Editor's Choice - Our Favorite CNZ Aquarium Heaters

1. CNZ EH-300W 300W Aquarium Glass Submersible Heater, 2-Pack

User Ratings: 63 7

CNZ First Impressions

"I have a betta in a 1."

The temperature gauge is fairly accurate in my 55 gallon tank. Am a totally sold customer and would recommend them to anybody! The setting always stayed the same. --The heater itself is a bit shorter if your tank is a short one. This product came in the nick of time! Easy to read the temp and know exactly how warm the water is. Ick for instance detaches from fish at 86 degrees and dies at 89.

  • CNZ EH-300W 300W Aquarium Glass Submersible Heater, 2-Pack
  • Fully submersible glass heater for reliable aquarium performance
  • Set desired aquarium temperature & on/off indicator light confirms operation
  • Fast heating and accurate heating temperature range is 68-93F (20-34C)
  • On/off indicator light allows simple, visual confirmation of heater operation
  • Wattage: 300-watt; Heater Length:14"; Tank Capacity: 75gal; Voltage: 110-120v 60Hz
  • Manufacture: CNZ
  • Editor's Impressions Of The CNZ
  • Heat Quality [star rating='5']
  • Quality [star rating='3.4']
  • Value For Money [star rating='4.3']
  • Affordability [star rating='3.7']

CNZ Final Thoughts

"No issues."

It does blend well in some setups and may look bulky in others. But my guys don't read them and don't listen! I have only had minor problems with the suction cups. I contacted the manufacturer and they sent me a new unit in less than a week! I got this heater for my 55 gallon aquarium. This this is amazing and is worth the money. I have a few of these and I use them in my 55 gallons tanks and a 29 gallon tank.

Overall Score
4.2

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

2. PERSUPER Aquarium Heater, 100W/200W Submersible Heater Fish Tank 10-40 Gallon Heater for Betta Turtl...

User Ratings: 68

PERSUPER First Impressions

"Works fine."

I like how the heater is constructed. --The cylinder or rod diameter is bigger. My heater is fully submerged underwater and works perfectly fine. Once I opened the box i noticed the quality of the construction. I love the heater otherwise, but I'm afraid some water has gotten inside the heater. Would be great to be able to tune that to. It's only been set up for a month we'll see how well it does in a few months.

  • PERSUPER Aquarium Heater, 100W/200W Submersible Heater Fish Tank 10-40 Gallon Heater for Betta Turtle Adjust Thermostat Water Heater 68 to 94°F Fast Heating Temperature Controller with LED Display
  • Accurate Temperature Control: the intelligent IC chip is used for the aquarium heater. Press and hold the temperature control button for 3 seconds, switch between Fahrenheit and Celsius to control the temperature between 68 ° f / 20 ° C and 94 ° f / 34 ° C; this heater provides the best living environment for aquatic organisms.
  • Safety Assurance: it adopts the highest waterproof grade IP68, explosion-proof, and anti-corrosion. When heating, it is more resistant to damage than the traditional glass heater and has the function of overheating and water shortage protection. External temperature controller: touch the button controller to adjust the temperature without wetting your hands.
  • Constant Temperature Function: when the water temperature reaches the specified temperature, the smart system will automatically stop heating, when the water temperature is lower than the set temperature, it will automatically start heating.
  • Easy to Use: submersible heaters are suitable for all types of aquariums; they are installed vertically or horizontally to ensure that the equipment is completely submerged. The heating rod shall be completely immersed in water and cannot be heated without water. Please unplug the power supply when cleaning the fish tank or replacing the water in the fish tank.
  • Wide Compatibility: aquarium heater with CE, FCC, and ROHS certification, plug with UL certification; suitable for fresh water and marine aquarium, aquaculture, glass containers, and aquaculture system. 12 months warranty, 24-hour professional after-sales service.
  • Manufacture: PERSUPER
  • Editor's Impressions Of The PERSUPER
  • Heat Quality [star rating='4.3']
  • Quality [star rating='3.9']
  • Value For Money [star rating='4.1']
  • Affordability [star rating='4']

PERSUPER Final Thoughts

"Impressive."

Am a totally sold customer and would recommend them to anybody! I got a hold of Amazon, who put me in touch with the seller. Seems to keep the temp n the tank fairly regular. It comes with a hanging kit and can be secured on the edge of the tank. We received the chiller promptly and put it into use. It would stick out of my 30 g wide tank if I were to put it vertical. The design is sleek and modern looking.

Overall Score
4.4

[star rating="4.4"]
(8 Points)

3. n a Aquarium Heater,25W 50W Aquarium Fish Tank Submersible Heater,Anti-Scald Fish, with Water Shorta...

User Ratings: 60 8

N / A First Impressions

"I setup a 5."

Those turned out to be a hit and miss. I went ahead and went with the the larger 300W for my 45 gallon. Seems to keep the temp n the tank fairly regular. Product was received fast, works excellent! Ick for instance detaches from fish at 86 degrees and dies at 89. The heater is easy; turn the dial to set temp and plug in. I had a thermometer on opposite side of tank and the heater was dead on true.

  • n a Aquarium Heater,25W 50W Aquarium Fish Tank Submersible Heater,Anti-Scald Fish, with Water Shortage Protection and Aquarium Thermometer, for 3 to 25 Gallon Fish Tank Water Tank
  • [Automatic temperature control chip]: Aquarium Heater can automatically adjust the temperature between 77 ° F and 82 ° F (25 ° C to 28 ° C). It is different from the traditional manual adjustment of other aquarium heaters, without setting. It will automatically turn on / off to reach the set temperature continuously and steadily.
  • [Gift temperature sticker]: Paste the temperature sticker to the surface of the water tank, and you can use it to monitor the temperature.
  • [Stable and high-grade materials]: strong industrial plastics, non-toxic and durable. It has explosion-proof, anti-expansion functions, high temperature resistance and safety. Suitable for betta fish, such as turtles and lace. Length-13.97 cm, width-2.29 cm, thickness-1.68 cm.
  • [What capacity is suitable]: 25W fish tank heater is suitable for 9.83 liters to 1.83 liters, and can be used for mini fish tanks and aquariums. This aquarium heater is equipped with a suction cup, which can be easily absorbed in the aquarium. Easy to hide in the water tank.
  • [Warranty and quality assurance]: We provide 24-hour guidance service, you can contact us at any time, and one year of quality problems return service. This product aquarium heater has passed CE, ROHS, FCC certification. Explosion-proof, waterproof, anti-expansion, high temperature and other safe operations.
  • Manufacture: n a
  • Product Dimensions: 5.3 x 1 x 0.7 inches; 6.14 Ounces
  • Editor's Impressions Of The N / A
  • Heat Quality [star rating='3.7']
  • Quality [star rating='3.8']
  • Value For Money [star rating='3.1']
  • Affordability [star rating='4.5']

N / A Final Thoughts

"Overall happy."

The heater is super thin and the reflective surface is interesting. The temperature lights up so it's very easy to read. I think it works well to not stand out like other heaters. The temperature difference was very minor. Awesome chiller, perfect for Hydroponics. This is a great heater that is very easy to set up and program. Easy to read the temp and know exactly how warm the water is.

Overall Score
4.1

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

4. HITOP Adjustable Submersible Aquarium Heater, 50W 100W 120W Fish Tank Heater for 5-35 Gallon (50W fo...

User Ratings: 68 7

HITOP First Impressions

"Until the next time."

Come on Fluval, expect better from you. We wish the controls were available in Farenheit also to make things a little easier. Easy to read the temp and know exactly how warm the water is. There is no protection from it banging on the glass tank. I was worried about the quality but I am thoroughly impressed with this heater! The temperature has been holding all day, even in a colder room. This is a powerful heater that holds temperature very well.

  • HITOP Adjustable Submersible Aquarium Heater, 50W 100W 120W Fish Tank Heater for 5-35 Gallon (50W for 5-10 Gallon)
  • [Size]: 100W aquarium heater with cover Height:9.5in/diameter:1.5in. Situable for fish tank 10-35gallon(fresh water and seawater).
  • [Safety design]: This is a glass aquarium heater with a strong protective cover, which can effectively prevent fish or turtles from hitting and touching. Note that this protective cover cannot be removed.
  • [Steady Temperature-control]: After the temperature is set, this fish heater will automatically turn on and off to maintain the water temperature at the set temperature.
  • [Easy to use and adjustable]Adjustable fish tank heater from 68°F to 93°F , The best temperature range for most fishes is 76°F-80°F.
  • [Attention]:Because of the protective cover, the volume will be larger than the conventional glass heater, but the protective cover is tri-prism shape, which can save some space.
  • Manufacture: Haisen
  • Editor's Impressions Of The HITOP
  • Heat Quality [star rating='3.4']
  • Quality [star rating='3.8']
  • Value For Money [star rating='3.8']
  • Affordability [star rating='3.8']

HITOP Final Thoughts

"No worries, though."

The bonus digital thermometer it came with has been super helpful, and is accurate. You program it for temperature you want your tank to be. Well I bought a second one took me only one trying to get the right temperature. Sometimes you may have to tinker around with the dial. The heater protector was very heavy plastic and slim lined which is great. So if you set it to 78 degrees, the heater will not kick on until it reads 76. I left seller feedback yesterday but have yet to hear from the seller.

Overall Score
4.3

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

5. SALUTE Aquarium Heater Submersible Auto Thermostat Heater, (50W/100W/200W/300W) Fish Tank Heater and...

User Ratings: 72 4

SALUTE First Impressions

"Very pleased so far."

This product came in the nick of time! I left seller feedback yesterday but have yet to hear from the seller. We received the chiller promptly and put it into use. Also were nice along the whole process. They shipped us the upgraded version that also heats! The line is there due to regulations in certain countries. Sometimes it gets outside of it's ability to cool but only within a few degrees.

  • SALUTE Aquarium Heater Submersible Auto Thermostat Heater, (50W/100W/200W/300W) Fish Tank Heater and Adjustable Temperature with 2 Suction Cups Suitable for 10-115 Gallon Fish Tank
  • Accurate Temperature Control: Power: 300W. Suggested water volume: 75-115gal. The aquarium heater temperature can be adjusted automatically. It is very easy to adjust the temperature you need, Adjustable heater from 68°F to 93°F (20°C - 34°C). A good temperature range for most fishes is 76°F to 80°F (25- 27°C).
  • Suction Cup Fixing: Fish tank heater also equipped with 2 suction cups . The aquarium heater can be fixed at any position on the cylinder wall. The product's suction cups use thicker, non-aging materials, which greatly extend the life.
  • Safe to Use: Double waterproof protection, complete underwater design can accurately maintain the temperature. Aquarium heater with two individual suction units available for safety. Polarity prevention and the power conversion is safe and reliable. Easy operation and high temperature resistance, explosion-proof quartz glass tube, high safety!
  • High Quality: Excellent heat resistance, good thermostat Heater insulation, high heat transfer efficiency, strong support hooks and suction cups, the product is more stable and reliable.
  • 100% Money Back Guarantee: We are so confident you'll think we have the best submersible heater on the market. If you have any problems with aquarium heater, please feel free to contact us by email. We will offer a free replacement or full refund.
  • Manufacture: SALUTE
  • Editor's Impressions Of The SALUTE
  • Heat Quality [star rating='3.5']
  • Quality [star rating='4.2']
  • Value For Money [star rating='3.7']
  • Affordability [star rating='3.8']

SALUTE Final Thoughts

"So far so good."

This is a great heater that is very easy to set up and program. If the water runs low or air gets in the heater shuts off. This heater warmed it right up and now my Betta and guppies are more active. I dont know, and havent tried just yet. I'm not a big fan of the big glass tubes. And I get to keep the first one I bought! I got this heater for my 55 gallon aquarium.

Overall Score
4.5

[star rating="4.5"]
(347 Points)

6. U-picks Submersible Aquarium Heater 100W/300W/500W Fish Tank Heater with Intelligent External LED Di...

User Ratings: 70 11

U-picks First Impressions

"It easy to set."

We received the chiller promptly and put it into use. It's only been set up for a month we'll see how well it does in a few months. The controller is easy to use, very accurate and reliable. Once I opened the box i noticed the quality of the construction. Personally for me the housing doesn't bother me. If the water runs low or air gets in the heater shuts off. They shipped us the upgraded version that also heats!

  • U-picks Submersible Aquarium Heater 100W/300W/500W Fish Tank Heater with Intelligent External LED Digital Temperature Controller and Dual Temp Displays for Turtle Betta Fish Tank 5-130 Gallon
  • External Controller: Our fish tank heater is adjusted by an external controller, which you can mount on the outside edge of the tank. It’s convenient and safe to adjust temperature, no need to take the heater out from water and risk burning yourself.
  • Dual Temp Displays: With dual accurate LED digital temp displays, you can read & set the water temp at the same time. It is very easy and convenient for you to recognize and observe the temp change in real time even in the night!
  • Smart Heating: With the built-in temperature sensor and constant temperature heating system, this fish heater will start to work when the water temp is lower than set temp(red indicator), and stop work until the water temp reaches set temp(blue indicator). It can always provide adequate and steady water temperature for your beloved fish.
  • High Quality: Our fish tank heater is made of thicker quartz, which is shatter-proof and blast-proof. The heater cover is compact designed, which is heat resistant that will protect you little fish from scalding.
  • Tank Size: This 100W aquarium heater is suitable for 5-25 gallon fish tank both freshwater and saltwater. With our this fish tank heater, you can create a comfortable and safe environment for your fish.
  • Manufacture: U-picks
  • Editor's Impressions Of The U-picks
  • Heat Quality [star rating='3.3']
  • Quality [star rating='5']
  • Value For Money [star rating='4.7']
  • Affordability [star rating='3.3']

U-picks Final Thoughts

"Yes, you read that right."

I was worried about the quality but I am thoroughly impressed with this heater! I adjusted the set temperature a little lower to be more in the range I wanted. My fish likes to get close to it and he has never been hurt by it. Keeps the water consistent and it's easy to adjust! You program it for temperature you want your tank to be. My marina heater takes a few hours. Come on Fluval, expect better from you.

Overall Score
4.3

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

7. AQQA Submersible Aquarium Heater,100W/200W/300W/500W/800W Fish Tank Heater,External Temperature Cont...

User Ratings: 89 3

AQQA First Impressions

"Great product."

I have a 10gallon tank that was at 72 degrees. I like the fact that it comes with a digital thermometer. I am very happy with this purchase. Bought it as a chiller for the k40 CO2 laser. It's pretty noticeable, but I don't really care. The setting always stayed the same. Pressing and holding the button for 5 seconds changes it from F to C readouts.

  • AQQA Submersible Aquarium Heater,100W/200W/300W/500W/800W Fish Tank Heater,External Temperature Controller LED Temperature Display with 2 Suction Cups Suitable for Marine Saltwater and Freshwater
  • 【Explosion-proof Quartz Glass Aquarium Heater Durable and Safer】The heater made of explosion-proof quartz glass material and a high-temperature resistant nickel-chromium heating wire with silicon carbide heat conduction,faster water heating and long lasting.2 hours heating 1℃.The shell is a high temperature resistant PC material, which can effectively protect the fish from scalding.
  • 【Temperatures Ranges 59℉ to 93℉,Automatic Heating】The heating rod built-in thermometer,When the water temperature is lower than the set temperature by 1℉, the heater will automatically heat up, and stop heating when the water temperature is consistent with the set temperature.Fahrenheit and Celsius can be converted to each other,Pressing and holding for 5 seconds changes temperature display from Celsius to Fahrenheit.
  • 【LED External Controller with Indicator Light】The controller is not waterproof, please keep away from water,LED digital display screen shows the current water temperature and preset temperature.The number above the controller is the current water temperature, and the number below is the set temperature,Red light means heating,Blue lights indicate constant temperature,blue light flashing indicates the heater not fully submersibled.
  • 【Memory Function,Dry Burning-resistant Protection】Controller with memory function,If power is shut off,the heater will keep the temperature settings until it powers on again,no need to worry about pets when you going out.When the heating rod is 5cm above the water surface, the heating rod will automatically power off, and the controller will display "E1". When submerged in the water again, the heater will automatically return to normal, no need to unplug the power or reset the controller.
  • 【Controller Can Be Installed with Adjustable Hooks】A hook can be installed on the back of the controller to hang on the fish tank. The installation is very simple and no tools are needed.The size of the hook can be adjusted according to the thickness of the fish tank,Very safe and reliable.AQQA products enjoy a one-year warranty, please rest assured to buy.
  • Manufacture: AQQA
  • Editor's Impressions Of The AQQA
  • Heat Quality [star rating='4']
  • Quality [star rating='4.7']
  • Value For Money [star rating='3.9']
  • Affordability [star rating='5']

AQQA Final Thoughts

"Amazing customer service."

Keeps the temperature within 1 degree of what you set it to at all times. You don't have to worry about wide temperature swings with this unit. Once I opened the box i noticed the quality of the construction. I got this heater for my 55 gallon aquarium. We would consider a replacement and then we would return the defective unit. This has the best controller that I have found on the market. The heater is easy; turn the dial to set temp and plug in.

Overall Score
4.8

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

8. Zacro Aquarium Heater, 100W Submersible Digital Display Mini Fish Tank Heater with Intelligent LED T...

User Ratings: 67 6

Zacro First Impressions

"That was cool."

I confirm it with my cooking digital probe thermometer. The suction cups are large, high quality and seem to stick great. I went ahead and went with the the larger 300W for my 45 gallon. We received the chiller promptly and put it into use. I have a few of these and I use them in my 55 gallons tanks and a 29 gallon tank. I use this little heater for my 10 gallon quarantine tank. I will definitely be buying another one for my other tanks at bigger one.

  • Zacro Aquarium Heater, 100W Submersible Digital Display Mini Fish Tank Heater with Intelligent LED Temperature Display and External Temperature Controller, for 10-20gal Fish Tank
  • INTELLIGENT TEMPERATURE CONTROL: An intelligent IC chip controls the heater temperature, making the temperature difference within ±2ºF. 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. Provide the best living environment for your aquatic creatures.
  • DIGITAL DISPLAY&REMOTE CONTROLLER: Digital LED display shows real time water temperature. Heating temperature range from 68 to 91°F. The remote-button controller adjusts the temperature without getting your hands wet.
  • AUTOMATIC OVERHEATING PROTECTION: Once set the desired temperature, this fully submersible heater lights on red indicates that it is heating. It will auto shut off once it reach set temperature. If the heating rod temperature reaches 96.8°F (36°C), the heating rod will stop heating. The thermometer can observe the water temperature at any time.
  • SHUT OFF WHEN OUT OF WATER: Please note that this a fully submersible aquarium heater for fresh water and saltwater tank, when the top part of the heater is out of water it will auto shut off and the led displaying Er. The product uses explosion-proof quartz tube and is equipped with a plastic anti-collision sheath to prevent your aquatic organisms from being injured by touching the heating rod.
  • Our heating rods can be used continuously for up to 10,000 hours and can display the use time. Let you replace the heating rod in time to ensure the continuous water temperature.
  • Keep the heater fully submerged in water.
  • Don’t bury the heater under substrates such as gravels or sands.
  • Keep the remote temp controller away form water.
  • Manufacture: Zacro
  • Editor's Impressions Of The Zacro
  • Heat Quality [star rating='3.6']
  • Quality [star rating='4.9']
  • Value For Money [star rating='3.6']
  • Affordability [star rating='3.6']

Zacro Final Thoughts

"5 gallon tank."

And I get to keep the first one I bought! Pressing and holding the button for 5 seconds changes it from F to C readouts. Awesome chiller, perfect for Hydroponics. I like to keep it at 72 and from my thermometer it is reading at exactly 72. I will definitely be buying another one for my other tanks at bigger one. I am very happy with this purchase. No biggie, but annoying nonetheless.

Overall Score
4.4

[star rating="4.4"]
(22 Points)

9. 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 [star rating='4.7']
  • Quality [star rating='5']
  • Value For Money [star rating='4.6']
  • Affordability [star rating='4.8']

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

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

10. WiFi Enabled Aquarium Monitor and Controller. Text and Email Alerts for Fish Tank Temperature, Level...

LEVEL SENSE First Impressions

"Best value."

The bonus digital thermometer it came with has been super helpful, and is accurate. Ick for instance detaches from fish at 86 degrees and dies at 89. Well worth the money the first one I bought still works great. This has been in my fish tank for a few months now and it's been absolutely perfect! This heater works, but the dial it isn't very accurate. I like the fact that it comes with a digital thermometer. The temperatures are pretty accurate.

  • WiFi Enabled Aquarium Monitor and Controller. Text and Email Alerts for Fish Tank Temperature, Level Control & Leaks
  • Wi-Fi Enabled Leak Detection, Temperature and Level Alerts. Monitor aquarium from anywhere in the world!
  • Can directly control either the aquarium heater, aquarium lights, or Automatic Top Off (ATO) Pump
  • Provides Text and Email Alerts to Unlimited Recipients
  • Monitor aquarium temperature, water level, household temperature and humidity online.
  • Built in Auto Recharging Battery provides Tripped Breaker and Power Loss Detection
  • Approved for Fresh or Saltwater Use
  • Water Leak Detection
  • Power Failure Notifications
  • Manufacture: Sump Alarm Inc.
  • Batteries: 1 Lithium Polymer batteries required. (included)
  • Editor's Impressions Of The LEVEL SENSE
  • Heat Quality [star rating='4.2']
  • Quality [star rating='4.8']
  • Value For Money [star rating='5']
  • Affordability [star rating='5']

LEVEL SENSE Final Thoughts

"Works just as advertised!"

For Discus you need warm and accurate heater and this seems to do the trick. This heater works, but the dial it isn't very accurate. Also were nice along the whole process. There is no protection from it banging on the glass tank. Two inches above that is a waterline for maximum. I wouldn't buy any other heater, unless one of these stops working. Am a totally sold customer and would recommend them to anybody!

Overall Score
5.0

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

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