Editor's Choice - Our Favorite Inline Aquarium Heaters

1. 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 [star rating='5']
  • Quality [star rating='4.3']
  • Value For Money [star rating='4.3']
  • Affordability [star rating='5']

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

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

2. ViaAqua 200-Watt Quartz Glass Submersible Heater with Built-In Thermostat

User Ratings: 74 5

ViaAqua VA 200Q First Impressions

"Temperature!"

Personally for me the housing doesn't bother me. It took me only two tries to get it to the correct temperature. Easy enough to let it run all the time. I left seller feedback yesterday but have yet to hear from the seller. Come on Fluval, expect better from you. This heater is NOT fully submersible. I had a thermometer on opposite side of tank and the heater was dead on true.

  • ViaAqua 200-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 12.5 inches; 9.44 Ounces
  • Editor's Impressions Of The ViaAqua VA 200Q
  • Heat Quality [star rating='4.7']
  • Quality [star rating='4.7']
  • Value For Money [star rating='5']
  • Affordability [star rating='5']

ViaAqua VA 200Q Final Thoughts

"I do recommend."

I got a hold of Amazon, who put me in touch with the seller. The controller is easy to use, very accurate and reliable. I got this heater for my 55 gallon aquarium. And kids love pushing all sorts of buttons. And I get to keep the first one I bought! I bought a similar one at the pet store and it barely worked. The design is sleek and modern looking.

Overall Score
4.5

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

3. Finnex Hang-On Electronic Controller Aquarium Heater, Titanium Tube

User Ratings: 61 12

Finnex HMA-500 First Impressions

"Yes, you read that right."

I was worried about the quality but I am thoroughly impressed with this heater! I will definitely be buying another one for my other tanks at bigger one. We received the chiller promptly and put it into use. I emailed the email it says to and told them. This heater warmed it right up and now my Betta and guppies are more active. I waited a little bit to write the review so it could be accurate. The temperature lights up so it's very easy to read.

  • Finnex Hang-On Electronic Controller Aquarium Heater, Titanium Tube
  • Titanium Tube
  • Sleek analog controller
  • HMA 500: 100-120 Gallons
  • Manufacture: JSK Merchandise Inc.
  • Product Dimensions: 14.48 x 1 x 1 inches; 14.4 Ounces
  • Editor's Impressions Of The Finnex HMA-500
  • Heat Quality [star rating='3.9']
  • Quality [star rating='4.7']
  • Value For Money [star rating='4.3']
  • Affordability [star rating='3.9']

Finnex HMA-500 Final Thoughts

"I would buy again."

This has the best controller that I have found on the market. 210 gallon ones and one 90 gallon bow front tank. The heater is easy; turn the dial to set temp and plug in. The heater is being used in a 40 gallon breeder. This heater works, but the dial it isn't very accurate. It's only been set up for a month we'll see how well it does in a few months. This product came in the nick of time!

Overall Score
4.1

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

4. PULACO 25W Small Aquarium Betta Heater with Free Thermometer Strip, Under 6 Gallon Fish Tanks

User Ratings: 75 7

PULACO PL-168 First Impressions

"5 gallon tank."

I would definitely recommend this product. It just cycles through to 93f and starts over. The setting always stayed the same. The suction cups are large, high quality and seem to stick great. I like to keep it at 72 and from my thermometer it is reading at exactly 72. Keeps the temperature within 1 degree of what you set it to at all times. I am very happy with this purchase.

  • PULACO 25W Small Aquarium Betta Heater with Free Thermometer Strip, Under 6 Gallon Fish Tanks
  • ★【Betta Heater】This Fish Tank Heater should be 100% submerged into water, Ideal for small glass or acrylic desktop aquariums up 1 to 6 Gallons, not suitable for less than 1 gallon tank.
  • ★【Quick and Easy Installation】:Vertical or horizontal placement using, Aquarium heater automatic temperature control 78℉, no need to adjust temperature, easy to operate, fishes happy.
  • ★【How it Works】: Plug in, red light turns on, the heater will start working until water temperature up to 78°F, and red light off, then the green light will turn on, heater stop working and keeping constant temperature 78°F. Accuracy:±3°F
  • ★【Note】: Do not operate or leave product plugged in when it is outside of water, Children should be use this heater under adult's guidance.
  • ★【SATISFACTION GUARANTEED】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.
  • Please install and use this heater under rated voltage conditions(110V-120V/60Hz).
  • This heater is designed for small fresh/sea water tanks, please do not use it in chemical water or any other heating purpose, it may damage the heater.
  • Children should be use this heater under adult's guidance.
  • Manufacture: PULACO
  • Product Dimensions: 5.5 x 1.2 x 2.7 inches; 4.48 Ounces
  • Editor's Impressions Of The PULACO PL-168
  • Heat Quality [star rating='5']
  • Quality [star rating='3.7']
  • Value For Money [star rating='3.5']
  • Affordability [star rating='4.7']

PULACO PL-168 Final Thoughts

"I would call that a win."

It took me a few days slowly turning the dial up to finally get it where I wanted. I have it set to 81F to get a 77F water temp. Checked the accuracy of the heater with an infrared thermometer. You program it for temperature you want your tank to be. Temperature is slightly off by running a little warmer. The heater is easy; turn the dial to set temp and plug in. The suction cups are large, high quality and seem to stick great.

Overall Score
4.5

[star rating="4.5"]
(1130 Points)

5. Uniclife Aquarium Heater Submersible with Thermometer, 50 Watt for 10 Gallon Fish Tank

User Ratings: 83

Uniclife First Impressions

"Long heater."

At this time I highly recommend this product. At this time I highly recommend this product. Per my thermometers, they are all staying constant. I waited a little bit to write the review so it could be accurate. It does blend well in some setups and may look bulky in others. If the blue light is flashing it means the heater is not fully submersible. Awesome chiller, perfect for Hydroponics.

  • Uniclife Aquarium Heater Submersible with Thermometer, 50 Watt for 10 Gallon Fish Tank
  • Uniclife submersible heater, ideal for 5-15gal 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 turned 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 8.6" x 1" (L x D)
  • Come with Uniclife aquarium heater x 1; Suction Cups x 3; stick-on thermometer x 1(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 [star rating='4']
  • Quality [star rating='4.9']
  • Value For Money [star rating='5']
  • Affordability [star rating='4.7']

Uniclife Final Thoughts

"And I am glad I did."

They shipped us the upgraded version that also heats! It took me a few days slowly turning the dial up to finally get it where I wanted. All seem to vary between 1-2 degrees of each other which doesn't concern me much. It is safe and dependable and comes with a one year warranty. The design is sleek and modern looking. I will be ordering more of these in the future. I dont know, and havent tried just yet.

Overall Score
4.8

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

6. DaToo Mini Aquarium Heater 25W Small Fish Tank Heater 25 Watt with Free Thermometer Sticker

User Ratings: 75 7

DaToo First Impressions

"Very easy and accurate."

I have only had minor problems with the suction cups. I was worried about the quality but I am thoroughly impressed with this heater! You don't have to worry about wide temperature swings with this unit. The design is sleek and modern looking. I got this heater for my 55 gallon aquarium. This heater works, but the dial it isn't very accurate. No biggie, but annoying nonetheless.

  • DaToo Mini Aquarium Heater 25W Small Fish Tank Heater 25 Watt with Free Thermometer Sticker
  • 25W Betta Aquarium Heater -- Creating and maintaining a perfect and comfortable water temperature for our cute fish is not easy, which requires a lot of effort. Now DaToo MINI 25W Aquarium Heater can help you make this easier. Precise and constant temperature, no need to set, keep the temperature of fish habitat in the best state at all times. You will find it very easy and happy to take care of pet fish!
  • Precise And Constant Temperature -- No need to set, DaToo Fish Tank Heater will automatically keep the water temperature of the fish habitat at 78℉. This temperature is very suitable for betta and most tropical fish. When the water temperature is lower than 78℉, the heater starts to heat and the red light is on. When the temperature reaches 78℉, the heater stops heating and the green light is on. DaToo will always maintain this comfortable temperature for your beloved fish!
  • The Smallest 25W Betta Heater -- For most fish lovers who have small fish tanks of 1 to 5 gallons, a small heater means more space for fish. This is the smallest 25W aquarium heater on the market, only 0.2 inches. No matter how small your fish tank is, it can be used perfectly in it, and you can't even find it. Very MINI!!
  • Safe And Durable -- Unlike traditional plastic seals, DaToo uses a rubber sealing layer, which ensures that DaToo has better sealing and safety performance, and will never leak electricity or water. Quartz glass material, explosion-proof and crack-proof, more sturdy and durable, without worrying about damage.
  • One Year Warranty & Satisfaction Guarantee -- This heater is ideal for 1 to 6 gallon small glass or acrylic desktop aquariums. When in use, it needs to be submerged 100% in water. We provide one year warranty and 24 hours professional customer service. Buy With Confidence!
  • Manufacture: DaToo
  • Editor's Impressions Of The DaToo
  • Heat Quality [star rating='3.4']
  • Quality [star rating='4.1']
  • Value For Money [star rating='5']
  • Affordability [star rating='4.9']

DaToo Final Thoughts

"Great product!"

I use a 50 for a 5 gal and a 10 gal tank. It took about an hour to reach 80f, which is fairly quick. I have had to turn the dial to about 78-79 for the tank to stay around 76 degrees. This does a great job at regulating the temp in my 10 gallon. I wouldn't buy any other heater, unless one of these stops working. It took me a few days slowly turning the dial up to finally get it where I wanted. I recieved this product without the instructions or the added thermometer.

Overall Score
4.4

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

7. Eheim Thermocontrol e50 Heater

User Ratings: 77 23

Eheim AEH3632090 First Impressions

"Works just as advertised!"

This is a great heater that is very easy to set up and program. It is a bonus that the heater is titanium. Beware, but we are hoping for a good outcome! When i installed them, i let them sit in the tanks without power for 6-24 hours. It's only been set up for a month we'll see how well it does in a few months. I appreciate the exterior temp readout and control module. I got this heater for my 55 gallon aquarium.

  • Eheim Thermocontrol e50 Heater
  • Advantages of the EHEIM control heater thermocontrol-e Precise temperature adjustment from 68°F to 89°F (20 to 32°C) No readjustment necessary Control accuracy 0. 5 °C The heat is kept constant Control lamp indicates the heating function (red: heating up; green: temperature reached) Fully submersible (waterproof) With dry-running protection (Thermo Safety Control) Glass coating increases the heating surface and ensures optimum, even heat output Including double suction holder Many sizes for aquariums from 5 to 300 gallons Suitable for fresh and marine water Highest safety and reliability Made in Germany Specifications Wattage: 50W Temperature setting range: 68°F to 89°F (20 to 32°C) Aquarium Size (approx. ) 6. 5-15 Gallons Height: 9. 2" Power Cord Length: 5. 5'
  • Item Package Height: 3.0
  • Item Package Length: 20.0
  • Item Package Width: 3.0
  • Manufacture: Eheim
  • Editor's Impressions Of The Eheim AEH3632090
  • Heat Quality [star rating='3.8']
  • Quality [star rating='3.3']
  • Value For Money [star rating='4.1']
  • Affordability [star rating='4.3']

Eheim AEH3632090 Final Thoughts

"So far so good."

I appreciate the exterior temp readout and control module. Seems to keep the temp n the tank fairly regular. I left seller feedback yesterday but have yet to hear from the seller. Also were nice along the whole process. I used to try those other cheap heaters sold on amazon. The temperatures are pretty accurate. I would definitely recommend this product.

Overall Score
4.1

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

8. Hamilton Technology Aqua Euro Max Aquarium Chiller

User Ratings: 76 6

Hamilton Technology AC25H First Impressions

"Impressive."

I'm not a big fan of the big glass tubes. Keeps the water consistent and it's easy to adjust! 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. What more could you ask for great job Hygger Duncan. You program it for temperature you want your tank to be. When i installed them, i let them sit in the tanks without power for 6-24 hours.

  • Hamilton Technology Aqua Euro Max Aquarium Chiller
  • Maintain optimum water temperature by lowering the water temperature of your tank
  • Digital led temperature display control accurately maintains desired temperature
  • Anti-Freezing system will not allow the heat exchanger to freeze
  • Manufacture: Hamilton Technology
  • Product Dimensions: 14 x 10 x 14 inches; 30 Pounds
  • Editor's Impressions Of The Hamilton Technology AC25H
  • Heat Quality [star rating='5']
  • Quality [star rating='3.6']
  • Value For Money [star rating='5']
  • Affordability [star rating='4.9']

Hamilton Technology AC25H Final Thoughts

"So far so good."

It just cycles through to 93f and starts over. Seems to keep the temp n the tank fairly regular. I like the fact that it comes with a digital thermometer. We would consider a replacement and then we would return the defective unit. I waited a little bit to write the review so it could be accurate. Awesome chiller, perfect for Hydroponics. I like the fact that it comes with a digital thermometer.

Overall Score
4.5

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

9. Uniclife 100 Watt Aquarium Heater with Thermometer, Fish Tanks Heater of 20 Gallon

User Ratings: 77

Uniclife First Impressions

"What a long."

They promptly fixed the issue without any delays or drama. This has the best controller that I have found on the market. Once attached to the tank wall I've had no issues with it coming off. I was amazed how quickly I got to my temperature I need it 78 degrees. Easy to read the temp and know exactly how warm the water is. But I am single and don't have to worry about this. I left seller feedback yesterday but have yet to hear from the seller.

  • Uniclife 100 Watt Aquarium Heater with Thermometer, Fish Tanks Heater of 20 Gallon
  • Can be used in both freshwater and saltwater, applicable for 10~25 gallon fish tanks.
  • Adjust temperature by top red knob, range 68°F-93°F. Tube temperature displayed.
  • Water-tight of IP68 sealing. 2mm shatterproof quartz housing, bottom clash-proof cover. (NOTICE: Can’t be used even just cracked a tiny bit, pls contact us for replacement)
  • Measurement 9.7" x 1" (L x D). Only allowing for vertical or horizontal installment.
  • Package include aquarium heater x 1; Suction Cups x 3; stick-on thermometer x 1.
  • 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 [star rating='4.4']
  • Quality [star rating='4.2']
  • Value For Money [star rating='5']
  • Affordability [star rating='4.6']

Uniclife Final Thoughts

"Good product."

I appreciate the exterior temp readout and control module. I like the fact that it comes with a digital thermometer. I have it set to 81F to get a 77F water temp. The red light means it's off, blue light means the temperature is constant. Keeps the temperature within 1 degree of what you set it to at all times. The bonus digital thermometer it came with has been super helpful, and is accurate. We wish the controls were available in Farenheit also to make things a little easier.

Overall Score
4.5

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

10. 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)

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