Editor's Choice - Our Favorite Cheap 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. Eheim Thermocontrol e100 Heater

Eheim AEH3634090 First Impressions

"The seller was wonderful."

So when I first received it it didn't work and I was very disappointed. Was very impressed with the quality of this heater. The red light means it's off, blue light means the temperature is constant. Temperature is slightly off by running a little warmer. I have 3 of the Fluval heaters, in various sizes. I wouldn't buy any other heater, unless one of these stops working. For Discus you need warm and accurate heater and this seems to do the trick.

  • Eheim Thermocontrol e100 Heater
  • With the EHEIM thermocontrol-e heating element your fish get the right temperature even more precisely - in every aquarium. The EHEIM thermocontrol aquarium control heater is a further development of the legendary heating element and thermocontrol-e is the latest electronically controlled variant. The obvious ideas are often the best. This also applies to the aquarium heating element. It is simply hung in the water and heats it up. The principle is the same as it was decades ago. But in the meantime the EHEIM controller heater has become an ultra-modern thermal device. The temperature can be set precisely from 68°F to 89°F. It is measured even more precisely and kept more constant by the electronics with a control accuracy of 0. 5 °C. The heat is kept constant with an LED that indicates the heating function. The coating on the heater is made of special laboratory glass that increases the heating surface, serves as a heat shield and ensures even heat emission. There are no cracks and hairline cracks through which condensation water could pass. It is impact resistant. And even extreme temperature fluctuations, such as those that may occur during water changes, do not affect this glass. The heater is absolutely waterproof, can be fully immersed, has a dry run protection (Thermo Safety Control) and is suitable for fresh and marine water. 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
  • Item Package Height: 3.0
  • Item Package Length: 25.0
  • Item Package Width: 3.0
  • Manufacture: Eheim
  • Editor's Impressions Of The Eheim AEH3634090
  • Heat Quality [star rating='4.8']
  • Quality [star rating='4.3']
  • Value For Money [star rating='4.2']
  • Affordability [star rating='4.4']

Eheim AEH3634090 Final Thoughts

"The FreeSea is amazing."

I confirm it with my cooking digital probe thermometer. Just be careful and keep an eye on your temp settings when you have kids over! It took me only two tries to get it to the correct temperature. This has been in my fish tank for a few months now and it's been absolutely perfect! Very easy to install and the adjustable temperature gauge is pretty accurate. I think it works well to not stand out like other heaters. I got a hold of Amazon, who put me in touch with the seller.

Overall Score
5.0

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

3. Penn-Plax Aquarium Heater Fully Submersible Within 1 Degree of Accuracy 75 Watt Heats Up to 15 Gallo...

User Ratings: 64 10

Penn-Plax CH850 First Impressions

"Quality was amazing."

I have a few of these and I use them in my 55 gallons tanks and a 29 gallon tank. Or better yet, conceal it to the back corner. I used to try those other cheap heaters sold on amazon. I went ahead and went with the the larger 300W for my 45 gallon. The line is there due to regulations in certain countries. Sometimes it gets outside of it's ability to cool but only within a few degrees. Sometimes it gets outside of it's ability to cool but only within a few degrees.

  • Penn-Plax Aquarium Heater Fully Submersible Within 1 Degree of Accuracy 75 Watt Heats Up to 15 Gallon Tank
  • Aquarium heater sets and maintains the temperature in your tank within 1 degree accuracy.
  • Features both Fahrenheit and Celsius temperature with easy to read gage.
  • Heater is fully submersible and can be placed horizontally or vertically in your tank.
  • Has a preset temperature to 76 degrees Fahrenheit but is also easily programmed.
  • Heater is safe to use on smaller fish tanks and aquariums up to 10 gallons in size.
  • Manufacture: Monster Pets
  • Product Dimensions: 7 x 1.5 x 3 inches; 1 Ounces
  • Editor's Impressions Of The Penn-Plax CH850
  • Heat Quality [star rating='3.3']
  • Quality [star rating='3.6']
  • Value For Money [star rating='3.8']
  • Affordability [star rating='4.2']

Penn-Plax CH850 Final Thoughts

"I angled it."

My heater is fully submerged underwater and works perfectly fine. They promptly fixed the issue without any delays or drama. But I am single and don't have to worry about this. This is only day one though, so I shall keep an eye one it. Come on Fluval, expect better from you. I was amazed how quickly I got to my temperature I need it 78 degrees. There is no protection from it banging on the glass tank.

Overall Score
4.2

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

4. LONDAFISH Aquarium Chillers Aquarium Fan Fish Tank Cooling Fan Marine 2 Fan

User Ratings: 60 11

LONDAFISH First Impressions

"The accuracy is perfect."

And kids love pushing all sorts of buttons. This product came in the nick of time! I use a 50 for a 5 gal and a 10 gal tank. Easy enough to let it run all the time. I got a hold of Amazon, who put me in touch with the seller. Was very impressed with the quality of this heater. It is safe and dependable and comes with a one year warranty.

  • LONDAFISH Aquarium Chillers Aquarium Fan Fish Tank Cooling Fan Marine 2 Fan
  • Two-speed wind control,according to the indoor temperature,reduce water temperature and drop up to 2 ~ 3℃
  • Adjustable jaws can clamp the the cylinder wall that the thickness within 1.2cm,meet the daily use of fish tanks
  • Great cooling fans 12V safe voltage,with high security standards and ensure the safety of the fan
  • Angle adjustable:Adjustable width of fan and bracket up to 100°,practical and easy to install and move
  • Safety Packing With Wonderful After Sale Service: The powerful jet lighter is packaged in an attractive gift box which is a great gift for yourself, friends and families. We provide with 90 days return and refund service and all the emails will be replied within 24 hour. We provide lifetime technique support, if you have any question, please feel free to contact us.
  • Great cooling fans provide powerful ventilation to reduce heat transference from aquarium equipment. Extremely quiet operation with adjustable positioning, perfect for saltwater aquarium(reef and frag tank) and fresh water aquarium.
  • No assembly required, easy and convenient for use. Easy installation(clamp mounting bracket).
  • Low power consumption, adjustable 2 level of wind force.
  • Manufacture: LONDAFISH
  • Editor's Impressions Of The LONDAFISH
  • Heat Quality [star rating='5']
  • Quality [star rating='4.8']
  • Value For Money [star rating='3.1']
  • Affordability [star rating='4.2']

LONDAFISH Final Thoughts

"No issues."

It took me a few days slowly turning the dial up to finally get it where I wanted. The bonus digital thermometer it came with has been super helpful, and is accurate. The line is there due to regulations in certain countries. I have it set to 81F to get a 77F water temp. The cover over the heating tubes is great, the turtles claws can't damage the tube. The temperatures are pretty accurate. I dont know, and havent tried just yet.

Overall Score
4.1

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

5. HITOP Adjustable Submersible Aquarium Heater, 50W 100W 120W Fish Tank Heater for 5-35 Gallon (50W fo...

User Ratings: 68 7

HITOP First Impressions

"Until the next time."

Come on Fluval, expect better from you. We wish the controls were available in Farenheit also to make things a little easier. Easy to read the temp and know exactly how warm the water is. There is no protection from it banging on the glass tank. I was worried about the quality but I am thoroughly impressed with this heater! The temperature has been holding all day, even in a colder room. This is a powerful heater that holds temperature very well.

  • HITOP Adjustable Submersible Aquarium Heater, 50W 100W 120W Fish Tank Heater for 5-35 Gallon (50W for 5-10 Gallon)
  • [Size]: 100W aquarium heater with cover Height:9.5in/diameter:1.5in. Situable for fish tank 10-35gallon(fresh water and seawater).
  • [Safety design]: This is a glass aquarium heater with a strong protective cover, which can effectively prevent fish or turtles from hitting and touching. Note that this protective cover cannot be removed.
  • [Steady Temperature-control]: After the temperature is set, this fish heater will automatically turn on and off to maintain the water temperature at the set temperature.
  • [Easy to use and adjustable]Adjustable fish tank heater from 68°F to 93°F , The best temperature range for most fishes is 76°F-80°F.
  • [Attention]:Because of the protective cover, the volume will be larger than the conventional glass heater, but the protective cover is tri-prism shape, which can save some space.
  • Manufacture: Haisen
  • Editor's Impressions Of The HITOP
  • Heat Quality [star rating='3.4']
  • Quality [star rating='3.8']
  • Value For Money [star rating='3.8']
  • Affordability [star rating='3.8']

HITOP Final Thoughts

"No worries, though."

The bonus digital thermometer it came with has been super helpful, and is accurate. You program it for temperature you want your tank to be. Well I bought a second one took me only one trying to get the right temperature. Sometimes you may have to tinker around with the dial. The heater protector was very heavy plastic and slim lined which is great. So if you set it to 78 degrees, the heater will not kick on until it reads 76. I left seller feedback yesterday but have yet to hear from the seller.

Overall Score
4.3

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

6. FEDOUR Adjustable Aquarium Heater with Protective Cover, 30W 50W 60W 120W Submersible Heater Thermos...

User Ratings: 69 4

FEDOUR First Impressions

"Great heater."

The temperature lights up so it's very easy to read. I love the heater otherwise, but I'm afraid some water has gotten inside the heater. At this time I highly recommend this product. I tested it by unplugging and replugging it. Am a totally sold customer and would recommend them to anybody! Once attached to the tank wall I've had no issues with it coming off. If the blue light is flashing it means the heater is not fully submersible.

  • FEDOUR Adjustable Aquarium Heater with Protective Cover, 30W 50W 60W 120W Submersible Heater Thermostat for 5-40Gallon Fish and Turtle Tank
  • More Power and Longer Life: This heater is for 15-40 gallon fish tank, comparing to 100W, this 120W aquarium heater is more powerful and heating the same water in shorten time. Less working time provide longer life.
  • Double Safety Protection: 2mm thickened explosion-proof glass, 33% thicker than normal 1.5mm aquarium heaters, adding a specialized protective cover wrapping the heater tube, more durable and much safer for both human and aquatic creature.
  • Application: 120W suitable for15-40gallon fish tank, suitable for both fresh and marine water, suitable for all kinds of fish, turtle and plants. Size: 24cm in Length.
  • High-precision temperature control system, adjustable temperature ranges from 20°C - 34°C (68°F to 93°F).
  • Complete accessories: An additional stick-on thermometer as a bonus to detect water temp at any time, and an extra suction cup providing for spare. Offering 12 months warranty for the whole heater.
  • Install the suction cups on the heater according to the installation diagram.
  • Please pay more attention to the change of the water temperature during the first week.
  • Manufacture: IBAY
  • Editor's Impressions Of The FEDOUR
  • Heat Quality [star rating='4.9']
  • Quality [star rating='3.4']
  • Value For Money [star rating='3.4']
  • Affordability [star rating='4.4']

FEDOUR Final Thoughts

"The accuracy is perfect."

The heater is super thin and the reflective surface is interesting. Once attached to the tank wall I've had no issues with it coming off. It took me a few days slowly turning the dial up to finally get it where I wanted. I went ahead and went with the the larger 300W for my 45 gallon. The line is there due to regulations in certain countries. I confirm it with my cooking digital probe thermometer. I'm in the process of setting up for tanks.

Overall Score
4.4

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

7. 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)

8. Jhua 300W Aquarium Heater Explosion-Proof Fish Tank Heater Submersible Aquarium Water Heater Adju...

User Ratings: 54 12

Jhua First Impressions

"This heater works great."

I have 3 of the Fluval heaters, in various sizes. If the water runs low or air gets in the heater shuts off. It took about an hour to reach 80f, which is fairly quick. You don't have to worry about wide temperature swings with this unit. I wouldn't buy any other heater, unless one of these stops working. So far I like it setup was super easy. Well worth the money the first one I bought still works great.

  • Jhua 300W Aquarium Heater Explosion-Proof Fish Tank Heater Submersible Aquarium Water Heater Adjustable Temperature with Protective Case & Suction Cup for 30-80 Gallon Aquarium, Fish Tank, Fish Pond
  • 【Premium Quality】Aquarium water heater made of high-purity quartz, stainless, shatter-proof and explosion-proof. Double seal design, temperature resistant material, prevent electricity leakage, safe and reliable, let your fish live happily in comfortable temperatures.
  • 【Adjustable Temperature】Setting the temperature by the button on the top of submersible water heater, you can adjust the most suitable temperature for your fish. The temperature setting range is: 16-34°C(61-93° F).
  • 【High Adsorption】 With two high adsorption suction cups, which can be firmly adsorbed on the inside of the fish tank. The aquarium heater thermostat is preferably placed at the water circulation outlet or the water inlet.
  • 【Appliction】This aquarium heater submersible is suitable for fresh or salt water aquariums, provide a warm and constant environment for your tropical fish to stay healthy. And it’s great for 30-80 gallon fish tanks, aquarium, fish pond and so on.
  • 【Attention】Please immerse the fish tank water heater completely in the water before plugging in the power. Please no take it out of the water when using it, and unplug when cleaning the fish tank or refreshing aquarium water.
  • Manufacture: Jhua
  • Editor's Impressions Of The Jhua
  • Heat Quality [star rating='3.8']
  • Quality [star rating='3.7']
  • Value For Money [star rating='4.4']
  • Affordability [star rating='3.3']

Jhua Final Thoughts

"Bought the 300W one."

Per my thermometers, they are all staying constant. I will be ordering more of these in the future. My marina heater takes a few hours. All seem to vary between 1-2 degrees of each other which doesn't concern me much. The suction cups are large, high quality and seem to stick great. Once attached to the tank wall I've had no issues with it coming off. This is only day one though, so I shall keep an eye one it.

Overall Score
3.7

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

9. 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 [star rating='5']
  • Quality [star rating='4.6']
  • Value For Money [star rating='5']
  • Affordability [star rating='5']

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

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

10. YCTECH Submersible Aquarium Heater with LED Water Thermometers for 1-35 Gallon Tropical Fish Tank, S...

User Ratings: 62 5

YCTECH First Impressions

"Amazing customer service."

Once attached to the tank wall I've had no issues with it coming off. But I am single and don't have to worry about this. The cover over the heating tubes is great, the turtles claws can't damage the tube. And kids love pushing all sorts of buttons. The line is there due to regulations in certain countries. We wish the controls were available in Farenheit also to make things a little easier. Those turned out to be a hit and miss.

  • YCTECH Submersible Aquarium Heater with LED Water Thermometers for 1-35 Gallon Tropical Fish Tank, Safe Adjustable Temperature Control, Electronic Water Heater Thermostat (50W / 75W / 100W / 200W)
  • 【Temperature Range】 15°C~34°C (59°F~93°F),it is suitable for fresh water and sea water fish tanks of ★ 1-10 gallons ★, provide comfortable environment for your beloved tropical fish ★ Submersible Use ONLY ★
  • 【 Smart Temperature Control 】 the micro chip will automatically keep the water in the fish tank at the temperature you set and keep it stable
  • 【Easy To Use】press the button of the thermostat to set the temperature,the temperature will changer within the cyclic temperature range ,just stop when you set it right
  • 【Power-Off Memory Function】 the aquarium heater will automatically remember the temperature you set before power off,you don’t have to set the temperature every time
  • 【Excellent service】24 hours customer service online, any questions please contact us at any time.If you are not satisfy with this Aquarium Heater for any reason in 30 days, we will refund the cost. you can return the new one for free if there is problem within a year.
  • Manufacture: CHOSION
  • Product Dimensions: 2.5 x 1.6 x 3.7 inches; 8.78 Ounces
  • Editor's Impressions Of The YCTECH
  • Heat Quality [star rating='3.3']
  • Quality [star rating='3.4']
  • Value For Money [star rating='3.9']
  • Affordability [star rating='3.6']

YCTECH Final Thoughts

"I bought the 7."

I got the 200W variant for my 54 gallon corner tank that's housing goldfish. When i installed them, i let them sit in the tanks without power for 6-24 hours. This little heater is perfect; this is our third purchase of the same heater. So far I like it setup was super easy. They promptly fixed the issue without any delays or drama. I hope these suction cups work very well. The heater is easy; turn the dial to set temp and plug in.

Overall Score
4.2

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

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