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
  • Quality
  • Value For Money
  • Affordability

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


(155 Points)

2. NICREW Submersible Mini Aquarium Heater, Aquatic Turtle Heater with Intelligent LED Temperature Disp...

User Ratings: 62 12

NICREW N12611 First Impressions

"They contacted me."

You program it for temperature you want your tank to be. We received the chiller promptly and put it into use. I hope these suction cups work very well. I used to try those other cheap heaters sold on amazon. Seems to keep the temp n the tank fairly regular. The red light means it's off, blue light means the temperature is constant. The cover over the heating tubes is great, the turtles claws can't damage the tube.

  • NICREW Submersible Mini Aquarium Heater, Aquatic Turtle Heater with Intelligent LED Temperature Display
  • Precise temperature adjustment from 68℉ to 94℉
  • Convenient and secure design will automatically shut off if heater is no longer properly submerged, preventing damage
  • LED temperature display allows easy visual confirmation of heater operation
  • External controller allows easy and safe temperature adjustment outside
  • Fully submersible heaters for aquariums up to 5G
  • Manufacture: NICREW
  • Editor's Impressions Of The NICREW N12611
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

NICREW N12611 Final Thoughts

"1 difference."

This product came in the nick of time! Those turned out to be a hit and miss. I have a 10gallon tank that was at 72 degrees. Come on Fluval, expect better from you. Well worth the money the first one I bought still works great. It is safe and dependable and comes with a one year warranty. For Discus you need warm and accurate heater and this seems to do the trick.

Overall Score
4.0


(404 Points)

3. DECJ Submersible Aquarium Heater, 25W/50W/100W/150W/200W/ Fish Tahk Heater, with Adjust Knob Thermos...

DECJ First Impressions

"Very quick shipping."

If the blue light is flashing it means the heater is not fully submersible. I bought a similar one at the pet store and it barely worked. This has the best controller that I have found on the market. They shipped us the upgraded version that also heats! I tested it by unplugging and replugging it. This is only day one though, so I shall keep an eye one it. The bonus digital thermometer it came with has been super helpful, and is accurate.

  • DECJ Submersible Aquarium Heater, 25W/50W/100W/150W/200W/ Fish Tahk Heater, with Adjust Knob Thermostat 2 Suction Cups and Free Thermometer, Suitable for Marine Saltwater and Freshwater,150watt
  • IP68 WATERPROOF: This fish tank heater is waterproof, must be fully submerged in water when working, stick it with suctions horizontally or vertically onto the tank side near the water intake or where the way of water flow. Please unplug the power supply when cleaning the fish tank or aquarium water changes.
  • LED DISPLAY: Electronic Thermostat accurate to +/- 1 ℃, no need to buy another thermometer, Clearly show the temperature you set, the red indicator light is on when it start to heat your tank, and the blue indicator is on when tank reaches the temperature you regulates.
  • OVER-HEATED & SAFTY PROTECTION: When water temperature reaches to set temperature value, heater will automatically stop heating, when water temperature is lower than the set temperature, heater will automatically start heating. When lack of water, the heater will stop working to prevent dry burning.
  • TEMP ADJUSTABLE(℃/℉ Switchable): The temperature adjustable range is from 68℉ to 94℉ (20℃-34℃), which is suitable for different aquariums,hydroponics growing system,various ornamental fish and amphibious turtles. Essential for arowana, aquarium fish, fish ponds, and turtles.
  • UNIQUE WATER CHANGER: The water filter has a built-in porous filter to prevent fish or water grass and sand from being sucked out; the water control valve can adjust the water flow size, which is conducive to cleaning relatively small sand and gravel.
  • Manufacture: Aquarium Heaters & Chillers
  • Editor's Impressions Of The DECJ
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

DECJ Final Thoughts

"Love this heater!"

My marina heater takes a few hours. They shipped us the upgraded version that also heats! And I get to keep the first one I bought! Takes a little while to drop the temps if it is hot in the garage. The heater is super thin and the reflective surface is interesting. I am very happy with this purchase. I like the fact that it comes with a digital thermometer.

Overall Score
5.0


(1 Points)

4. VIVOSUN 50W-500W Aquarium Heater Submersible Titanium Fish Tank Heaters with Intelligent LED Tempera...

User Ratings: 73 8

VIVOSUN First Impressions

"Just bought a second one!"

The heater is being used in a 40 gallon breeder. We would consider a replacement and then we would return the defective unit. I would definitely recommend this product. The temperatures are pretty accurate. I got a hold of Amazon, who put me in touch with the seller. 210 gallon ones and one 90 gallon bow front tank. After several weeks of running the heater.

  • VIVOSUN 50W-500W Aquarium Heater Submersible Titanium Fish Tank Heaters with Intelligent LED Temperature Display and External Temperature Controller
  • PRECISE TEMPERATURE CONTROL: An intelligent IC chip controls the heater temperature, making the temperature difference within ±1℃/±2ºF; Provide the best living environment for your aquatic creatures
  • SAFETY GUARANTEE: Made with IP68, the highest waterproof level; and a titanium tube material that features explosion-proof and anti-corrosion engineering, which makes this submersible heater more resistant to damage while heating better than traditional glass heaters; Built with overheat and water shortage protection
  • EXTERNAL TEMPERATURE CONTROLLER: The touch-button controller adjusts the temperature without getting your hands wet. It’s easy to control the temp from 68℉/20°C to 94℉/34°C; Check the size chart to find your desired fish tank heater
  • EASY TO SETUP: 300W submersible heater is suitable for 50 to 60 gallons aquariums; Vertical or horizontal installation and ensure the device is fully submerged underwater
  • WIDE COMPATIBILITY: The fish tank aquarium heater has CE, FCC and ROHS certification and the plug has a UL certification; Applicable for freshwater and marine aquariums, aquaculture, glass containers, and hydroponic systems
  • Press set button to start the temperature setting. The LED display will start to flash, continue pressing set button, the number in LED screen will circulate from 68 to 94 °F
  • Manufacture: VIVOSUN
  • Editor's Impressions Of The VIVOSUN
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

VIVOSUN Final Thoughts

"I bought the 7."

It is a bonus that the heater is titanium. I use a 50 for a 5 gal and a 10 gal tank. Sometimes it gets outside of it's ability to cool but only within a few degrees. I contacted the manufacturer and they sent me a new unit in less than a week! But my guys don't read them and don't listen! It took about an hour to reach 80f, which is fairly quick. I used to try those other cheap heaters sold on amazon.

Overall Score
4.4


(1173 Points)

5. FREESEA 25/50/100/200/300 Watt Aquarium Heater with Aquarium Submersible Thermometer

User Ratings: 66 8

FREESEA First Impressions

"7L Imagitarium tank."

I use a 50 for a 5 gal and a 10 gal tank. I used to try those other cheap heaters sold on amazon. I will be ordering more of these in the future. Temperature is slightly off by running a little warmer. I adjusted the set temperature a little lower to be more in the range I wanted. Easy enough to let it run all the time. It comes with a hanging kit and can be secured on the edge of the tank.

  • FREESEA 25/50/100/200/300 Watt Aquarium Heater with Aquarium Submersible Thermometer
  • ★【50 Watt Heater】: This Aquarium heater is suitable for 5 to 15 gallons aquariums, Length - 6.8 inch,voltage 110-120V, power cord is 4.0 ft, please choose the right wattage aquarium heater according to our size chart.
  • ★【Temperature range】: 63°F~95°F , It is very easy to adjust the temperature you need, we also deliberately give each customer a free diving thermometer, you can observe the water temperature of the fish tank at any time.
  • ★【Intelligent temperature control】: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. Furthermore, Automatic safety shut-off feature, and overheating protection.
  • ★【Note】: 1. Aquarium heater is 100% submersible use only, during its heating time, heater must be 100% submerged into the water.,Please unplug the power supply when cleaning the fish tank or aquarium water changes. 2. Heater rod is suitable for people over 16 years of age. Children or minors should be under adult guidance or supervision.
  • ★【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: FREESEA
  • Product Dimensions: 11.3 x 3 x 2 inches; 8.61 Ounces
  • Editor's Impressions Of The FREESEA
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

FREESEA Final Thoughts

"Highly recommended."

So when I first received it it didn't work and I was very disappointed. The temperature gauge is fairly accurate in my 55 gallon tank. I will definitely be buying another one for my other tanks at bigger one. I have it set to 81F to get a 77F water temp. I have had to turn the dial to about 78-79 for the tank to stay around 76 degrees. The heater is being used in a 40 gallon breeder. The bonus digital thermometer it came with has been super helpful, and is accurate.

Overall Score
4.3


(2536 Points)

6. Marina Betta Fish Submersible Heater for Fish Tank Aquarium, 1.5 gallons, 11182

User Ratings: 64 10

AquaClear 11182 First Impressions

"So far it seems great!"

I went ahead and went with the the larger 300W for my 45 gallon. Keeps the water consistent and it's easy to adjust! There is no protection from it banging on the glass tank. I have a few of these and I use them in my 55 gallons tanks and a 29 gallon tank. I would definitely recommend this product. This is a powerful heater that holds temperature very well. So when I first received it it didn't work and I was very disappointed.

  • Marina Betta Fish Submersible Heater for Fish Tank Aquarium, 1.5 gallons, 11182
  • 8-watt submersible fish tank heater for aquariums up to 1.5 gallons (5 L)
  • Creates ideal conditions for bettas to live in
  • Made of durable polymer, which is tougher than glass
  • Easy to install in your betta fish tank; use the suction cups to place on the side of the betta tank
  • Automatically reaches set temperature; allowing you to easily maintain your fish aquarium
  • Use in combination with the Marina Standing Thermometer (sold separately) for accurate temperature readings
  • Manufacture: Marina
  • Product Dimensions: 1.7 x 5.3 x 7.1 inches; 6.3 Ounces
  • Editor's Impressions Of The AquaClear 11182
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

AquaClear 11182 Final Thoughts

"That wasn't a good sign."

Those turned out to be a hit and miss. The heater protector was very heavy plastic and slim lined which is great. The heater is super thin and the reflective surface is interesting. The temperature lights up so it's very easy to read. You don't have to worry about wide temperature swings with this unit. Temperature is slightly off by running a little warmer. I am very happy with this purchase.

Overall Score
4.2


(2680 Points)

7. Aquarium Heater 500W/800W/1000W/1200W, Double Heating Tubes, Fast Heating and Power Saving, External...

User Ratings: 55 36

TINTOR First Impressions

"Looks as advertised."

This has been in my fish tank for a few months now and it's been absolutely perfect! Maintains it well except when the weather is already warm then it over heats it. I was worried about the quality but I am thoroughly impressed with this heater! Product was received fast, works excellent! It is safe and dependable and comes with a one year warranty. Easy enough to let it run all the time. This heater is NOT fully submersible.

  • Aquarium Heater 500W/800W/1000W/1200W, Double Heating Tubes, Fast Heating and Power Saving, External Digital Temp Controller, Used for 50-160 Gallon Fresh/Salt Water Fish Tanks
  • 【PRECISE TEMPERATURE CONTROL】The built-in PID chip realizes rapid heating, smart constant temperature, stability and precision, temperature setting range is 68~93ºF and the temperature difference is within ±1ºF. The heater provides a comfortable living environment for your aquatic creatures
  • 【SAFE AND DURABLE】Explosion-proof quartz tube, special safety design for auto shut off when overheating or not fully submerged. The heater provides a super safe living environment for your fish.
  • 【REALTIME TEMPERATURE DISPLAY】The LED digital display controller displays the real-time water temperature and set temperature, so you can keep track of the fish tank temperature at any time.
  • 【HIGH-QUALITY MATERIAL】ABS plastic integral molding, no deformation, no softening, explosion-proof and anti-corrosion, no pollution, high insulation strength, suitable for both fresh water and sea water. The double-row suction cup bracket can stably fix the heater on any corner of the fish tank
  • 【Four Size Available】500W(50-80 gal), 800W(80-105 Gal), 1000W(105-130 Gal), 1200W(130-160 Gal).
  • Manufacture: TINTOR
  • Editor's Impressions Of The TINTOR
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

TINTOR Final Thoughts

"Long heater."

I love the heater otherwise, but I'm afraid some water has gotten inside the heater. This has been in my fish tank for a few months now and it's been absolutely perfect! Now, both points are clear on the package instructions. The temperatures are pretty accurate. Come on Fluval, expect better from you. The suction cups are large, high quality and seem to stick great. Very easy to install and the adjustable temperature gauge is pretty accurate.

Overall Score
3.5


(14 Points)

8. 300w 150w 50w Submersible Aquarium Heater Auto Thermostat Heater with Suction,LED Small Mini Tempera...

User Ratings: 59 16

FTSTC First Impressions

"One word of caution."

The temperature gauge is fairly accurate in my 55 gallon tank. 210 gallon ones and one 90 gallon bow front tank. I got the 200W variant for my 54 gallon corner tank that's housing goldfish. I had a thermometer on opposite side of tank and the heater was dead on true. This is a powerful heater that holds temperature very well. Keeps the water consistent and it's easy to adjust! I confirm it with my cooking digital probe thermometer.

  • 300w 150w 50w Submersible Aquarium Heater Auto Thermostat Heater with Suction,LED Small Mini Temperature Display Aquarium Fish Tank Heater for Fish Tank Water
  • UPGRADED MORE DURABLE VERSION: Provided the best warm area to your fish in the cold winter.Keeps improving best aquarium heater for your fish tank, after collecting so many comments from customers, we upgrade its function and life time, now it works more continuously and accurately.
  • MORE SAFETY & HIGH QUALITY: This upgraded aquarium heater now updated for more durable Quartz Glass, which is pretty shatter-proof and blast-proof and prevents electricity leakage. And the stronger protective container updated for Anti-melting anti punching double sealed material, it is scald-preventing for your pets and your safety.
  • FREE THERMOMETER: This fish tank heater come with an extra thermometer to show the accurate tank temperature to avoid overheat or freeze. It provide a constant warm environment for your pet fish to stay healthy, suitable both for fresh and salt water.
  • TEMPERATURE CONTROL: Aquarium heater works in intermittent operation mode and will automatically turn on/off to achieve the setting temperature constantly and stably. Setting the temperature by the red knob on the top with range is 64°F - 94°F.High accuracy(±1°F)
  • APPLICABLE TANK SIZE: Our submersible aquarium heaters are perfect designed for different size tank, 50W for 5-10 gallon; 100W for 10-30 gallon; 300W for 30-85 gallon, please choose the suitable power for your tank. And we also recommend to position it near a strong water flow, the outlet of a power filter is ideal, so that the whole aquarium are in the same temperature.
  • Manufacture: FTSTC
  • Batteries: 1 LR44 batteries required. (included)
  • Editor's Impressions Of The FTSTC
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

FTSTC Final Thoughts

"I'll try once more."

The heater is easy; turn the dial to set temp and plug in. We wish the controls were available in Farenheit also to make things a little easier. I was worried about the quality but I am thoroughly impressed with this heater! I have a few of these and I use them in my 55 gallons tanks and a 29 gallon tank. When i installed them, i let them sit in the tanks without power for 6-24 hours. This is a great heater that is very easy to set up and program. Would be great to be able to tune that to.

Overall Score
3.9


(1234 Points)

9. ViaAqua 300-Watt Quartz Glass Submersible Heater with Built-In Thermostat

User Ratings: 73 5

ViaAqua VA 300Q First Impressions

"Highly recommended."

The temperature lights up so it's very easy to read. The heater is super thin and the reflective surface is interesting. Was very impressed with the quality of this heater. The line is there due to regulations in certain countries. They shipped us the upgraded version that also heats! I use this little heater for my 10 gallon quarantine tank. I used to try those other cheap heaters sold on amazon.

  • ViaAqua 300-Watt Quartz Glass Submersible Heater with Built-In Thermostat
  • High quality quartz glass
  • Fully-submerisble
  • Visible temperature setting
  • For use in fresh or saltwater aquariums
  • Manufacture: Commodity Axis
  • Product Dimensions: 1.13 x 1.13 x 14.8 inches; 10.88 Ounces
  • Editor's Impressions Of The ViaAqua VA 300Q
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

ViaAqua VA 300Q Final Thoughts

"Great concept."

It took about an hour to reach 80f, which is fairly quick. Those turned out to be a hit and miss. If the blue light is flashing it means the heater is not fully submersible. I got the 200W variant for my 54 gallon corner tank that's housing goldfish. I have only had minor problems with the suction cups. I have a 10gallon tank that was at 72 degrees. I think it works well to not stand out like other heaters.

Overall Score
4.5


(1104 Points)

10. Fluval M Submersible Heater

User Ratings: 80 3

Fluval A782 First Impressions

"The seller was wonderful."

I think it works well to not stand out like other heaters. If the water runs low or air gets in the heater shuts off. I have only had minor problems with the suction cups. They promptly fixed the issue without any delays or drama. This has the best controller that I have found on the market. I will be ordering more of these in the future. This is a powerful heater that holds temperature very well.

  • Fluval M Submersible Heater
  • Aquarium heater that blends into the aquarium environment with built-in reflective technology that mirrors the surrounding colors
  • Computer-calibrated thermostat and easy-to-adjust temperature control dial
  • Shock resistant Borosilicate glass and high density ceramic heat sick
  • Easy to install with slim profile tube for easy placement
  • 100-watt heater suitable for freshwater and saltwater aquariums up to 30 gallons with a 3-year warranty
  • Quality heater made in Europe using superior components and construction
  • Sleek and compact
  • Ideal for 100 L (30 US gal) aquariums
  • Manufacture: Fluval
  • Product Dimensions: 1.8 x 4.8 x 14.8 inches; 8.82 Ounces
  • Editor's Impressions Of The Fluval A782
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

Fluval A782 Final Thoughts

"5 or even."

I will be ordering more of these in the future. I will definitely be buying another one for my other tanks at bigger one. It does blend well in some setups and may look bulky in others. We would consider a replacement and then we would return the defective unit. Thanks for the great customer service! Pressing and holding the button for 5 seconds changes it from F to C readouts. My marina heater takes a few hours.

Overall Score
4.7


(1578 Points)

Copyright © 2021 Rob Aquatics — Primer Child WordPress theme by GoDaddy