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. Fluval Edge 25W Compact Heater

User Ratings: 66 14

Fluval A756 First Impressions

"I got the 100 watt one."

Or better yet, conceal it to the back corner. They promptly fixed the issue without any delays or drama. I like to keep it at 72 and from my thermometer it is reading at exactly 72. It just cycles through to 93f and starts over. Come on Fluval, expect better from you. This is a powerful heater that holds temperature very well. I recieved this product without the instructions or the added thermometer.

  • Fluval Edge 25W Compact Heater
  • Provides even and efficient heat distribution
  • Ideal for use with the Fluval Edge Aquarium
  • Maintains set temperature of 78 degrees Farenheit
  • Polymer exterior prevents breakage
  • Manufacture: Fluval
  • Product Dimensions: 2 x 1 x 11 inches; 6.49 Ounces
  • Editor's Impressions Of The Fluval A756
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

Fluval A756 Final Thoughts

"Until the next time."

So when I first received it it didn't work and I was very disappointed. The heater is super thin and the reflective surface is interesting. Two inches above that is a waterline for maximum. I love the heater otherwise, but I'm afraid some water has gotten inside the heater. So when I first received it it didn't work and I was very disappointed. Per my thermometers, they are all staying constant. I will definitely be buying another one for my other tanks at bigger one.

Overall Score
4.1


(264 Points)

3. Lineba 500 Watt Submersible Aquarium Heater, Fish Aquarium Heater with LED Temperature Display for F...

User Ratings: 73 27

Lineba First Impressions

"Great concept."

Keeps the temperature within 1 degree of what you set it to at all times. I love the heater otherwise, but I'm afraid some water has gotten inside the heater. The temperature has been holding all day, even in a colder room. I think it works well to not stand out like other heaters. It is a bonus that the heater is titanium. Once I opened the box i noticed the quality of the construction. I have it set to 81F to get a 77F water temp.

  • Lineba 500 Watt Submersible Aquarium Heater, Fish Aquarium Heater with LED Temperature Display for Fish Tank
  • *Very easy and reliable to use. After well installing the aquarium heater and the thermometer, you just need to set the desired heating temp, then it can ensure the temperature constant at the set point with the blue indicator light,as it can adjust heating power automatically if there is any water temperature variation.
  • *Made of Durable Titanium alloy Tube-Our seawater resistant titanium aquarium heater is good for use both in salt water and fresh water, long service life.
  • *Antiflaming heater cover can prevent fish from going too close to the heater.
  • *Very compact small size, easy to hide in the tank. Comes with 2 suction cups to keep the heater in place of tank.
  • *There is indicator light to show the heating status on the LED screen through the temperature control. You can long-press the 'Set' key to shift degree unit between Celsius and Fahrenheit.
  • Manufacture: LINEBA
  • Product Dimensions: 5 x 2.3 x 1.3 inches; 13.76 Ounces
  • Editor's Impressions Of The Lineba
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

Lineba Final Thoughts

"Excellent build quality."

--The heater itself is a bit shorter if your tank is a short one. I got this heater for my 55 gallon aquarium. I bought a similar one at the pet store and it barely worked. After several weeks of running the heater. I have 3 of the Fluval heaters, in various sizes. I'm not a big fan of the big glass tubes. Thanks for the great customer service!

Overall Score
3.9


(8 Points)

4. NICREW Mini Submersible Aquarium Heater, Digital Temperature Display Fish Tank Heater with Adjustabl...

User Ratings: 55 17

NICREW First Impressions

"Thank you for reading."

Personally for me the housing doesn't bother me. --The heater itself is a bit shorter if your tank is a short one. Thanks for the great customer service! I got the 200W variant for my 54 gallon corner tank that's housing goldfish. There is a misconception on the internet that the heater isn't fully submersible. I tested it by unplugging and replugging it. Also I like how it shows both the current temperature and the set temperature.

  • NICREW Mini Submersible Aquarium Heater, Digital Temperature Display Fish Tank Heater with Adjustable External Controller, Suitable for Freshwater & Saltwater Tank
  • Equipped with precise temperature probe, making the temperature difference within ±2ºF to provide ideal living environment for your aquariums
  • Safe and easy to use external controller help operate without getting hands wet, allow Celsius and Fahrenheit control from 68℉/20°C to 94℉/34°C
  • Automatically shut off will be activated if heater is no longer properly submerged, preventing damage
  • Ideal for freshwater and saltwater aquariums, aquaculture, glass containers, and hydroponic systems
  • 100 watts heater is designed for 10-25 gallon fish tank
  • Manufacture: NICREW
  • Editor's Impressions Of The NICREW
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

NICREW Final Thoughts

"Works fine."

210 gallon ones and one 90 gallon bow front tank. This heater is NOT fully submersible. This is only day one though, so I shall keep an eye one it. Per my thermometers, they are all staying constant. Once I opened the box i noticed the quality of the construction. This is only day one though, so I shall keep an eye one it. This this is amazing and is worth the money.

Overall Score
4.0


(109 Points)

5. Aqua Euro USA Apex 1/2 HP Aquarium Chiller, 1030 GAL

Aqua Euro USA First Impressions

"Heats the water quickly."

There is no protection from it banging on the glass tank. Ick for instance detaches from fish at 86 degrees and dies at 89. My heater is fully submerged underwater and works perfectly fine. I have a 10gallon tank that was at 72 degrees. It is safe and dependable and comes with a one year warranty. Personally for me the housing doesn't bother me. I use a 50 for a 5 gal and a 10 gal tank.

  • Aqua Euro USA Apex 1/2 HP Aquarium Chiller, 1030 GAL
  • Designed with quiet operation-rubber mounts to reduce vibration
  • Powerful compressor uses Freon-free and ozone-friendly R134a refrigerant
  • 1/2 Horsepower Rating
  • Manufacture: Aqua Euro USA
  • Item Weight: 50 pounds
  • Product Dimensions: 18 x 12.6 x 22 inches
  • Editor's Impressions Of The Aqua Euro USA
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

Aqua Euro USA Final Thoughts

"Long heater."

I got the 200W variant for my 54 gallon corner tank that's housing goldfish. It took me only two tries to get it to the correct temperature. I use this little heater for my 10 gallon quarantine tank. It took about an hour to reach 80f, which is fairly quick. Takes a little while to drop the temps if it is hot in the garage. If the water runs low or air gets in the heater shuts off. The setting always stayed the same.

Overall Score
5.0


(1 Points)

6. Orlushy Submersible Aquarium Heater,100W/150W/200W/300W Fish Tahk Heater with Adjust Knob Thermostat...

User Ratings: 77 3

Orlushy First Impressions

"Highly recommended."

It's only been set up for a month we'll see how well it does in a few months. This does a great job at regulating the temp in my 10 gallon. Seems to keep the temp n the tank fairly regular. But my guys don't read them and don't listen! I'm not a big fan of the big glass tubes. --Temperature adjustment labeling is on top rather than on the rod. Easy enough to let it run all the time.

  • Orlushy Submersible Aquarium Heater,100W/150W/200W/300W Fish Tahk Heater with Adjust Knob Thermostat 2 Suction Cups and Free Thermometer Suitable for Marine Saltwater and Freshwater
  • ★300W aquarium heater is suitable for 50 to 80 gallons aquariums,Length - 11 inch,voltage 110-120V, power cord is 6ft, please choose the right wattage aquarium heater according to our size chart.
  • ★It shows an area to adjust the temperature. It's not exactly accurate but it turns easy and can be adjusted at small intervals.
  • ★Explosion Proof: 2mm thickened quartz glass,can be used in fresh water and salt water aquariums,easy to hide in the tank.
  • ★Precise temperature dial from 68 to 89°F allows for complete control of aquatic climate within a 1-degree difference.
  • ★Adjustable Aquarium Fish Tank Water Heater Sensitive and reliable thermostat maintains uniform temperature. Automatic shut off when the temperature is reached
  • Manufacture: Nova pet supplies co.LTD
  • Editor's Impressions Of The Orlushy
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

Orlushy Final Thoughts

"5 stars in my book!"

I was amazed how quickly I got to my temperature I need it 78 degrees. I am very happy with this purchase. The heater is easy; turn the dial to set temp and plug in. I am very happy with this purchase. My fish likes to get close to it and he has never been hurt by it. At this time I highly recommend this product. Awesome chiller, perfect for Hydroponics.

Overall Score
4.6


(2456 Points)

7. Aqueon 100101230 Flat Submersible Heater, Black,7.5W, up to 3 gallon

User Ratings: 58 11

Aqueon 100101230 First Impressions

"FIVE STARS!"

You don't have to worry about wide temperature swings with this unit. I have a 10gallon tank that was at 72 degrees. It took about an hour to reach 80f, which is fairly quick. Awesome chiller, perfect for Hydroponics. All seem to vary between 1-2 degrees of each other which doesn't concern me much. The setting always stayed the same. When i installed them, i let them sit in the tanks without power for 6-24 hours.

  • Aqueon 100101230 Flat Submersible Heater, Black,7.5W, up to 3 gallon
  • Fully submersible
  • Vertical or horizontal placement using suction cups that mount to the bottom or side wall of tank
  • Quick and easy installation
  • Shatterproof construction
  • Can be used with glass or acrylic enclosures
  • Note: Do NOT operate or leave product plugged in when it is outside of water
  • Warms aquarium water up to 6°F above ambient room temperature
  • 7.5 Watt works best for 1 to 3 gallon fish tanks
  • Manufacture: Central Garden & Pet
  • Item Weight: 6.4 ounces
  • Product Dimensions: 0.5 x 2 x 5.63 inches
  • Editor's Impressions Of The Aqueon 100101230
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

Aqueon 100101230 Final Thoughts

"5 degrees."

The temperature difference was very minor. I hope these suction cups work very well. I am very happy with this purchase. --The heater itself is a bit shorter if your tank is a short one. Seems to keep the temp n the tank fairly regular. It took me a few days slowly turning the dial up to finally get it where I wanted. We received the chiller promptly and put it into use.

Overall Score
4.1


(819 Points)

8. BoTaiDaHong 35L Aquarium Fish Tank Shrimp Water Chiller 10-40℃ Temperature Heater Cooler Set LCD D...

BoTaiDaHong First Impressions

"No issues."

Would be great to be able to tune that to. Keeps the temperature within 1 degree of what you set it to at all times. I got this heater for my 55 gallon aquarium. You don't have to worry about wide temperature swings with this unit. I adjusted the set temperature a little lower to be more in the range I wanted. I wouldn't buy any other heater, unless one of these stops working. They promptly fixed the issue without any delays or drama.

  • BoTaiDaHong 35L Aquarium Fish Tank Shrimp Water Chiller 10-40℃ Temperature Heater Cooler Set LCD Display AC 110V Adjustable Temperature Aquarium Tool 100W Fish Tank Cooling
  • 【Specification】Circulating Water Pump Flow: 1-3L/Min Suitable Range: Max.pump lift <3M Voltage: 110V Power: 100W Cooling Water Capacity: ≤ 35L Inner Size of Hose: 8mm
  • 【Save energy】The fish tank water cooler adopts micro computer and semiconductor for cooling, high efficient and low power consumption.
  • 【Application】Used with water pump and hose. Suitable for all kinds of cold water tanks.
  • 【Package included】1 X Power Adapter 1 X Power Line 2 X Hose Buckles 1 X Aquarium Water Chiller 1 X 2M Length Hose 1 X Water Pump
  • 【Shipment】We ship directly from the US warehouse.about 5-7 business days to delivery. We have a Professional Customer Service Team to Reply You within 24 hours.If you have any questions or concerns, Feel free to contact us!We will always stand behind our products and will provide the best suitable solutions for you
  • Manufacture: BoTaiDaHong
  • Editor's Impressions Of The BoTaiDaHong
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

BoTaiDaHong Final Thoughts

"Amazing customer service."

The setting always stayed the same. Awesome chiller, perfect for Hydroponics. Takes a little while to drop the temps if it is hot in the garage. It just cycles through to 93f and starts over. I hope these suction cups work very well. This this is amazing and is worth the money. We received the chiller promptly and put it into use.

Overall Score
5.0


(1 Points)

9. ISTA Micro Temperature Controller Thermostat 500W/1000W Heater Heating Aquarium Tank Globally

User Ratings: 39 29

Aquarium Equip I630_1000W ISTA First Impressions

"And I am glad I did."

My heater is fully submerged underwater and works perfectly fine. At this time I highly recommend this product. Would be great to be able to tune that to. I wouldn't buy any other heater, unless one of these stops working. I use a 50 for a 5 gal and a 10 gal tank. This is a great heater that is very easy to set up and program. The design is sleek and modern looking.

  • ISTA Micro Temperature Controller Thermostat 500W/1000W Heater Heating Aquarium Tank Globally
  • This Digital Temperature Controller is an excellent and convenient multifunction device for measuring and controlling temperature in Aquariums.
  • The stability of aquarium temperature is one of the crucial factors that contributes to the health and safety of your fish.
  • By utilizing the temperature controller, you can provide an environment with optimal temperature for your fish. This advanced temperature controller can measure and control temperature from 20 to 35 °C in Aquarium.
  • It has 3 power socket and maximum loading power is up to 1000 W. The controller set provides two Free500W Heating Rod ing Rod . The heating rod has over heating protection so it will automatic power off for heating rod when measured temperature reach 36 °C.
  • For aquarium in-door use only.
  • Manufacture: ISTA
  • Product Dimensions: 12.09 x 7.2 x 5 inches; 2.09 Pounds
  • Editor's Impressions Of The Aquarium Equip I630_1000W ISTA
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

Aquarium Equip I630_1000W ISTA Final Thoughts

"Works great."

This is a great heater that is very easy to set up and program. Beware, but we are hoping for a good outcome! Also I like how it shows both the current temperature and the set temperature. I recieved this product without the instructions or the added thermometer. Temperature is slightly off by running a little warmer. This little heater is perfect; this is our third purchase of the same heater. The line is there due to regulations in certain countries.

Overall Score
3.2


(46 Points)

10. Inkbird Temperature Controller ITC308 Reptile Freezer Thermostat Aquarium Heater Cooler 110V 1100W P...

User Ratings: 71 9

Inkbird 8541956716 First Impressions

"16-26 gallons 75 watt 10."

Keeps the temperature within 1 degree of what you set it to at all times. It's pretty noticeable, but I don't really care. I bought a similar one at the pet store and it barely worked. This is a great heater that is very easy to set up and program. And kids love pushing all sorts of buttons. 210 gallon ones and one 90 gallon bow front tank. Checked the accuracy of the heater with an infrared thermometer.

  • Inkbird Temperature Controller ITC308 Reptile Freezer Thermostat Aquarium Heater Cooler 110V 1100W Pre Wired Dual Stage Digital Outlet Probe Heating Cooling Plug Homebrewing Refrigerator Greenhouse
  • Pre-wired controller ITC-308 is served as the successor to the STC-1000. If you don't want to build your own STC-1000, the Inkbird ITC-308 is the solution!
  • Setup is easy, straightforward and quick.
  • The cord on the remote temperature sensor is a bit over 6 feet long.
  • Accurate displays, thermostatic function and temperature calibration.
  • It's an all in one, simple solution providing control of cooling and heating.
  • Item Weight: 14.4 ounces
  • Editor's Impressions Of The Inkbird 8541956716
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

Inkbird 8541956716 Final Thoughts

"Pricing was good."

This has the best controller that I have found on the market. The temperature lights up so it's very easy to read. I have a 10gallon tank that was at 72 degrees. I have a few of these and I use them in my 55 gallons tanks and a 29 gallon tank. Checked the accuracy of the heater with an infrared thermometer. Now, both points are clear on the package instructions. This little heater is perfect; this is our third purchase of the same heater.

Overall Score
4.3


(132 Points)

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