Editor's Choice - Our Favorite Cobalt Aquatics Aquarium Heaters

1. Cobalt Aquatics Flat Neo-Therm Heater with Adjustable Thermostat (Fully-Submersible, Shatterproof De...

User Ratings: 69 13

Cobalt Aquatics 31005 First Impressions

"Works as intended."

I love the heater otherwise, but I'm afraid some water has gotten inside the heater. My fish likes to get close to it and he has never been hurt by it. I emailed the email it says to and told them. Bought it as a chiller for the k40 CO2 laser. Very easy to install and the adjustable temperature gauge is pretty accurate. Now, both points are clear on the package instructions. Beware, but we are hoping for a good outcome!

  • Cobalt Aquatics Flat Neo-Therm Heater with Adjustable Thermostat (Fully-Submersible, Shatterproof Design) from 25W to 300W
  • Super-flat design. Fully submersible, modern design for energy efficient Aquarium and terrarium heating. Includes reversible holster/bracket, which allows heater to face inward or outward. See the product images to determine the best neo-therm size for your tank.
  • Accurate, one-touch system. Simply set temperature between 66-96°f with one touch and the neo-therm electronic thermostat will maintain Tank temperature within +0.5°F. Led displays both set temp and actual temp, simultaneously.
  • Ultimate safety and reliability. Integrated thermal protection circuitry prevents heater from overheating. If you forget to turn it off, the neo-therm will automatically shut it down.
  • Virtually indestructible. Unlike cheap, glass heaters, the neo-therm is a resin/thermoplastic heater with a shatterproof outer-casing. Made in Poland and includes a 3-year warranty.
  • Manufacturer You can trust. Most manufacturers rate their heaters on the ability to raise an aquarium 2-3°f above ambient temperatures. This is unreliable and misleading, as the average home fluctuates 2-3°f or more throughout the day. Cobalt rates The neo-therm on the ability to raise a tank 11°f above ambient temperatures, so you will never have to worry about overworking the neo-therm or it keeping up!
  • Manufacture: Cobalt International Inc.
  • Product Dimensions: 2.25 x 1.25 x 11 inches; 8 Ounces
  • Editor's Impressions Of The Cobalt Aquatics 31005
  • Heat Quality [star rating='4.2']
  • Quality [star rating='5']
  • Value For Money [star rating='3.8']
  • Affordability [star rating='4.9']

Cobalt Aquatics 31005 Final Thoughts

"Well written but vague."

It comes with a hanging kit and can be secured on the edge of the tank. I have 3 of the Fluval heaters, in various sizes. This little heater is perfect; this is our third purchase of the same heater. I have only had minor problems with the suction cups. It took me a few days slowly turning the dial up to finally get it where I wanted. I use this little heater for my 10 gallon quarantine tank. I dont know, and havent tried just yet.

Overall Score
4.2

[star rating="4.2"]
(1419 Points)

2. Aqua Euro USA Apex Chiller Horsepower: 1/10 HP

Aqua Euro USA AC10A First Impressions

"I do recommend."

And kids love pushing all sorts of buttons. If the blue light is flashing it means the heater is not fully submersible. Come on Fluval, expect better from you. It is safe and dependable and comes with a one year warranty. Also I like how it shows both the current temperature and the set temperature. I will definitely be buying another one for my other tanks at bigger one. This this is amazing and is worth the money.

  • 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 [star rating='4']
  • Quality [star rating='2.9']
  • Value For Money [star rating='2.8']
  • Affordability [star rating='4.5']

Aqua Euro USA AC10A Final Thoughts

"Not very reasonable."

I like the fact that it comes with a digital thermometer. 210 gallon ones and one 90 gallon bow front tank. What more could you ask for great job Hygger Duncan. This heater warmed it right up and now my Betta and guppies are more active. The temperature lights up so it's very easy to read. Maintains it well except when the weather is already warm then it over heats it. The bonus digital thermometer it came with has been super helpful, and is accurate.

Overall Score
3.7

[star rating="3.7"]
(2 Points)

3. Fish Tank Water Heater Chiller, 100-240V Water Cooling Heating Machine Thermostat for Aquarium 35L U...

Estink First Impressions

"I would call that a win."

Thanks for the great customer service! This this is amazing and is worth the money. This is only day one though, so I shall keep an eye one it. I was worried about the quality but I am thoroughly impressed with this heater! Product was received fast, works excellent! We would consider a replacement and then we would return the defective unit. I'm in the process of setting up for tanks.

  • Fish Tank Water Heater Chiller, 100-240V Water Cooling Heating Machine Thermostat for Aquarium 35L US Plug
  • 【Advantages and Function】Semiconductor refrigeration, environmental protection without pollution. Mute, low-power design. Digital display and advanced microcomputer intelligent temperature control technology are adopted. Celsius temperature and Fahrenheit temperature switching function. Suitable for small-scale refrigeration heating, aquaculture, aquarium.
  • 【Danger】When installing a cold water machine or hand in the water, please be sure to unplug the power plug first;When the thunder comes, please unplug the power wipe head; To prohibit the use of wet hand plug, pull the power plug, otherwise it will cause electric shock or injury;Please use a dedicated power outlet, do not share the same socket with other high-power electrical appliances at the same time, avoid causing the current too large to cause fire.
  • 【Warning】Please use AC220V or 110V power supply, please do not use other power supply (according to the different regions of the use of the power supply voltage is not the same, can not be universal, please note);This product is prohibited to be placed in a stable, high temperature, direct sunlight, smoke, ventilation, moisture in a large location;Prohibition block the vents. Do not store foreign objects near the vents;To prohibit the insertion of metal debris, wire, needle and other
  • 【Cleaning and maintenance】Before cleaning and maintenance, please make sure that the power plug has been pulled out; Please use a clean and absorbent soft cloth to wipe the cover, the body and other parts to keep the appearance clean. (Note: please do not use a wet cloth to wipe the operation panel, plug and power cord.); Do not use corrosive liquid medicine and hard objects to clean the product. (detergent powder, gasoline, banana water, hard brush, etc.)
  • 【Attention】When in use, the product is forbidden to be inverted or horizontal;Pull off the plug, you must hold the plug handle, can not pull the power cord, or easy to damage the power cord;When handling, please unplug the power cord plug, Do not put in the high temperature environment (room temperature 36℃ above, fish tank bottom tank, sealed place, etc.), may cause the slow cooling or failure.
  • Estink is a registered brand and it is professional in various product categories for several years. Advanced equipment with solid techniques are adopted and our high quality products are strictly tested before being put into market. 'Quality First, Customer Superior' is always our aim. Every product is designed carefully aiming to add simple and comfortable elements to your lives.
  • Semiconductor refrigeration, environmental protection without pollution.Mute, low-power design.Digital display and advanced microcomputer intelligent temperature control technology are adopted.Celsius temperature and Fahrenheit temperature switching function.Suitable for small-scale refrigeration heating, aquaculture, aquarium.
  • The attachment
  • Manufacture: Estink
  • Editor's Impressions Of The Estink
  • Heat Quality [star rating='4']
  • Quality [star rating='3.8']
  • Value For Money [star rating='5']
  • Affordability [star rating='5']

Estink Final Thoughts

"Very easy and accurate."

The line is there due to regulations in certain countries. This heater is NOT fully submersible. I emailed the email it says to and told them. --The heater itself is a bit shorter if your tank is a short one. I have a 10gallon tank that was at 72 degrees. If the blue light is flashing it means the heater is not fully submersible. It took me a few days slowly turning the dial up to finally get it where I wanted.

Overall Score
4.0

[star rating="4"]
(1 Points)

4. hygger Submersible Aquarium Heater, Adjustable Fish Tank Heater Compact Reliable Betta Heater, Heat-...

User Ratings: 63 11

hygger First Impressions

"That wasn't a good sign."

We wish the controls were available in Farenheit also to make things a little easier. After several weeks of running the heater. Come on Fluval, expect better from you. It just cycles through to 93f and starts over. I adjusted the set temperature a little lower to be more in the range I wanted. I appreciate the exterior temp readout and control module. Just be careful and keep an eye on your temp settings when you have kids over!

  • hygger Submersible Aquarium Heater, Adjustable Fish Tank Heater Compact Reliable Betta Heater, Heat-Resistant Milky Quartz Made, with External Temp Controller, 100W/300W, 10-60 Gallon
  • 【For Fish Tank 30-60 gallon】300W aquarium heater, voltage 110-120V, power cord is 5.4ft, please choose the right wattage aquarium heater according to our size chart. Don't suggest use this heater in sump or a tank with turtles in
  • 【Reliable & Safty Protection】automatically shut off when fault occurs. Effectively maintain the tank water in the constant temp you set, stop heating when the water temp is 1.5-2℉ above the set temp and restart heating when the water temp is 1.5-2℉ below the set temp
  • 【Temp adjustable】with external temp controller, set the temp to one of these values you can see on the dial: 75, 77, 79, 81, 83, 85, 87, 89, 91 by rotating the pointer, the heater will not work if you set the temp to other degrees between those values. Temp exactness is within 2 degrees in fahrenheit. There is a built-in thermometer in the heater to detect the water temp
  • 【Durable & Compact】this aquarium heater tube is heat-resistant milky quartz 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. A very compact heater, easy to hide in the tank
  • 【Fully Submersible】this fish tank heater is waterproof, must be fully submerged in water when working, stick it horizontally onto the tank side near the water intake or where the way of water flow
  • Voltage: 100-120V
  • Frequency: 60HZ
  • Manufacture: hygger
  • Editor's Impressions Of The hygger
  • Heat Quality [star rating='3.9']
  • Quality [star rating='3.1']
  • Value For Money [star rating='4.6']
  • Affordability [star rating='3.7']

hygger Final Thoughts

"9 degrees."

The line is there due to regulations in certain countries. I left seller feedback yesterday but have yet to hear from the seller. Easy to read the temp and know exactly how warm the water is. It's only been set up for a month we'll see how well it does in a few months. Those turned out to be a hit and miss. I tested it by unplugging and replugging it. I dont know, and havent tried just yet.

Overall Score
4.1

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

5. DECJ Submersible Aquarium Heater, 25W/50W/100W/150W/200W/ Fish Tahk Heater, with Adjust Knob Thermos...

DECJ First Impressions

"Very quick shipping."

If the blue light is flashing it means the heater is not fully submersible. I bought a similar one at the pet store and it barely worked. This has the best controller that I have found on the market. They shipped us the upgraded version that also heats! I tested it by unplugging and replugging it. This is only day one though, so I shall keep an eye one it. The bonus digital thermometer it came with has been super helpful, and is accurate.

  • DECJ Submersible Aquarium Heater, 25W/50W/100W/150W/200W/ Fish Tahk Heater, with Adjust Knob Thermostat 2 Suction Cups and Free Thermometer, Suitable for Marine Saltwater and Freshwater,150watt
  • IP68 WATERPROOF: This fish tank heater is waterproof, must be fully submerged in water when working, stick it with suctions horizontally or vertically onto the tank side near the water intake or where the way of water flow. Please unplug the power supply when cleaning the fish tank or aquarium water changes.
  • LED DISPLAY: Electronic Thermostat accurate to +/- 1 ℃, no need to buy another thermometer, Clearly show the temperature you set, the red indicator light is on when it start to heat your tank, and the blue indicator is on when tank reaches the temperature you regulates.
  • OVER-HEATED & SAFTY PROTECTION: When water temperature reaches to set temperature value, heater will automatically stop heating, when water temperature is lower than the set temperature, heater will automatically start heating. When lack of water, the heater will stop working to prevent dry burning.
  • TEMP ADJUSTABLE(℃/℉ Switchable): The temperature adjustable range is from 68℉ to 94℉ (20℃-34℃), which is suitable for different aquariums,hydroponics growing system,various ornamental fish and amphibious turtles. Essential for arowana, aquarium fish, fish ponds, and turtles.
  • UNIQUE WATER CHANGER: The water filter has a built-in porous filter to prevent fish or water grass and sand from being sucked out; the water control valve can adjust the water flow size, which is conducive to cleaning relatively small sand and gravel.
  • Manufacture: Aquarium Heaters & Chillers
  • Editor's Impressions Of The DECJ
  • Heat Quality [star rating='4.5']
  • Quality [star rating='5']
  • Value For Money [star rating='4.8']
  • Affordability [star rating='4.8']

DECJ Final Thoughts

"Love this heater!"

My marina heater takes a few hours. They shipped us the upgraded version that also heats! And I get to keep the first one I bought! Takes a little while to drop the temps if it is hot in the garage. The heater is super thin and the reflective surface is interesting. I am very happy with this purchase. I like the fact that it comes with a digital thermometer.

Overall Score
5.0

[star rating="5"]
(1 Points)

6. Ehm Heater Jager 300w

User Ratings: 72 7

Eheim First Impressions

"Works fine."

But I am single and don't have to worry about this. I noticed my old hygger heater beginning to fail and my wife ordered this one. I have a few of these and I use them in my 55 gallons tanks and a 29 gallon tank. Well I bought a second one took me only one trying to get the right temperature. So if you set it to 78 degrees, the heater will not kick on until it reads 76. No biggie, but annoying nonetheless. I went ahead and went with the the larger 300W for my 45 gallon.

  • Ehm Heater Jager 300w
  • Jager Trutemp Aquarium Heater 20" 300 Wt
  • Manufacture: EHEIM
  • Editor's Impressions Of The Eheim
  • Heat Quality [star rating='5']
  • Quality [star rating='4.4']
  • Value For Money [star rating='4.1']
  • Affordability [star rating='3.7']

Eheim Final Thoughts

"Quality was amazing."

If the water runs low or air gets in the heater shuts off. This heater warmed it right up and now my Betta and guppies are more active. We would consider a replacement and then we would return the defective unit. The temperature has been holding all day, even in a colder room. It is a bonus that the heater is titanium. It just cycles through to 93f and starts over. Seems to keep the temp n the tank fairly regular.

Overall Score
4.4

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

7. 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 [star rating='3.6']
  • Quality [star rating='4.2']
  • Value For Money [star rating='5']
  • Affordability [star rating='4']

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

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

8. 300 Watt Aquarium Heater Fast Heating Titanium Tube Saltwater Fully Submersible Fish Tank Heaters wi...

Periha HF-300W First Impressions

"Highly recommended."

Per my thermometers, they are all staying constant. It's pretty noticeable, but I don't really care. Just be careful and keep an eye on your temp settings when you have kids over! This product came in the nick of time! They shipped us the upgraded version that also heats! Was very impressed with the quality of this heater. There is no protection from it banging on the glass tank.

  • 300 Watt Aquarium Heater Fast Heating Titanium Tube Saltwater Fully Submersible Fish Tank Heaters with LED Digital Temperature External Controller Freshwater Safety Pinpoint Thermostat 53-80 Gallon
  • ✅ STRONG ANTI-CORROSION: The tank heater is made of high-quality, durable titanium alloy, no glass, do not worry, it will be shattered. And its strong anti-corrosion features make it perfect for freshwater, saltwater aquariums, and reef tanks.
  • ✅ SAFE EXTERNAL CONTROL: With external thermostat, no need to take out the heater from the aquarium or tank, easily adjust the temperature you want without getting your hands wet, prevent electric shock & burns, keep you and your family safe.
  • ✅ ACCURATE TEMP CONTROL: LCD display can clearly show the temperature setting in either Celsius or Fahrenheit, just press and hold the “SET” button for 3-4s. Heating temperature ranges from 68 to 93°F(14-34℃). Control accuracy is +/- 0.5° C, providing a constant warm aquarium for your pet fish to stay healthy.
  • ✅ EASY TO SETUP & USE: This heater is fully submersible in water HORIZONTALLY with 2 strong suction cups, not easy to move and drop off, preventing your pets from harm and burning. Place it near a strong water flow to keep the whole tank at the same temperature.
  • ✅ AQUARIUM CAPACITY: 300W stable output power, the heater fits for aquariums with 53-80gallons(300 Liters) of water capacity. We offer a 1-year limited warranty, if you have any questions, pls contact us first, we will respond within 24 hours to solve the problem.
  • Manufacture: Periha
  • Product Dimensions: 11.23 x 0.75 x 0.2 inches; 1.15 Pounds
  • Editor's Impressions Of The Periha HF-300W
  • Heat Quality [star rating='5']
  • Quality [star rating='5']
  • Value For Money [star rating='5']
  • Affordability [star rating='5']

Periha HF-300W Final Thoughts

"Love these slim heaters!"

This is only day one though, so I shall keep an eye one it. I waited a little bit to write the review so it could be accurate. I got a hold of Amazon, who put me in touch with the seller. The temperatures are pretty accurate. I am very happy with this purchase. My marina heater takes a few hours. --Temperature adjustment labeling is on top rather than on the rod.

Overall Score
5.0

[star rating="5"]
(9 Points)

9. boxtech Aquarium Heater, 50W/100W/300W Explosion Proof Submersible Thermostat with Adjust Knob and 2...

User Ratings: 69 8

boxtech First Impressions

"Best addition to my tank."

There is no protection from it banging on the glass tank. Sometimes you may have to tinker around with the dial. I got this heater for my 55 gallon aquarium. Awesome chiller, perfect for Hydroponics. The heater is easy; turn the dial to set temp and plug in. 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.

  • boxtech Aquarium Heater, 50W/100W/300W Explosion Proof Submersible Thermostat with Adjust Knob and 2 Suction Cups Suit Marine Saltwater and Freshwater
  • Fish Tank Heater: 300W aquarium heaters suit for 30 - 80 Gallon fish tank. Voltage:110V, power cord is 5.57ft, Max deep water immersion 20 inch/1.7 FT
  • Correct installation: Stick the heater vertical onto the tank side near the water intake or on the way of water flow.(This way the heater can quickly sense the water temperature and make adjustments automatically), Keep the aquarium heater fully submerged in water
  • Fully Automatic Control: Design with External Temperature Controller, Temperature Range is 68 ºF-90 ºF, when water temperature achieve the setting temperature, heater will automatically stop heating, when water temperature is lower than the setting temperature, heater will automatically start heating
  • Quartz Tube Safety Protection: Made of heat-resistant milky quartz Glass and UL-Approved Power Cord, Controller IPX4, Heater IPX8 that make it pretty shatter-proof and Explosion-proof and prevents electricity leakage, service life can be 3 years or more
  • Notice Please: Before you clean the aquarium or change water, pls must cut off the heater power, after 10 minute cooling then take out the heater and regularly clean the scale on the heater
  • Temperature Control: Design with External Temperature Controller, Temperature Range is 68ºF-90ºF, when water temperature achieve the setting temperature, heater will automatically stop heating, when water temperature is lower than the setting temperature, heater will automatically start heating.
  • Voltage:110 V Frequency: 50HZ
  • Led Indicator Light:When it working, the indicator light is red.
  • Manufacture: BOXTECH
  • Product Dimensions: 13.39 x 1.97 x 3.54 inches; 11.99 Ounces
  • Editor's Impressions Of The boxtech
  • Heat Quality [star rating='4.9']
  • Quality [star rating='4.7']
  • Value For Money [star rating='4.6']
  • Affordability [star rating='3.4']

boxtech Final Thoughts

"There was only~0."

You don't have to worry about wide temperature swings with this unit. I was amazed how quickly I got to my temperature I need it 78 degrees. This has been in my fish tank for a few months now and it's been absolutely perfect! You don't have to worry about wide temperature swings with this unit. It is a bonus that the heater is titanium. I have it set to 81F to get a 77F water temp. My fish likes to get close to it and he has never been hurt by it.

Overall Score
4.3

[star rating="4.3"]
(523 Points)

10. ZHFEISY 300w Aquarium Fish Tank Cooler Electronic Water Chiller Cooling Machine 100L

User Ratings: 54 46

ZHFEISY First Impressions

"5 stars in my book!"

But my guys don't read them and don't listen! I emailed the email it says to and told them. Personally for me the housing doesn't bother me. For Discus you need warm and accurate heater and this seems to do the trick. I dont know, and havent tried just yet. It would stick out of my 30 g wide tank if I were to put it vertical. The red light means it's off, blue light means the temperature is constant.

  • ZHFEISY 300w Aquarium Fish Tank Cooler Electronic Water Chiller Cooling Machine 100L
  • 【Product Parameters】 Working voltage: AC110V /60HZ; Machine power: 300W; Take-over specifications: 8MM hose; Temperature probe length: 1.2M;
  • 【Features】1. Real-time temperature display, simple operation setting; 2, Automatic temperature control and energy saving, start cold quickly (<5 seconds)
  • 【Connection】An external pump is required to pump water or directly in series with the flow pipe.
  • 【Application】Applicable to seawater, fresh water and medium and low acid and alkaline environment.
  • 【1-Year Warranty】If you need refund/return or have any questions, plz feel free to contact us.
  • Manufacture: ZHFEISY
  • Editor's Impressions Of The ZHFEISY
  • Heat Quality [star rating='2.7']
  • Quality [star rating='3.2']
  • Value For Money [star rating='2.8']
  • Affordability [star rating='2.6']

ZHFEISY Final Thoughts

"Pricing was good."

I appreciate the exterior temp readout and control module. There is no protection from it banging on the glass tank. This heater is NOT fully submersible. I wouldn't buy any other heater, unless one of these stops working. Now, both points are clear on the package instructions. Maintains it well except when the weather is already warm then it over heats it. It would stick out of my 30 g wide tank if I were to put it vertical.

Overall Score
3.2

[star rating="3.2"]
(2 Points)

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