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. 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)

3. 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)

4. Hygger Mini Inline Quartz Glass Aquarium Heater with External Controller, Adjustable Submersible Bet...

User Ratings: 70 6

hygger First Impressions

"Great heater."

Keeps the water consistent and it's easy to adjust! The controller is easy to use, very accurate and reliable. I like the fact that it comes with a digital thermometer. I use this little heater for my 10 gallon quarantine tank. And kids love pushing all sorts of buttons. So far I like it setup was super easy. I have a 10gallon tank that was at 72 degrees.

  • Hygger Mini Inline Quartz Glass Aquarium Heater with External Controller, Adjustable Submersible Betta Fish Tank Thermostat 50W/100W
  • 【For Fish Tank 5-15 gallon】50W aquarium heater, voltage AC110-120V 60HZ, power cord is 4.6ft. Heater rod length is 5 inch, mini compact heater for small fish tank use. Perfect for betta tank. A very compact heater, easy to hide in the tank
  • 【Automatic Stop & Restart】Effectively maintain the tank water in the constant temp you set, stop heating when water temp reaches to the set temp and restart heating when the water temp is 1-2℉ below the set temp.The indicator light on the controller will be on red when it's heating, will be off when it stop heating
  • 【With Built-in Thermometer】you can set the the temp from 68℉ to 90℉,temp exactness is within 2 degrees in fahrenheit. There is a built-in thermometer in the heater to detect the water temp, not need to buy seperate thermometer
  • 【Durable Quartz Glass】this aquarium heater tube is heat-resistant quartz glass made, excellent in explosion-proof, can be used in fresh water and salt water aquariums, white alundum sand as the heat-conducting media, service life can be 3 years or more
  • 【Fully Submersible】this fish tank heater is waterproof, must be fully submerged in water when working, place it horizontally or vertically near the water intake or where the way of water flow
  • Manufacture: hygger
  • Editor's Impressions Of The hygger
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

hygger Final Thoughts

"Buy with confidence!"

Those turned out to be a hit and miss. When i installed them, i let them sit in the tanks without power for 6-24 hours. --The heater itself is a bit shorter if your tank is a short one. I bought a similar one at the pet store and it barely worked. But my guys don't read them and don't listen! I am very happy with this purchase. So when I first received it it didn't work and I was very disappointed.

Overall Score
4.4


(475 Points)

5. hygger Saltwater Tank Titanium Tube Submersible Pinpoint Aquarium Heater with Digital Thermostat, IC...

User Ratings: 77 5

hygger First Impressions

"6 gallon tank."

I went ahead and went with the the larger 300W for my 45 gallon. The suction cups are large, high quality and seem to stick great. If the water runs low or air gets in the heater shuts off. Am a totally sold customer and would recommend them to anybody! I got the 200W variant for my 54 gallon corner tank that's housing goldfish. I have it set to 81F to get a 77F water temp. I left seller feedback yesterday but have yet to hear from the seller.

  • hygger Saltwater Tank Titanium Tube Submersible Pinpoint Aquarium Heater with Digital Thermostat, IC Temp Controller 50-500 Watt
  • [FULLY SUBMERSIBLE]: Our Betta Tank Heater is fully submersible in water HORIZONTALLY with 2 suction cups can be easily mounted on tank. Place it near a strong water flow so that the whole aquarium at the same temperature. Comes with a separate controller where you can easily adjust from low to high without taking out the heater from the aquarium or fish tank.
  • [SHATTERPROOF & ANTICORROSION]: Our Titanium Heater is completely shatterproof as there is NO glass in the construction– it’s made from heavy duty, durable Titanium. As it has a great feature of being anticorrosion, it is perfect for freshwater, saltwater aquariums and reef tanks.
  • [PINPOINT TEMPERATURE]: Build-in external electronic theromstat, it has DUAL LCD display that clearly shows you the temperature setting in either Celsius or Fahrenheit. Up is aquarium temperature and down is set temperature. Heater will stop heating when temperature rise exactly to your desired temp. Heating temperature range 32 to 104°F. Control accuracy is +/- 0.5° C.
  • [AUTOMATED SHUT OFF SYSTEM]: Temperature can be controlled and set to your desired degree of heat. It automatically sets off when it reached the designated temperature of your setting. Voltage: 110V
  • [TANK CAPACITY]: 200-watt aquarium heater, 10.7 inches in length. Recommended for aquariums with 20 to 45 gallons of water capacity.
  • IP68 100% Waterproof, Fully Submersible
  • Titanium Tube, Shatterproof construction, Corrosion Resistant
  • Accurate temperature control from 32°F to 104°F
  • Manufacture: hygger
  • Editor's Impressions Of The hygger
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

hygger Final Thoughts

"6 gallon tank."

I had a thermometer on opposite side of tank and the heater was dead on true. The bonus digital thermometer it came with has been super helpful, and is accurate. Sometimes it gets outside of it's ability to cool but only within a few degrees. They shipped us the upgraded version that also heats! I love the heater otherwise, but I'm afraid some water has gotten inside the heater. For Discus you need warm and accurate heater and this seems to do the trick. Those turned out to be a hit and miss.

Overall Score
4.5


(514 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. HITOP Adjustable PTC Aquarium Heater, 100W 200W 300W Submersible Fish Tank Heater for 10-120Gal Fres...

User Ratings: 72 5

HITOP HP-M3 First Impressions

"One word of caution."

So if you set it to 78 degrees, the heater will not kick on until it reads 76. I confirm it with my cooking digital probe thermometer. I recieved this product without the instructions or the added thermometer. The line is there due to regulations in certain countries. This heater warmed it right up and now my Betta and guppies are more active. But my guys don't read them and don't listen! So far I like it setup was super easy.

  • HITOP Adjustable PTC Aquarium Heater, 100W 200W 300W Submersible Fish Tank Heater for 10-120Gal Freshwater and Saltwater Fish Tank
  • [PTC ceramic heating element] Compared with the fish tank heater heated by resistance wire, this 300W PTC ceramic fish tank heater has the obvious advantages of high heating efficiency, low energy consumption, long service life and anti-rust.
  • [Adjustable and easy to use] Adjustable rang is 63-90°F. After set the temp you want, when the tank-temp reaches the set-temp, it will stop heating auto, and when the tank-temp is lower than the set-temp, it will start heating auto, easy to operate.
  • [Accurate] The ultra-sensitive internal temperature detection system can sense the tank-temp change in time, so that it can be heated and stopped in time to keep the fish at a comfortable temperature. Therefore this fish heater can also avoid overheating.
  • [Removable protective shell] This aquarium heater has a detachable protective shell, which can not only prevent aquarium pets from being injured by touching the heating part, but also can be easily removed for cleaning.
  • [Compact design/60-120gal] Size: 11.4*2.2*1.2in, simple rectangle design, not only easy to hide, but also save space. This 300W aquarium heater is suitable for 50-120 Gallon large and medium-sized fish tanks and turtle tanks.Comes with 4 suction cups and a stick-on thermometer.
  • Fast heating
  • Power saving
  • Can be used for marine fish tanks
  • Manufacture: Haisen
  • Product Dimensions: 11.4 x 2.2 x 1.2 inches; 1.24 Pounds
  • Editor's Impressions Of The HITOP HP-M3
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

HITOP HP-M3 Final Thoughts

"No copper lines!"

I waited a little bit to write the review so it could be accurate. This has been in my fish tank for a few months now and it's been absolutely perfect! I wouldn't buy any other heater, unless one of these stops working. The design is sleek and modern looking. The temperature has been holding all day, even in a colder room. This has been in my fish tank for a few months now and it's been absolutely perfect! This has been in my fish tank for a few months now and it's been absolutely perfect!

Overall Score
4.4


(361 Points)

8. 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
  • Quality
  • Value For Money
  • Affordability

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


(2 Points)

9. Hydor Slim Heater for Bettas, Bowls and Aquariums

User Ratings: 52 13

Hydor T20201 First Impressions

"And I am glad I did."

I think it works well to not stand out like other heaters. Now, both points are clear on the package instructions. Temperature is slightly off by running a little warmer. My heater is fully submerged underwater and works perfectly fine. It's pretty noticeable, but I don't really care. If the blue light is flashing it means the heater is not fully submersible. I contacted the manufacturer and they sent me a new unit in less than a week!

  • Hydor Slim Heater for Bettas, Bowls and Aquariums
  • Helps guarantee your fish a healthy life by promoting the ideal water temperature.
  • Plug and Play, No temperature to set
  • Can be positioned under gravel
  • No glass components
  • Heater is UL listed
  • Manufacture: Hydor USA, Inc.
  • Product Dimensions: 6.5 x 0.25 x 3.25 inches; 4 Ounces
  • Editor's Impressions Of The Hydor T20201
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

Hydor T20201 Final Thoughts

"Overall happy."

The temperatures are pretty accurate. The temperature gauge is fairly accurate in my 55 gallon tank. It took me a few days slowly turning the dial up to finally get it where I wanted. The heater protector was very heavy plastic and slim lined which is great. They promptly fixed the issue without any delays or drama. I adjusted the set temperature a little lower to be more in the range I wanted. Sometimes you may have to tinker around with the dial.

Overall Score
3.9


(1510 Points)

10. 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)

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