Editor's Choice - Our Favorite Submersible Aquarium Heaters

1. Eheim Jager Aquarium Thermostat Heater

User Ratings: 72 7

Eheim 3619090 First Impressions

"I angled it."

For Discus you need warm and accurate heater and this seems to do the trick. I wouldn't buy any other heater, unless one of these stops working. Maintains it well except when the weather is already warm then it over heats it. I like how the heater is constructed. This is only day one though, so I shall keep an eye one it. The design is sleek and modern looking. Pressing and holding the button for 5 seconds changes it from F to C readouts.

• Eheim Jager Aquarium Thermostat Heater
• Fully submersible
• Thermo safey control protects against running dry
• Will automatically turn off when water level dips too low
• TruTemp dial recalibrates the heater for precise temperature regulation
• Made of shock resistant and shatter proof glass for fresh or marine water
• On/Off indicator light for at-a-glance monitoring
• Manufacture: Eheim

• Editor's Impressions Of The Eheim 3619090
• Heat Quality [star rating='3.7']
• Quality [star rating='5']
• Value For Money [star rating='4']
• Affordability [star rating='4']

Peoples Choice - Other Highly Rated Submersible Aquarium Heaters

2. FREESEA Aquarium Heater Fish Tank Submersible Heater (50W/75W/100W) with LED Temperature Display

User Ratings: 68 7

FREESEA FS28-50W First Impressions

"Until the next time."

The controller is easy to use, very accurate and reliable. I have only had minor problems with the suction cups. Personally for me the housing doesn't bother me. The setting always stayed the same. My fish likes to get close to it and he has never been hurt by it. The line is there due to regulations in certain countries. Per my thermometers, they are all staying constant.

• FREESEA Aquarium Heater Fish Tank Submersible Heater (50W/75W/100W) with LED Temperature Display
• ★ Temperature range: 59°F~94°F, display Fahrenheit °F, this heater is designed for1~10 gallons tank.
• ★ 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.
• ★ Touch button, cyclic adjust temperature , easy to use and Safety.
• ★【Note】:this heater is 100% submersible use only, during its heating time, heater must be 100% submerged into the 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: Guang Zhou City Freesea Industrial Co.,Ltd
• Product Dimensions: 2.5 x 1.5 x 3.5 inches; 8.15 Ounces

• Editor's Impressions Of The FREESEA FS28-50W
• Heat Quality [star rating='4.7']
• Quality [star rating='3.7']
• Value For Money [star rating='3.7']
• Affordability [star rating='3.3']

3. Marina Betta Fish Submersible Heater for Fish Tank Aquarium, 1.5 gallons, 11182

User Ratings: 64 10

AquaClear 11182 First Impressions

"So far it seems great!"

I went ahead and went with the the larger 300W for my 45 gallon. Keeps the water consistent and it's easy to adjust! There is no protection from it banging on the glass tank. I have a few of these and I use them in my 55 gallons tanks and a 29 gallon tank. I would definitely recommend this product. This is a powerful heater that holds temperature very well. So when I first received it it didn't work and I was very disappointed.

• Marina Betta Fish Submersible Heater for Fish Tank Aquarium, 1.5 gallons, 11182
• 8-watt submersible fish tank heater for aquariums up to 1.5 gallons (5 L)
• Creates ideal conditions for bettas to live in
• Made of durable polymer, which is tougher than glass
• Easy to install in your betta fish tank; use the suction cups to place on the side of the betta tank
• Automatically reaches set temperature; allowing you to easily maintain your fish aquarium
• Use in combination with the Marina Standing Thermometer (sold separately) for accurate temperature readings
• Manufacture: Marina
• Product Dimensions: 1.7 x 5.3 x 7.1 inches; 6.3 Ounces

• Editor's Impressions Of The AquaClear 11182
• Heat Quality [star rating='5']
• Quality [star rating='4.4']
• Value For Money [star rating='5']
• Affordability [star rating='4.6']

4. FREESEA 25/50/100/200/300 Watt Aquarium Heater with Aquarium Submersible Thermometer

User Ratings: 66 8

FREESEA First Impressions

"7L Imagitarium tank."

I use a 50 for a 5 gal and a 10 gal tank. I used to try those other cheap heaters sold on amazon. I will be ordering more of these in the future. Temperature is slightly off by running a little warmer. I adjusted the set temperature a little lower to be more in the range I wanted. Easy enough to let it run all the time. It comes with a hanging kit and can be secured on the edge of the tank.

• FREESEA 25/50/100/200/300 Watt Aquarium Heater with Aquarium Submersible Thermometer
• ★【50 Watt Heater】: This Aquarium heater is suitable for 5 to 15 gallons aquariums, Length - 6.8 inch,voltage 110-120V, power cord is 4.0 ft, please choose the right wattage aquarium heater according to our size chart.
• ★【Temperature range】: 63°F~95°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.
• ★【Note】: 1. Aquarium heater is 100% submersible use only, during its heating time, heater must be 100% submerged into the water.,Please unplug the power supply when cleaning the fish tank or aquarium water changes. 2. Heater rod is suitable for people over 16 years of age. Children or minors should be under adult guidance or supervision.
• ★【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: 11.3 x 3 x 2 inches; 8.61 Ounces

• Editor's Impressions Of The FREESEA
• Heat Quality [star rating='4.6']
• Quality [star rating='4']
• Value For Money [star rating='3.5']
• Affordability [star rating='3.4']

Honorable Mentions - More Top Selling Submersible Aquarium Heaters

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 [star rating='5']
• Quality [star rating='5']
• Value For Money [star rating='4']
• Affordability [star rating='4.6']

6. Orlushy Mini Aquarium Heater 50W 100W 150W,Small Fish Tank Heater with LED Digital Temperature Displ...

User Ratings: 71 7

Orlushy First Impressions

"Very pleased so far."

Also were nice along the whole process. I have a 10gallon tank that was at 72 degrees. We would consider a replacement and then we would return the defective unit. I have a few of these and I use them in my 55 gallons tanks and a 29 gallon tank. The temperature difference was very minor. --Temperature adjustment labeling is on top rather than on the rod. I waited a little bit to write the review so it could be accurate.

• Orlushy Mini Aquarium Heater 50W 100W 150W,Small Fish Tank Heater with LED Digital Temperature Display and External Temperature Controller for Betta Frogs Newts Turtles
• ★ 50W Submersible Aquarium Heater is Suitable for 3-10 Gallon.Temperature range: 65°F~93°F（18°C~34°C）, power cord is 5 FT.
• ★ LED Display Design: LED digital display, External temperature controller,easy to use and Safety.
• ★ The Digital Smart Aquarium Heater is a heater and thermometer combined into one, eliminating the need for more equipment in smaller tanks.
• ★ Please be sure that the heater needs to be completely sunk into water, horizontal or vertical fixed in the water cycle better place, and let the working light can be seen as clear as possible.
• ★ Applicable for freshwater and marine aquariums, aquaculture, glass containers, and hydroponic systems
• Manufacture: Nova pet supplies co.LTD
• Product Dimensions: 4 x 2.75 x 1.6 inches; 8.78 Ounces

• Editor's Impressions Of The Orlushy
• Heat Quality [star rating='3.4']
• Quality [star rating='4.7']
• Value For Money [star rating='5']
• Affordability [star rating='3.4']

7. Hydor Submersible Glass Aquarium Heater - Original Theo

User Ratings: 56 18

Hydor T11702 First Impressions

"Highly recommended."

This has been in my fish tank for a few months now and it's been absolutely perfect! Checked the accuracy of the heater with an infrared thermometer. We would consider a replacement and then we would return the defective unit. So far I like it setup was super easy. I adjusted the set temperature a little lower to be more in the range I wanted. Sometimes it gets outside of it's ability to cool but only within a few degrees. It's only been set up for a month we'll see how well it does in a few months.

• Hydor Submersible Glass Aquarium Heater - Original Theo
• High resistance - the first shatter proof heater
• Shock resistant
• Position vertical, horizontal and completely submerged
• Graduated scale for precise maintenance of set temperature
• No damage in case of running dry
• Manufacture: Hydor USA, Inc.
• Product Dimensions: 3.5 x 2 x 10 inches; 8 Ounces

• Editor's Impressions Of The Hydor T11702
• Heat Quality [star rating='3.1']
• Quality [star rating='4.5']
• Value For Money [star rating='3.5']
• Affordability [star rating='3.7']

8. Fluval M Submersible Heater

User Ratings: 80 3

Fluval A782 First Impressions

"The seller was wonderful."

I think it works well to not stand out like other heaters. If the water runs low or air gets in the heater shuts off. I have only had minor problems with the suction cups. They promptly fixed the issue without any delays or drama. This has the best controller that I have found on the market. I will be ordering more of these in the future. This is a powerful heater that holds temperature very well.

• Fluval M Submersible Heater
• Aquarium heater that blends into the aquarium environment with built-in reflective technology that mirrors the surrounding colors
• Computer-calibrated thermostat and easy-to-adjust temperature control dial
• Shock resistant Borosilicate glass and high density ceramic heat sick
• Easy to install with slim profile tube for easy placement
• 100-watt heater suitable for freshwater and saltwater aquariums up to 30 gallons with a 3-year warranty
• Quality heater made in Europe using superior components and construction
• Sleek and compact
• Ideal for 100 L (30 US gal) aquariums
• Manufacture: Fluval
• Product Dimensions: 1.8 x 4.8 x 14.8 inches; 8.82 Ounces

• Editor's Impressions Of The Fluval A782
• Heat Quality [star rating='5']
• Quality [star rating='4.7']
• Value For Money [star rating='5']
• Affordability [star rating='3.7']

9. Mylivell Aquarium Heater Submersible Auto Thermostat Fish Tank Water Heater and Adjustable Temperatu...

User Ratings: 70 5

Mylivell First Impressions

"Great concept."

This has been in my fish tank for a few months now and it's been absolutely perfect! The heater is super thin and the reflective surface is interesting. I recieved this product without the instructions or the added thermometer. Keeps the temperature within 1 degree of what you set it to at all times. I think it works well to not stand out like other heaters. Thanks for the great customer service! The suction cups are large, high quality and seem to stick great.

• Mylivell Aquarium Heater Submersible Auto Thermostat Fish Tank Water Heater and Adjustable Temperature with Suction Cups
• High Quality: Aquarium heater made of high quality quartz glass, double seal material , advanced design, ensures safe operation.
• Adjustable Temperature: The temperature of the fish tank heater can be adjusted automatically. Temperature setting range: 20°~34°C(65° F - 93° F), and the display is easy to read.
• Fully Submersible. Power: 100W. Suggested water volume: 20 gal.
• Both suiting for fresh or saltwater aquariums, provide a constant warm environment for your tropical fish to stay healthy.
• Convenient and Safe: Our aquarium heater thermostat has two suction cups for attachment to the fish tank. The polarized plug prevents electrical shock.
• Mylivell Submersible Aquarium Heaters are one of the most popular way to keep your tank at a steady and controlled temperature, Fish water heater will be your best choice!
• You will need an aquarium heater to keep your tank in a steady and controlled temperature, as proper temperature range is very important to fish and other Aquatic in winter.
• Mylivell Submersible Aquarium Heaters are one of the most popular way to keep your tank at a steady and controlled temperature, Fish water heater will be your best choice!
• Manufacture: Mylivell
• Product Dimensions: 11.6 x 2.7 x 1.5 inches; 7.2 Ounces

• Editor's Impressions Of The Mylivell
• Heat Quality [star rating='4.3']
• Quality [star rating='4.8']
• Value For Money [star rating='4.9']
• Affordability [star rating='5']

10. 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']