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
  • 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)

2. hygger Submersible Aquarium Heater,100W /300W Adjustable Fish Tank Heater with External Temp Control...

User Ratings: 73 9

hygger First Impressions

"5 gallons."

I have it set to 81F to get a 77F water temp. I dont know, and havent tried just yet. Easy enough to let it run all the time. The temperature gauge is fairly accurate in my 55 gallon tank. It took about an hour to reach 80f, which is fairly quick. I love the heater otherwise, but I'm afraid some water has gotten inside the heater. It's only been set up for a month we'll see how well it does in a few months.

  • hygger Submersible Aquarium Heater,100W /300W Adjustable Fish Tank Heater with External Temp Controller Auto Thermostat Heater for 10-60 Gallon Saltwater and Freshwater Tank
  • 300W AQUARIUM HEATER: For 30 to 60 gallon fish tanks, with a precision probe inside, it is possible to monitor heat more efficiently and avoid "cooking fish", and it can be fixed on the inner glass of the aquarium with suction cup without disturbing the fish.
  • TEMPERATURE ADJUSTMENT: Set the temperature on the adjustment wheel outside the aquarium. The adjustment knob of submersible aquarium heater can select the temperature between 75°F and 91°F , Temp Control Accuracy:±2℉,Temp Accuracy:±1℉, without worrying about hand wetness.
  • FULLY AUTOMATIC CONTROL: When the water temperature is higher than the set temperature value, the fish tank heater will automatically stop; if the water temperature is lower than the set temperature, the heater will automatically start heating (error is 1.5-2°F).
  • OVERHEAT PROTECTION: When the water temperature is over 97°F, the aquarium heater will auto shut down. If a fault occurs, the backup circuit in the controller will work to shut it down. It provides a warm and sustainable environment while keeping a safe life for fish.
  • RELIABLE QUALITY: Use milky quartz material, can resist a high temp of 1800 fahrenheit degree, excellent in explosion-proof and shatter-resistant, to prevent burns on your pet. Fish tank water Heater is suitable for saltwater and freshwater, fast heating, corrosion resistance and oxidation resistance.
  • Manufacture: hygger
  • Editor's Impressions Of The hygger
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

hygger Final Thoughts

"Very pleased so far."

There is no protection from it banging on the glass tank. There is a misconception on the internet that the heater isn't fully submersible. --The cylinder or rod diameter is bigger. They shipped us the upgraded version that also heats! All seem to vary between 1-2 degrees of each other which doesn't concern me much. I like to keep it at 72 and from my thermometer it is reading at exactly 72. There is no protection from it banging on the glass tank.

Overall Score
4.3


(135 Points)

3. Inkbird ITC308S Temperature Controller for Aquarium with Submersible Probe, Heating Cooling Outlets ...

User Ratings: 84 3

Inkbird First Impressions

"This is a quality heater."

I have 3 of the Fluval heaters, in various sizes. It's pretty noticeable, but I don't really care. We received the chiller promptly and put it into use. Just be careful and keep an eye on your temp settings when you have kids over! This heater is NOT fully submersible. No biggie, but annoying nonetheless. It does blend well in some setups and may look bulky in others.

  • Inkbird ITC308S Temperature Controller for Aquarium with Submersible Probe, Heating Cooling Outlets Thermostat for Heater and Cooling Fans
  • Temperature Control Mode: On/Off Control. Cooling and Heating control.
  • Fully submersible probe. Aquarium probe works better in water than standard probe.
  • Temperature calibration; Over-temperature and sensor fault alarm. Dual display window, be able to display measured temperature and set temperature at the same time.
  • Maximum output load: 1200W (110V).
  • It's an all in one, simple solution providing control of cooling and heating.
  • ITC-308S is an easy-to-use, safe and reliable dual relay output temperature controller.
  • It can be used as Over-temperature protection and automatic temperature control system for various electric appliances such as equipment for home-brew, aquarium, pet breeding, incubation, BBQ, seedling heat mats, oven temperature control, terrestrial heat control, constant temperature cycle of heating pump, culture fermentation, accelerating germination, electric radiator, electric oven, etc.
  • Manufacture: LERWAY Tech.
  • Editor's Impressions Of The Inkbird
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

Inkbird Final Thoughts

"Looks as advertised."

I got a hold of Amazon, who put me in touch with the seller. Once attached to the tank wall I've had no issues with it coming off. I adjusted the set temperature a little lower to be more in the range I wanted. --Temperature adjustment labeling is on top rather than on the rod. I had a thermometer on opposite side of tank and the heater was dead on true. --The cylinder or rod diameter is bigger. But my guys don't read them and don't listen!

Overall Score
4.7


(105 Points)

4. FREESEA Aquarium Fish Tank Heater: 50 | 100 | 300 Watt Adjustable Thermostat with 2 Suction Cups & T...

User Ratings: 70 10

FREESEA First Impressions

"Quality was amazing."

Thanks for the great customer service! This little heater is perfect; this is our third purchase of the same heater. Bought it as a chiller for the k40 CO2 laser. Will update my review if any changes occur. The line is there due to regulations in certain countries. This product came in the nick of time! It took me only two tries to get it to the correct temperature.

  • FREESEA Aquarium Fish Tank Heater: 50 | 100 | 300 Watt Adjustable Thermostat with 2 Suction Cups & Thermometer for Betta Tank | Saltwater Tank | Aquarium | Coral Tank
  • ★【300Watt Heater】: This Aquarium heater is suitable for 40 to 60 gallons aquariums, Length - 12.6 inch,voltage 110-120V, power cord is 4.0 ft, please choose the right wattage aquarium heater according to our size chart.
  • ★【Temperature Range】: 64°F~93°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.
  • ★【High Quality】: This upgraded aquarium heater now updated for 2mm 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, suitable both for fresh and salt water.
  • ★【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: 13.39 x 1.18 x 0.79 inches; 10.58 Ounces
  • Editor's Impressions Of The FREESEA
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

FREESEA Final Thoughts

"Well written but vague."

The heater protector was very heavy plastic and slim lined which is great. It would stick out of my 30 g wide tank if I were to put it vertical. It took me only two tries to get it to the correct temperature. This heater works, but the dial it isn't very accurate. The bonus digital thermometer it came with has been super helpful, and is accurate. Product was received fast, works excellent! It is safe and dependable and comes with a one year warranty.

Overall Score
4.3


(44 Points)

5. 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)

6. hygger 300W Controllable Aquarium Heater, Submersible Quartz Thermostat with Built-in Thermometer fo...

hygger First Impressions

"5 or even."

My fish likes to get close to it and he has never been hurt by it. This has been in my fish tank for a few months now and it's been absolutely perfect! The heater protector was very heavy plastic and slim lined which is great. Also I like how it shows both the current temperature and the set temperature. It took me a few days slowly turning the dial up to finally get it where I wanted. Was very impressed with the quality of this heater. I will be ordering more of these in the future.

  • hygger 300W Controllable Aquarium Heater, Submersible Quartz Thermostat with Built-in Thermometer for Fish Tank 30-60 Gallon, for Fresh Water, Salt Water
  • For Fish Tank 30-60 gallon, suitable for fresh water or marine aquariums
  • Fully submersible heater will auto shut off once the water temp is over 97℉
  • With a detachable platic guard, well protect fish and the heater
  • Set the temp on an external controller: 75, 77, 79, 81, 83, 85, 87, 89, 91
  • The power cord is 5.4ft enough long for most fish tank.
  • Manufacture: hygger
  • Editor's Impressions Of The hygger
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

hygger Final Thoughts

"Just bought a second one!"

It does blend well in some setups and may look bulky in others. So when I first received it it didn't work and I was very disappointed. Once I opened the box i noticed the quality of the construction. I use a 50 for a 5 gal and a 10 gal tank. I will be ordering more of these in the future. It took about an hour to reach 80f, which is fairly quick. Temperature is slightly off by running a little warmer.

Overall Score
5.0


(2 Points)

7. 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)

8. Aquarium Heater, 100W 300W 500w Submersible Fish Tank Heater with Titanium Tube Thermostat System LE...

User Ratings: 73 8

SeaELF First Impressions

"Temperature!"

My fish likes to get close to it and he has never been hurt by it. I like the fact that it comes with a digital thermometer. I will definitely be buying another one for my other tanks at bigger one. So when I first received it it didn't work and I was very disappointed. I will be ordering more of these in the future. I was worried about the quality but I am thoroughly impressed with this heater! Bought it as a chiller for the k40 CO2 laser.

  • Aquarium Heater, 100W 300W 500w Submersible Fish Tank Heater with Titanium Tube Thermostat System LED Digital Play and Remote Controller for 50-80 Gallon Tank
  • Premium Titanium Alloy Material & pinpoint probe : The seaELF aquarium heater made by premium titanium alloy, shatterproof, anti explosion, anti cracking and anti-corrosion than quartz glass aquarium heater and stainless steel tank heater, good for fresh water and sea water. The precise sensing probe on the top of heater for pinpoint temperature and double seal design to ensure safe operation. The heating tube with CE, RoHS, FC approved and the plug with UL approved.
  • Remote Controller & LCD Display : Update design with remote controller and LCD display , easy to setting and adjusting the aquarium heater’s temperature by remote controller and easy know the tank’s temperature by the LCD display, no need to buy extra temperature and wet your hands to setting the temperature again. (the remote is non waterproof, please keep it away from water).
  • Intelligent Overheating Protection & Lack-of Water Protection : With double sensing probe on the top, it will accurate detect the temperature and water, once overheating or the water cant cover the top of this aquarium heater, it will automatic power-off, prevent electric shock & burns and keep you and your fish safe. (E2,E8 display are mean overheating, please increase the water circulation when it happens)
  • Intelligent Thermostat Heating System :This aquarium heater made with intelligent thermostat heating system, it will heating automatically once the water temperature is less than the setting temperature and stop heating once it reached the setting temperature. Keep the aquarium water in a same temperature environment to protect fishes, amphibians, turtles and so on.(Please install it near a strong water flow).
  • 100% satisfaction : Just to show you how confident we are that your fish will enjoy the aquarium water heater, we are giving you a 6 month money-back guarantee, if there any problem when you install the heater or any un-satisfied with this product, please feel free to contact us for resend or refund, we will dealing with it within 48 hrs.
  • Manufacture: SeaELF
  • Editor's Impressions Of The SeaELF
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

SeaELF Final Thoughts

"Seems very well built."

This heater is NOT fully submersible. It took me a few days slowly turning the dial up to finally get it where I wanted. Keeps the water consistent and it's easy to adjust! And kids love pushing all sorts of buttons. Will update my review if any changes occur. No biggie, but annoying nonetheless. It's only been set up for a month we'll see how well it does in a few months.

Overall Score
4.4


(348 Points)

9. 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)

10. OASE HeatUp Aquarium Heater

User Ratings: 71

OASE Indoor Aquatics 33805 First Impressions

"5 gallon tank."

I am very happy with this purchase. My heater is fully submerged underwater and works perfectly fine. I dont know, and havent tried just yet. I would definitely recommend this product. The red light means it's off, blue light means the temperature is constant. There is no protection from it banging on the glass tank. This product came in the nick of time!

  • OASE HeatUp Aquarium Heater
  • The Oase HeatUp 300 Watt Aquarium Heater features uniform temperature level thanks to the patented bi-metal technology
  • 300 Watts. Recommended for tanks up to 80 gallons.
  • Glass construction. Fully submersible. Suction cups and bracket for securing to the aquarium.
  • Adjustable temperature control. The heating function is displayed via the activated control light. For use in fresh and saltwater aquariums.14.6" long.
  • 3 year manufacturer warranty. UL listed. Made in Italy.
  • Manufacture: Oase
  • Editor's Impressions Of The OASE Indoor Aquatics 33805
  • Heat Quality
  • Quality
  • Value For Money
  • Affordability

OASE Indoor Aquatics 33805 Final Thoughts

"Just bought a second one!"

So if you set it to 78 degrees, the heater will not kick on until it reads 76. This this is amazing and is worth the money. They shipped us the upgraded version that also heats! The temperature has been holding all day, even in a colder room. I think it works well to not stand out like other heaters. I love the heater otherwise, but I'm afraid some water has gotten inside the heater. I was worried about the quality but I am thoroughly impressed with this heater!

Overall Score
4.5


(25 Points)

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