Top 10 Best 5 gallon aquarium heater in 2026

Last Updated - 6/25/2026

🏆Best Choice

Orlushy

Orlushy Submersible Aquarium Heater,300W Adjustable Fish Tahk Heater with 2 Suction Cups Free Thermometer Suitable for Marine Saltwater and Freshwater

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•★300W aquarium heater is suitable for 40 to 55 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

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$21.99

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HITOP

HITOP 25W 50W 100W 200W 300W Adjustable Aquarium Heater, Submersible Fish Tank Heater Thermostat with Suction Cup (50W)

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•🐟HITOP aquarium heater 50W, length 7.2-inch, power cord 4.9ft, designed for small fish tanks, recommended for aquariums up to 15 Gallons.
•🐟 Thickened Glass: 2mm thickened quartz glass, 33% thicker than 1.5mm normal aquarium heaters, much safer for human and your lovely fishes, your pets will no longer fear the winter.
•🐟Adjustable and easy to use: This aquarium heater, adjustable temperature range 68 ~ 93 °F, after setting the temp you want, will on or shut off automatically when the water temperature changes, no extra adjustment is required.
•🐟Accurate Temperature Control: This fish tank heater built-in thermostat, will automatically keep the water at the set temperature within±2°F error. Comes with an sticker thermometer to detect water temp at any time.
•🐟 Easier installation, you can install it with any angle by 2 powerful suction cups, just make sure it is under water fully. Besides, we provide 1 more extra suction cup for spare (total 3 PCS), and we provide 12 months after-sales service.

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$12.58

$14.97

-16%

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HiTauing

HiTauing Aquarium Heater, 50W/100W/200W/300W/500W Submersible Fish Tank Heater with Over-Temperature Protection and Automatic Power-Off When Leaving Water for Saltwater and Freshwater

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•🐠【Rapid Heating and Two Temperature Control System】300W aquarium heater is sutable for 40-75 gallon fish tank and made of the most stable nickel-chromium heating wire, which can quickly and stably conduct heat to the surroundings. It has a built-in temperature control system of Fahrenheit and Celsius(Temp range: 63-94℉/17-34℃). You can press and hold the button next to the controller for 2-3 seconds to switch.
•🐠【Intelligent Water Sensor and Over Temperature Protection】This fish tank heater has a unique intelligent temperature and water sensor system, the heater will automatically stop heating when the heater is completely out of water or it rapidly heats beyond the set temperature, the indicator light will turn green in both cases to ensure the maximum safety of you and your aquatic organisms just like protecting our own safety.
•🐠【Explosion-proof Quartz Glass Aquarium Heater】The submersible aquarium heater is made of explosion-proof quartz glass material and a high-temperature resistant nickel-chromium heating wire with silicon carbide heat conduction, faster water heating and longer lasting. And the stronger black shell is a high temperature resistant ABS material which protect the fish, your aquatic organisms and you from scalding.
•🐠【Accurate External Digital Display Controller】The external IC temp controller of this aquarium water heater can show the water temp with 2 red LED digits. The temperature in Fahrenheit and Celsius is displayed, which can be switched by pressing and holding the button for a few seconds. To set the temp, just press the button over and over until the screen displaying the temp you desired, the setting is done and the led shows the current water temp again.
•🐠【Wide Range of Use】This 300 watt adjustable aquarium heater is suitable for many occasions. The fish market is a common place for us. It can maintain the freshness of fish. They are also suitable for places where aquatic life such as fish tanks, aquariums, and small fish ponds are kept. There are strong suction cups on the heater guard and the thermometer, it's easy to install the aquarium heater no to the tank walls or bottom, please keep them fully submerged.

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$30.19

$37.99

-21%

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HiTauing

HiTauing Aquarium Heater, 50W/100W/200W/300W/500W Submersible Fish Tank Heater with Over-Temperature Protection and Automatic Power-Off When Leaving Water for Saltwater and Freshwater

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•🐠【Rapid Heating and Two Temperature Control System】100W aquarium heater is sutable for 10-20 gallon fish tank and made of the most stable nickel-chromium heating wire, which can quickly and stably conduct heat to the surroundings. It has a built-in temperature control system of Fahrenheit and Celsius(Temp range: 63-94℉/17-34℃). You can press and hold the button next to the controller for 2-3 seconds to switch.
•🐠【Intelligent Water Sensor and Over Temperature Protection】This fish tank heater has a unique intelligent temperature and water sensor system, the heater will automatically stop heating when the heater is completely out of water or it rapidly heats beyond the set temperature, the indicator light will turn green in both cases to ensure the maximum safety of you and your aquatic organisms just like protecting our own safety.
•🐠【Explosion-proof Quartz Glass Aquarium Heater】The submersible aquarium heater is made of explosion-proof quartz glass material and a high-temperature resistant nickel-chromium heating wire with silicon carbide heat conduction, faster water heating and longer lasting. And the stronger black shell is a high temperature resistant ABS material which protect the fish, your aquatic organisms and you from scalding.
•🐠【Accurate External Digital Display Controller】The external IC temp controller of this aquarium water heater can show the water temp with 2 red LED digits. The temperature in Fahrenheit and Celsius is displayed, which can be switched by pressing and holding the button for a few seconds. To set the temp, just press the button over and over until the screen displaying the temp you desired, the setting is done and the led shows the current water temp again.
•🐠【Wide Range of Use】This 100 watt adjustable aquarium heater is suitable for many occasions. The fish market is a common place for us. It can maintain the freshness of fish. They are also suitable for places where aquatic life such as fish tanks, aquariums, and small fish ponds are kept. There are strong suction cups on the heater guard and the thermometer, it's easy to install the aquarium heater no to the tank walls or bottom, please keep them fully submerged.

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$23.55

$30.99

-24%

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AQUANEAT

AQUANEAT Aquarium Heater, 50W Fish Tank Heater, Adjustable Submersible Water Thermostat with Thermometer

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•The 50W aquarium heater is recommended for 5 to 15 gallon fish tank; heater length: 6.75”; power cord: 3.6ft; voltage: 110V/60Hz
•Adjustable Temp: An easy-to-access dial on the top makes it a breeze to adjust the water temp from 65°F to 89°F.
•Steady Temp: The red light automatically shuts off when the target temp is reached and then the heater keeps a constant temperature in your marine or freshwater aquarium.
•Includes: 1x 50W Small Aquarium Heater, 2x Suction Cups, 1x Thermometer Strip
•Cautions: Always keep it fully submerged under water before plugged in, and unplug it and wait for at least 10 mins before you do aquarium maintenance or take it out of water.

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$8.88

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HiTauing

HiTauing Aquarium Heater, 300W Fish Tank Heater with LED Digital Display & 5 Safety Protection, Submersible Aquarium Heater with 2 Suction Cup and 8.2Ft Cord for 40-75 Gallon Fish Tank.

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•【Aquarium Heater 300W】-- The 300 watt aquarium heater produces stable power with quick heat up. It's length is 10.6'', voltage 110-120V, power cord is 8.2ft (cable cord length: 4.6 feet, power cord length: 3.6 feet) . Aquarium heater for 40 to 75 gallons, ideal uses for the marine saltwater and freshwater, fish tanks, turtle tanks, betta tanks, small ponds, and so much more.
•【Safe and Durable Fish Tank Heater】-- The components of this 300W fish tank heater are designed for safety and durability, and encased in a high-durability ABS shell. The nickel-chromium heating wire and quartz glass are made of high-temperature resistant materials, along with explosion-proof quartz sand, giving the product a high level of safety and durability.
•【Comprehensive Protection Submersible Aquarium Heater】-- Our submersible aquarium heater have 2 intelligent protector to avoid damage to the product and its circuitry. ①Over max temp warning, when the temperature is higher than the maximum temperature 94℉/34℃, the code HH appears and automatically stop heating. ②Off-water warning, when the submersible aquarium heater is higher than the level of the fish tank water code E1 appears and automatically stop heating.
•【Tank Heater with Digital Display and 2 Suction Cups 】-- Tank Heaterwith a digital display temperature control system, you can monitor the water temperature and set temperature in real time. Variable temperature settings range: 63-94℉/ 17-34℃. Press and hold the button 3S to switch ℉ and ℃. Each press will ±1℉. Red light is on when heating and green light is on when temperature is hold.
•【Hitauing Submersible Water Heater Services】-- As a brand seller, our main purpose is to provide our dear customers with high quality aquarium heater and to take responsibility for your purchases. We promise to give you a 2-year warranty services from the date of purchase. If you have any problems with our submersible water heater in the future, please do not hesitate to let us know and we will do our best to help you slove it.

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$39.59

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Fluval

Fluval M 200-Watt Submersible Aquarium Heater – High-Performance, Compact Heating with Mirror Technology for Fresh & Saltwater Tanks

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•Powerful & Consistent Heating: The Fluval M 200-Watt Submersible Heater delivers precise and reliable temperature control, ensuring a stable environment for freshwater and saltwater aquariums. Ideal for tanks up to 65 gallons
•Exclusive Mirror Technology: Designed with innovative reflective technology, this heater seamlessly blends into the aquarium by mirroring its surroundings, enhancing the tank’s aesthetics without disrupting the view
•Sleek & Compact Design: The slim profile of this heater allows for easy placement without taking up unnecessary space. Its discreet appearance keeps the focus on your fish and plants while maintaining efficient performance
•Premium European Craftsmanship: Made in Europe with superior materials and components, this heater is designed for exceptional durability, efficiency, and long-lasting performance in both freshwater and saltwater tanks
•Easy to Install & Use: The Fluval M 200-Watt heater features a user-friendly design for quick installation and simple adjustments, ensuring optimal temperature regulation for a safe and comfortable aquatic habitat

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$36.99

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Aqueon

Aqueon Aquarium Fish Tank Preset Heater For Up To 75 Gallons, 200 Watts

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•Preset to 78°, accurate to +/- 1°
•No adjustment required
•Shatter resistant
•Fully submersible, auto shut-off when overheats, resets when cools down
•LED light turns on when aquarium water is being heated
•Ideal for aquariums up to 75 gallons

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$23.28

$25.10

-7%

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AHJ

Aquarium Heater for 40-55-75 Gallon, 300W Submersible Fish Tank Water Heater with Accurate Temperature Control, Over-Temp Protect, Auto Shut-Off, Quick Heat up for Saltwater & Freshwater

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•🐟🌡️[Accurate Temperature Control +-1 °F] 🐟 It ensures the water temperature is accurate at the setting temperature +-1°F. Different from others, thanks to the integrated design in which the PID temp-chip and nickel-chromium wires are connected directly. When the AHJ aquarium heater is in the water, it could detect the real temperature super fast and make regulations quickly. Ensure a stable and warm water comfortable for your aquatic fishes, betta, turtle
•🐟🌡️[Upgrade Intelligent Safety Protection] 🐟Protection against overheating, Over-temperature, and lack of water protection, Anti-dry burning functions. Safeguard your fish and aquarium with advanced safety measures. When the water temperature exceeds 94℉, the LCD digital display will display HH and keep flashing to remind. When the digit heater detects the fish tank's lack of water, it will auto-shut off
•🐟🌡️[Heating Fast & Keeps Stable] 🐟Enjoy fast and efficient heating with the AHJ aquarium heater. Quick temperature adjustment, hassle-free setup. Experience rapid heating for your 40-70 gallon (recommend 300 watts). If you are not sure which size and watt suits your fish tank, please measure the L W H, and contact our customer service
•🐟🌡️[External Controller Easy to Use] 🐟The heater must be fully submerged to work properly. Conveniently adjust settings by the external controller without wetting your hands. Press the setting button, the thermometer will change 1℉(63℉-93℉) cycle setting. Red LED light on means the heater working and the water is heating. Blue LED light on means the water temperature is kept constant. Very convenient to read and compare the temperature from LCD screen
•🐟🌡️[High Quality with Longer life span] 🐟Before the digital aquarium heater delivery, we have 100% conducted a 72-hour heating test in water to ensure the safety of the product. Using a thick quartz tube, 1.5m/4.75 ft cable(U.S. UL Certified), high temperature resistant protective case which Prevents water plants from adhering to the quartz glass wall and protects small fish not touching the quartz tube

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$29.99

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HANLESHUKA

Submersible Aquarium Heater 100W/200W/300W/500W, Fish Tank Heater with high-Temperature Protection and Turtle Tank Heater with Automatic Power-Off When Leaving seawater or Freshwater.

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•🍀【Premium Safety & Durability】,with advanced intelligent frequency conversion technology,the water temperature constant precision can reach 1℉. The aquarium heater will automatically stop heating when it exceeds the set temperature by 1℉; it will automatically turn on the heating mode when it falls below the set temperature by 1℉.
•🍀【Versatile and Efficient Heating】: Ideal as a fish tank heater, turtle tank heater, or submersible heater, this device is suitable for various aquatic environments. With its silicon carbide thermal conductivity capabilities, it provides fast and even heating, ensuring a stable temperature for your fish or turtles. A 100W aquarium heater is ideal for tanks ranging from 10 to 40 gallons.
•🍀【Smart Dual Temperature System】: Featuring a dual temperature system, this heater allows you to freely switch between Fahrenheit and Celsius by holding both buttons on the temperature controller for 2-3 seconds. The intuitive design makes it easy to monitor and adjust the temperature, catering to both beginners and experienced aquarists.
•🍀【Advanced Safety Features】: Equipped with high-temperature protection, the heater automatically shuts off when the temperature exceeds the set limit by 1 degree, preventing overheating. The waterless power-off function ensures the heater stops working when it is 5 cm above the water surface and restarts when submerged again. Additionally, an alarm will sound during high-temperature protection or waterless power-off, alerting you to potential issues.
•🍀【User-friendly design and easy installation】: The heater is equipped with sturdy suction cups on both the heater guard and the temperature controller, making it easy to install on the tank wall or bottom. The LED indicator turns red when heated and green when the set temperature is reached or exceeded, providing clear visual feedback. Its compact and efficient design ensures hassle-free use while keeping your pet on the water safe and comfortable.

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$31.99

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