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. Hitop 50W 100W 300W Submersible Adjustable Aquarium Heater, for 5 – 65 Gallon Fish Tank (300W for ...

User Ratings: 59 10

HITOP-Fish First Impressions

"This heater is excellent."

Will update my review if any changes occur. But my guys don't read them and don't listen! The heater is being used in a 40 gallon breeder. Once I opened the box i noticed the quality of the construction. Personally for me the housing doesn't bother me. Ick for instance detaches from fish at 86 degrees and dies at 89. Also I like how it shows both the current temperature and the set temperature.

  • Hitop 50W 100W 300W Submersible Adjustable Aquarium Heater, for 5 – 65 Gallon Fish Tank (300W for 25~65gallon)
  • Explosion Proof: 2mm thickened explosion proof glass, 33% thicker than the normal, safer for both human and animals.
  • Application:300W water heater is suitable for 20 – 50 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 10-slot multi-branched heating wire ceramic frame, shorter length, 11*1*1 in(27*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: 11 x 1 x 1 inches; 11.22 Ounces
  • Editor's Impressions Of The HITOP-Fish
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

HITOP-Fish Final Thoughts

"9 degrees."

Would be great to be able to tune that to. But I am single and don't have to worry about this. --The heater itself is a bit shorter if your tank is a short one. I recieved this product without the instructions or the added thermometer. I have had to turn the dial to about 78-79 for the tank to stay around 76 degrees. Keeps the temperature within 1 degree of what you set it to at all times. I like the fact that it comes with a digital thermometer.

Overall Score
4.1


(109 Points)

3. UPMCT Aquarium Heater, 50W 100W 300W Submersible Fish Tank Heater with Thermometer Strip Adjust Knob...

User Ratings: 62 12

UPMCT First Impressions

"Love this heater!"

It is safe and dependable and comes with a one year warranty. I was worried about the quality but I am thoroughly impressed with this heater! I dont know, and havent tried just yet. We wish the controls were available in Farenheit also to make things a little easier. Beware, but we are hoping for a good outcome! I dont know, and havent tried just yet. Come on Fluval, expect better from you.

  • UPMCT Aquarium Heater, 50W 100W 300W Submersible Fish Tank Heater with Thermometer Strip Adjust Knob Thermostat, Suitable for 5 to 85 Gallons
  • 【Quality Assurance】High-purity thick quartz explosion-proof crystal tube is used on the surface, there will be no rust spots, causing heavy metal damage to the fish. The double sealing waterproof can also prevent electric leakage, the fish will not be electrocuted due to leakage of the product. A heating guard with a high suction cup is provided as a gift, and the fish will not be burnt due to the fish touching the aquarium heater. Keep your fish live in a carefree warmth at any time!
  • 【Wide Range Of Temperature Adjustment】Bimetallic material, precise temperature control. Adjustable temperature ranges from 68°F to 94°F(20°C - 34°C), and you can choose the coziest temperature for your fish. (The suitable temperature range for most tropical fish is 76°F to 80°F/24°C -27°C ). At the same time, a temperature sticker is attached to the fish tank, allowing you to intuitively detect temperature changes at any time, so that you can use it with more confidence.
  • 【Suitable For 5-85 Gallon Tanks】50W aquarium heater is suitable for a 5 to 15 gallon tank, 100W aquarium heater is suitable for a 15 to 25 gallon tank. 300W aquarium heater is suitable for a 50 to 85 gallon tank. It is suitable for fresh water and sea water! Please confirm the wattage, tank capacity and other details before purchasing to select the aquarium heater with appropriate wattage.
  • 【Easy To Install】Can be installed vertically or horizontally, but the aquarium heater must be completely submerged in water. We also recommend placing it near a strong water flow, where the outlet of the mains filter is ideal, so that the temperature of the entire aquarium is the same.
  • 【How To Use】Immerse the aquarium heater completely into the aquarium or tank, wait for 10-15 minutes to let the internal temperature adapt to the actual water temperature in the tank. Then twist the thermostat knob, adjust the temperature to 68°-94°F and then connect to the power supply.
  • Manufacture: UPMCT
  • Product Dimensions: 10.5 x 1.1 x 1.1 inches; 10.5 Ounces
  • Editor's Impressions Of The UPMCT
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

UPMCT Final Thoughts

"No issues."

All seem to vary between 1-2 degrees of each other which doesn't concern me much. The temperature gauge is fairly accurate in my 55 gallon tank. I would definitely recommend this product. The red light means it's off, blue light means the temperature is constant. I got a hold of Amazon, who put me in touch with the seller. Ick for instance detaches from fish at 86 degrees and dies at 89. No biggie, but annoying nonetheless.

Overall Score
4.1


(379 Points)

4. Teco WiFi Capable TK-1000 Tank Chiller, 1/4 HP w/Built in Heater

Teco First Impressions

"Pricing was good."

The temperature gauge is fairly accurate in my 55 gallon tank. I bought a similar one at the pet store and it barely worked. I use this little heater for my 10 gallon quarantine tank. Easy to read the temp and know exactly how warm the water is. 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. They promptly fixed the issue without any delays or drama.

  • Teco WiFi Capable TK-1000 Tank Chiller, 1/4 HP w/Built in Heater
  • The Teco WiFi Capable TK-1000 Tank Chiller, 1/4 HP w/ Built in Heater, features an internationally-recognized high-end compressor and titanium coaxial heat exchanger for high performance, low energy consumption and low noise levels. A unique feature of this chiller is the integrated 400 watt heater.
  • This version is designed to work with the TECOnnect WiFi Controller (separate purchase) that works with your smart phone to set and monitor water temperatures. Most importantly, the Controller will sound an alarm when your set temperature is out of range.
  • 9 degree cooling up to 260 gallons. 39 degrees cooling for 55 gallon aquariums. Note: These temperature pull-down ratings are in ideal situations. We highly recommend purchasing a chiller one size larger than the specifications would lead you to believe is necessary.
  • Does not have a pump. The required flow through the chiller is between 132 gph and 211 gph. Includes integrated 400 watt heater. Dimensions: 12.2" x 12.2" x 18.03". 5/8" tube diameter In/Out Water Connection.
  • Works with the TECOnnect, a WiFi Controller (not included). The TECOnnect works with Android 4.1 or higher and iOS 8.2 and higher.
  • Manufacture: Teco
  • Editor's Impressions Of The Teco
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

Teco Final Thoughts

"I like this heater."

The heater is super thin and the reflective surface is interesting. Also were nice along the whole process. I used to try those other cheap heaters sold on amazon. The controller is easy to use, very accurate and reliable. The cover over the heating tubes is great, the turtles claws can't damage the tube. Product was received fast, works excellent! I adjusted the set temperature a little lower to be more in the range I wanted.

Overall Score
5.0


(1 Points)

5. AquaTop Titanium Heater w/Controller

User Ratings: 70 7

AquaTop TH-C500 First Impressions

"Just bought a second one!"

It does blend well in some setups and may look bulky in others. I have only had minor problems with the suction cups. I hope these suction cups work very well. The setting always stayed the same. 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. This heater is NOT fully submersible.

  • AquaTop Titanium Heater w/Controller
  • Age Range Description: All Life Stages
  • Manufacture: Aquatop
  • Product Dimensions: 12 x 3 x 4 inches; 13.6 Ounces
  • Editor's Impressions Of The AquaTop TH-C500
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

AquaTop TH-C500 Final Thoughts

"Same suckers for years!"

For Discus you need warm and accurate heater and this seems to do the trick. Now, both points are clear on the package instructions. I love the heater otherwise, but I'm afraid some water has gotten inside the heater. So far I like it setup was super easy. Come on Fluval, expect better from you. We would consider a replacement and then we would return the defective unit. I left seller feedback yesterday but have yet to hear from the seller.

Overall Score
4.4


(119 Points)

6. 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)

7. BOEESPAT Aquarium Heater 300W,Fish Tank Heater with Anti Scald Protector and Adjustable Thermostat S...

User Ratings: 51 24

BOEESPAT First Impressions

"FIVE STARS!"

I have it set to 81F to get a 77F water temp. The temperature gauge is fairly accurate in my 55 gallon tank. I contacted the manufacturer and they sent me a new unit in less than a week! If the blue light is flashing it means the heater is not fully submersible. There is a misconception on the internet that the heater isn't fully submersible. I'm not a big fan of the big glass tubes. The temperature gauge is fairly accurate in my 55 gallon tank.

  • BOEESPAT Aquarium Heater 300W,Fish Tank Heater with Anti Scald Protector and Adjustable Thermostat Suitable for Saltwater and Freshwater,One Extra Free Thermometer(40 to 60 gallons)
  • 300W aquarium heater is suitable for 40 to 60 gallons can be used in fresh water and salt water aquariums,easy to hide in the tank
  • Adjustable aquarium heater from 68°F to 93°F. A good temperature range for most fishes is 76°F to 80°F . An additional stick-on thermometer as a bonus to detect water temp at any time
  • Fish Tank Heater Explosion Proof,2mm thickened quartz glass Length - 14.5 inch,voltage 110-120V, power cord is 37.4ft
  • Made of high quality quartz glass, Waterproof double seal material , black protective container, shatter-resistant construction, ensures safe operation and keep your fishes from scalding and punching Heater
  • After set the temp you want, automatic switch device and temperature detection system, water heater will turn off automatically when its temp reaches your pre-set, also will turn on when lower than your set, relieved and simple operation
  • Manufacture: BOEESPAT
  • Batteries: 1 LR44 batteries required. (included)
  • Editor's Impressions Of The BOEESPAT
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

BOEESPAT Final Thoughts

"Best value."

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 adjusted the set temperature a little lower to be more in the range I wanted. Those turned out to be a hit and miss. At this time I highly recommend this product. I have a 10gallon tank that was at 72 degrees. The temperature difference was very minor.

Overall Score
3.6


(100 Points)

8. Famus Aquarium Fish Tank Heater Protective Case Detachable Designed Cover with Suction Cups(42.5 cm)...

Famus First Impressions

"Seems very well built."

It is a bonus that the heater is titanium. If the blue light is flashing it means the heater is not fully submersible. Once attached to the tank wall I've had no issues with it coming off. Pressing and holding the button for 5 seconds changes it from F to C readouts. There is a misconception on the internet that the heater isn't fully submersible. I like to keep it at 72 and from my thermometer it is reading at exactly 72. You don't have to worry about wide temperature swings with this unit.

  • Famus Aquarium Fish Tank Heater Protective Case Detachable Designed Cover with Suction Cups(42.5 cm)
  • Manufacture: Famus
  • Editor's Impressions Of The Famus
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

Famus Final Thoughts

"Easy to unpack."

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. I bought a similar one at the pet store and it barely worked. The temperatures are pretty accurate. Temperature is slightly off by running a little warmer. I use a 50 for a 5 gal and a 10 gal tank. I got this heater for my 55 gallon aquarium.

Overall Score
3.0


(1 Points)

9. Uniclife Aquarium Heater Submersible with Thermometer, 300 Watt for 80 Gallon Fish Tank

User Ratings: 69 7

Uniclife First Impressions

"Will buy again."

It is a bonus that the heater is titanium. I had a thermometer on opposite side of tank and the heater was dead on true. I recieved this product without the instructions or the added thermometer. Very easy to install and the adjustable temperature gauge is pretty accurate. Maintains it well except when the weather is already warm then it over heats it. This has been in my fish tank for a few months now and it's been absolutely perfect! Just be careful and keep an eye on your temp settings when you have kids over!

  • Uniclife Aquarium Heater Submersible with Thermometer, 300 Watt for 80 Gallon Fish Tank
  • Ideal for 50-80 gallons 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 turn 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 11.2" x 1" (L x D)
  • Come with Uniclife aquarium heater x 1; Suction Cups x 3; stick-on thermometer x 1(The 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

"This heater works great."

This does a great job at regulating the temp in my 10 gallon. I adjusted the set temperature a little lower to be more in the range I wanted. --The heater itself is a bit shorter if your tank is a short one. No biggie, but annoying nonetheless. The setting always stayed the same. This is a great heater that is very easy to set up and program. There is no protection from it banging on the glass tank.

Overall Score
4.4


(138 Points)

10. ZEROYOYO Fish Tank Fan Aquarium Cooling Fan USB Charge Hang On Chiller for Water Plants Mini Fish Ta...

User Ratings: 23 42

ZEROYOYO First Impressions

"Well written but vague."

Once attached to the tank wall I've had no issues with it coming off. And I get to keep the first one I bought! They promptly fixed the issue without any delays or drama. Those turned out to be a hit and miss. My marina heater takes a few hours. I was worried about the quality but I am thoroughly impressed with this heater! I'm not a big fan of the big glass tubes.

  • ZEROYOYO Fish Tank Fan Aquarium Cooling Fan USB Charge Hang On Chiller for Water Plants Mini Fish Tank
  • material: plastic,Colour: Black
  • in Aquarium Heaters & Chillers
  • Waterproof design, good quality,Made of new high quality materials for long life
  • Provide a more suitable temperature for the fish tank to make the fish life more comfortable
  • Products include: 1 * mini fan
  • Manufacture: ZEROYOYO
  • Editor's Impressions Of The ZEROYOYO
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

ZEROYOYO Final Thoughts

"Thank you for reading."

Also were nice along the whole process. Well worth the money the first one I bought still works great. I emailed the email it says to and told them. The bonus digital thermometer it came with has been super helpful, and is accurate. No biggie, but annoying nonetheless. I would definitely recommend this product. They promptly fixed the issue without any delays or drama.

Overall Score
3.0


(5 Points)

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