Submersible Adjustable Aquarium Heater, for 5 – 50 Gallon Fish Tank
  • Explosion Proof: 2mm thickened explosion proof glass, 33% thicker than the normal, safer for both human and animals.
  • Application: 50W water heater is suitable for 5 – 20 gallon tank, also suitable for both saltwater and freshwater.
  • Accurate Temperature: Temperatures from 68°F to 93°F (20°C - 34°C), come with a thermometer sticker, convenient to detect the water temperature without another pay.
  • Long Service Life: Adopt 8-slot multi-branched heating wire ceramic frame, shorter length, 7.8*1*1 in(20*2.5*2.5 cm), better heat dissipation, and can save more space for your fishes.
  • Complete Accessories and Warranty: Except for thermometer, also equipped with 3 suction cups, one for replacement, and offer 12 months warranty, leave you no worries after you buy it.
  • Manufacture: IBAY
  • Product Dimensions: 7.8 x 1 x 1 inches; 8.78 Ounces
  • Editor's Impressions Of The HITOP-Fish
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

HITOP-Fish Final Thoughts

"The FreeSea is amazing."

Keeps the water consistent and it's easy to adjust! But my guys don't read them and don't listen! What more could you ask for great job Hygger Duncan. This heater warmed it right up and now my Betta and guppies are more active. I got this heater for my 55 gallon aquarium. This heater warmed it right up and now my Betta and guppies are more active. At this time I highly recommend this product.

Overall Score
4.5


(249 Points)

8. NICREW Preset Aquarium Heater, Submersible Fish Tank Heater with Electronic Thermostat, UL Listed

User Ratings: 71 6

NICREW N11941 First Impressions

"Overall happy."

I will definitely be buying another one for my other tanks at bigger one. Just be careful and keep an eye on your temp settings when you have kids over! This heater is NOT fully submersible. The controller is easy to use, very accurate and reliable. I wouldn't buy any other heater, unless one of these stops working. The suction cups are large, high quality and seem to stick great. The temperature gauge is fairly accurate in my 55 gallon tank.

  • NICREW Preset Aquarium Heater, Submersible Fish Tank Heater with Electronic Thermostat, UL Listed
  • Preset to 78°F - no adjustment required, which is the ideal temperature for most tropical fish
  • Automatic safety shut-off to avoid overheating
  • Indicator light allows simple visual confirmation of heater operation (red: heating up; off: temperature reached or unplugged)
  • Made from heat, shatter resistant quartz glass to allows for safe temperature control
  • Suitable for 3 - 10 gallon freshwater, marine and tropical aquariums
  • Manufacture: NICREW
  • Editor's Impressions Of The NICREW N11941
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

NICREW N11941 Final Thoughts

"9 degrees."

The temperatures are pretty accurate. Awesome chiller, perfect for Hydroponics. The heater is being used in a 40 gallon breeder. What more could you ask for great job Hygger Duncan. They shipped us the upgraded version that also heats! Come on Fluval, expect better from you. I like to keep it at 72 and from my thermometer it is reading at exactly 72.

Overall Score
4.4


(647 Points)

9. hygger 300W Aquarium Heater with LED Display Controller Submersible Fish Tank Heater for 30-60 Gallo...

User Ratings: 79 5

hygger HG-925 First Impressions

"Thank you for reading."

They shipped us the upgraded version that also heats! But I am single and don't have to worry about this. Ick for instance detaches from fish at 86 degrees and dies at 89. I confirm it with my cooking digital probe thermometer. This is a powerful heater that holds temperature very well. I am very happy with this purchase. Was very impressed with the quality of this heater.

  • hygger 300W Aquarium Heater with LED Display Controller Submersible Fish Tank Heater for 30-60 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
  • 300 watt aquarium heater, voltage 110-120 V, heater rod 7.7 inches long, suitable for tank capacity 30-60 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
  • Quality
  • Value For Money
  • Affordability

hygger HG-925 Final Thoughts

"Impressive."

I would definitely recommend this product. And I get to keep the first one I bought! It would stick out of my 30 g wide tank if I were to put it vertical. What more could you ask for great job Hygger Duncan. I waited a little bit to write the review so it could be accurate. Will update my review if any changes occur. I recieved this product without the instructions or the added thermometer.

Overall Score
4.6


(77 Points)

10. hygger 500W 800W Titanium Steel Aquarium Heater for Marine and Fresh Water, Digital Submersible Heat...

User Ratings: 65 13

hygger First Impressions

"5 degrees."

Keeps the water consistent and it's easy to adjust! I hope these suction cups work very well. The temperature difference was very minor. Keeps the temperature within 1 degree of what you set it to at all times. We received the chiller promptly and put it into use. Keeps the temperature within 1 degree of what you set it to at all times. Sometimes it gets outside of it's ability to cool but only within a few degrees.

  • hygger 500W 800W Titanium Steel Aquarium Heater for Marine and Fresh Water, Digital Submersible Heater with Built-in Thermometer, External LCD Display Thermostat Controller
  • 【Energy Saving Heater for Aquarium Over 60 Gal】voltage 110-120V/60HZ, power 800W, US three-pin plug, heater length 9.6 inch. The heater power cord and the controller cord are both 5ft. 800W aquarium heater for fish tank 120-180 gallon. Fast heating up aquarium heater, it takes about 2 minutes to heat 3.5 gallon water up 3℉. With 2 heating modes: MAX heating, ECO heating, more energy saving than general high power heater
  • 【Auto Shut Off When Overheating or Not Fully Submerged】with built-in thermometer and waterline detector, when the water temp is over 97F, the controller will auto shut off to prevent overheating, when the top of heating element is out of water over 0.8 inch, the controller will auto shut off and stop heating and will automatically restart heating after you place the heater fully under water
  • 【Dual Digital Displays on Controller & Heater】the digit display on the heater is to show the current water temp, the controller digit display will show the current water temp and the set temp. When you want to check the water temp, you can see that on the heater or the controller display, the digits are synchronized updated
  • 【Fully Automatic Smart Thermostat】 it's very easy to set the temp on the controller, just press the set button to choose the temp digits from 70℉ to 94℉, only integer value can be chose. The heater will stop heating when the water temp reaches the set temp, and it will restart heating when the water temp is 0.5℉ lower than the set temp. The heating mode is MAX heating when the set temp is 1℉or more higher than water temp, it will be ECO heating when water temp is 0.5-1℉ less than the set temp
  • 【Suitable for Fresh Water & Marine Water】durable black titanium steel heating element, covered by sturdy plastic guard, service life can last for 3 years or more. Can be used for fresh-water and salt-water fish tanks. The aquarium heater comes with a sturdy clip, there are 2 strong suction cups on the clip, easy to install the heater on to the fish tank wall. The fish tank heater can be placed horizontally or vertically, but must be fully submerged under water
  • Please install the heater fully under water, but don't bury it in sands.
  • Please unplug the heater and wait it to cool down for about 5-10 mins before you doing water change or moving the heater.
  • To well install the fish tank heater on to the tank wall, we suggest to slip the suction cup clip to the top 1/3 of the heater tube.
  • Manufacture: hygger
  • Editor's Impressions Of The hygger
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

hygger Final Thoughts

"Great product!"

I noticed my old hygger heater beginning to fail and my wife ordered this one. It comes with a hanging kit and can be secured on the edge of the tank. And kids love pushing all sorts of buttons. It took me a few days slowly turning the dial up to finally get it where I wanted. It comes with a hanging kit and can be secured on the edge of the tank. And I get to keep the first one I bought! I have 3 of the Fluval heaters, in various sizes.

Overall Score
4.1


(67 Points)

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