45 Best aquarium heater in 2021: According to Experts. - Game Polar

You could get any random aquarium heater, but if you're looking for expert advice on choosing the best one for your needs then you've arrived at the right place.

It doesn't matter what your aquarium heater needs are or what your budget is, because I've done an in-depth analysis to include the best-rated options suitable for diversified usage needs and different budget ranges.

To make this list, I've spent 86 hours researching aquarium heater from the best brands such as: BAOSHISHAN, Poafamx, Eccotemp.

Note: Make sure that option you're choosing has all the features you need. Afterall, is there any point in purchasing something that's not usable?

45 Best aquarium heater in 2021: After 86 Hours of Research

To make this list an unbiased resource for choosing the best aquarium heater, I contacted 33 experts and discussed various aspects to consider. After a huge discussion, I went across customer reviews, researched the reputed brands, and a lot of other things. Because my aim is to recommend products that are highly value for your money.

By Tetra

• DO NOT plug heater into an electrical outlet until it is placed inside the aquarium.
• Please read all label information upon delivery
• No adjustment is requried.
• The HT heater is fully submersbile and can be installed vertically or horizontally
• The HT20 uses a built in electronic theromstat to automatically maintain water at 78° F which is ideal for most tropical fish
• All Tetra HT heaters have indicator lights to let you know when the heater is on
• It will be red when heating and green when the proper temperature has been reached.
• Ideal for aquariums between 10 to 30 gallons with hoods or glass canopies
• It's small footprint makes it easy to conceal behind plants or other décor.

By Orlushy

• Precise temperature dial from 68 to 89°F allows for complete control of aquatic climate within a 1-degree difference.
• Explosion Proof: 2mm thickened quartz glass,can be used in fresh water and salt water aquariums,easy to hide in the tank.
• Automatic shut off when the temperature is reached
• It shows an area to adjust the temperature
• Adjustable Aquarium Fish Tank Water Heater Sensitive and reliable thermostat maintains uniform temperature
• It's not exactly accurate but it turns easy and can be adjusted at small intervals
• 100W aquarium heater is suitable for 10 to 20 gallons aquariums,Length – 9″,voltage 110-120V, power cord is 6ft, please choose the right wattage aquarium heater according to our size chart.

By HiTauing

• Rapid Heating and Two Temperature Control System300W 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
• Intelligent Water Sensor and Over Temperature ProtectionThis 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.
• Accurate External Digital Display ControllerThe external IC temp controller of this aquarium water heater can show the water temp with 2 red LED digits
• It can maintain the freshness of fish
• You can press and hold the button next to the controller for 2-3 seconds to switch.
• The temperature in Fahrenheit and Celsius is displayed, which can be switched by pressing and holding the button for a few seconds
• It has a built-in temperature control system of Fahrenheit and Celsius(Temp range: 63-94℉/17-34℃)
• And the stronger black shell is a high temperature resistant ABS material which protect the fish, your aquatic organisms and you from scalding.
• 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.
• 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.
• They are also suitable for places where aquatic life such as fish tanks, aquariums, and small fish ponds are kept
• Explosion-proof Quartz Glass Aquarium HeaterThe 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
• The fish market is a common place for us
• Wide Range of UseThis 300 watt adjustable aquarium heater is suitable for many occasions

By hygger

• When the water temp cool down to 93℉, the heater will start working automatically
• HIGH-QUALITY MATERIALS: Built-in dual temperature probe, real-time monitoring of water temperature, temperature accuracy of ± 1 °F; high temperature resistant ABS material, no deformation and no softening, explosion-proof and anti-corrosion, no leakage of electricity
• Strong suction cup bracket, can stably fix the heater in every corner of the fish tank.
• ② 4 kinds of work instructions – Working/Malfunction/ Thermostatic/ Out of water, easy to understand
• In addition, it has a power-off memory function and no need to set it again.
• Automatically reduces power when approaching the set temperature, fully utilizes thermal energy inertia to smoothly reach the set temperature, saving energy.
• When the heating rod is completely immersed in water, it will start working automatically
• INTELLIGENT THERMOSTAT: Over-temperature protection prevents "cooking fish"
• ③ Upgrade the buttons to increase the sense of touch, and the operation is simple and easy, just cycle the buttons.
• When the water temp exceeds about 93.5 °F, start alternately flashing EE fault code; and over 97℉, the heater will stop heating automatically
• LED DIGITAL DISPLAY CONTROLLER: ① Displays real-time water temperature or set temperature, three-digit display, water temperature display accurate to 0.1 °F, easy to read
• ANTI-DRY PROTECTION: When the heating rod is exposed to air, display ER fault code and the heater will shut off automatically
• RAPID HEATING: Fastest 5 seconds warming, the internal material is updated and upgraded, using titanium steel material, which is safer to use, not easy to deform, and has very strong corrosion resistance
• Effectively extend the service life.

By AQQA

• Memory Function,Dry Burning-resistant ProtectionController with memory function,If power is shut off,the heater will keep the temperature settings until it powers on again,no need to worry about pets when you going out.When the heating rod is 5cm above the water surface, the heating rod will automatically power off, and the controller will display "E1"
• Temperatures Ranges 59℉ to 93℉,Automatic HeatingThe heating rod built-in thermometer,When the water temperature is lower than the set temperature by 1℉, the heater will automatically heat up, and stop heating when the water temperature is consistent with the set temperature.Fahrenheit and Celsius can be converted to each other,Pressing and holding for 5 seconds changes temperature display from Celsius to Fahrenheit.
• Explosion-proof Quartz Glass Aquarium Heater Durable and SaferThe heater 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 long lasting.2 hours heating 1℃.The shell is a high temperature resistant PC material, which can effectively protect the fish from scalding.
• The installation is very simple and no tools are needed.The size of the hook can be adjusted according to the thickness of the fish tank，Very safe and reliable.AQQA products enjoy a one-year warranty, please rest assured to buy.
• When submerged in the water again, the heater will automatically return to normal, no need to unplug the power or reset the controller.
• LED External Controller with Indicator LightThe controller is not waterproof, please keep away from water，LED digital display screen shows the current water temperature and preset temperature.The number above the controller is the current water temperature, and the number below is the set temperature,Red light means heating,Blue lights indicate constant temperature,blue light flashing indicates the heater not fully submersibled.
• Controller Can Be Installed with Adjustable HooksA hook can be installed on the back of the controller to hang on the fish tank

By Fluval

• Equipped with a slim profile mounting bracket and colored display alert system
• Aquarium heater with dual temperature sensors provide accurate and real-time water temperatures
• LCD temperature display available in both Fahrenheit and Celsius; with a range of 68 to 93 degrees Fahrenheit
• Fast heat technology built with a safety shut-off and integrated fish guard to protect fish and invertebrates

By PULACO

• Note: Do not operate or leave product plugged in when your water tank is out of water, heater should be fully submerged into water
• 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.
• Betta HeaterThis 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.
• 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
• 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
• SATISFACTION GUARANTEEDOur Aquarium Heater is built with durability in mind and safety for every design
• It is better to install a water pump to help water circulating while heating.
• 12 Month Warranty and 24 Hour Professional After-sales Service.

By hygger

• Fully SubmergedThe heater tube and the separate sensitive thermometer must be completely submerged under water all the time
• Quickly Heat UpVoltage 110-120V/60HZ, power 300W, US three-pin plug, heater rod length 7.7 inch
• When the water temp is cool down to 1℉ less than the set temp, the tank heater will restart heating
• Led Display ControllerOnly show Fahrenheit degrees
• With low profile black plastic guard, easy to hide in the tank
• It will stop heating when the water temp reaches to the set temp, please note that the water temp may go up 1℉ more because of the waste heat
• For long Time UseVery durable and explosion-proof aquarium heater, can be used for saltwater and freshwater aquariums, service life can be 3 years or more
• Fast heating up aquarium heater, it takes about 3 minutes to heat 3.5 gallon water up 3℉
• Please unplug it and wait it to cool down before you removing the heater or doing water change
• Auto on and off Reliable submersible aquarium heater
• To set the temp, just press the button over and over until the screen displaying the temp you desired, then stop and wait the digit flashing for 3 times, the setting is done and the led shows the current water temp again

By FREESEA

• Temperature range: 59°F~94°F, display Fahrenheit °F, this heater is designed for1~10 gallons tank.
• 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.
• 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.
• SATISFACTION GUARANTEEDGain 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.

By hygger

• Auto Shut Off When Overheating or Not Fully Submergedwith built-in thermometer and waterline detector, when the water temp is over 97F, the controller will auto shut off to prevent overheating, when the top of heating element is out of water over 0.8 inch, the controller will auto shut off and stop heating and will automatically restart heating after you place the heater fully under water
• The aquarium heater comes with a sturdy clip, there are 2 strong suction cups on the clip, easy to install the heater on to the fish tank wall
• When you want to check the water temp, you can see that on the heater or the controller display, the digits are synchronized updated
• Fully Automatic Smart Thermostat it's very easy to set the temp on the controller, just press the set button to choose the temp digits from 70℉ to 94℉, only integer value can be chose
• The heating mode is MAX heating when the set temp is 1℉or more higher than water temp, it will be ECO heating when water temp is 0.5-1℉ less than the set temp
• The fish tank heater can be placed horizontally or vertically, but must be fully submerged underwater
• Suitable for Fresh Water & Marine Waterdurable black titanium steel heating element, covered by sturdy plastic guard, service life can last for 3 years or more
• Dual Digital Displays on Controller & Heaterthe digit display on the heater is to show the current water temp, the controller digit display will show the current water temp and the set temp
• Energy Saving Heater for Aquarium Larger than 60 Galvoltage 110-120V/60HZ, power 800W, US three-pin plug, heater length 9.6 inch
• Fast heating up aquarium heater, it takes about 2 minutes to heat 3.5 gallon water up 3℉
• The heater power cord and the controller cord are both 5ft
• The heater will stop heating when the water temp reaches the set temp, and it will restart heating when the water temp is 0.5℉ lower than the set temp
• With 2 heating modes: MAX heating, ECO heating, more energy saving than general high power heater
• Can be used for fresh-water and salt-water fish tanks
• 800W aquarium heater for fish tank 120-180 gallon

By Eheim

• On/Off indicator light for at-a-glance monitoring.
• Made of shock resistant and shatter proof glass for fresh or marine water.
• Fully submersible, will automatically turn off when water level dips too low.
• Thermo safey control protects against running dry.
• Size of Heater is 20" X 1.4" Diameter
• Heater is meant for Tanks between 159-264 Gallons.

By Tetra

• The HT10 uses a built in electronic theromstat to automatically maintain water at 78° F which is ideal for most tropical fish
• All Tetra HT heaters have indicator lights to let you know when the heater is on
• Please read all label information upon delivery
• No adjustment is requried.
• It will be red when heating and green when the proper temperature has been reached.
• DO NOT plug heater into an electrical outlet until it is placed inside the aquarium.
• It's small footprint makes it easy to conceal behind plants or other décor.
• The HT heater is fully submersbile and can be installed vertically or horizontally
• Ideal for aquariums between 2 to 10 gallons with hoods or glass canopies

By BOEESPAT

• Small Aquarium Heater with External ControllerYou can set the temperature outside the fish tank through the external controller, and the fish tank accessories of temperature sensing built in will cyclic heating the tank water automatically .Temp range from 65℉ to 93℉
• Every time you set your betta fish heater, just press the button over and over until it reaches to your desired temp, then stop and wait the digit flashing for 3 times, then setting is done
• The heater with a built-in thermometer, when temp setting is done, the led will show the water temp all the time
• Digital DisplayWith led display on the midle of the betta heater front side, when the fish tank heater is heating, there indicator light above the digit is on red, when it stop heating, the light is blue
• Reliable ThermostatThis heater for fish tank also can as an ideal turtle tank heater（because it can adapt to water level as low as 1.6inch) after finishing the temp setting, it will maintain the tank water at the temp you set
• The led will display the set temp digit only when you press the controller
• Shut off When Out of WaterBOEESPAT aquarium heater adopt newest technology, it is a fully submersible aquarium heater for fresh water and saltwater tank, when the top part of betta fish heater is out of water it will be forcibly stopped
• With 2 strong suction cups at the back side of the betta heater, it's easy to install it on to glass, acrylic or plastic tank
• 50W tank heater is for 3-10gallon, 100W tank heater is for 10-20 gallon
• The tank heater will stop heating when the water temp reaches to set temp, it will restart to heating when the water temp is 1℉ off the set temp
• The power cord is 5ft, long enough for use indoors
• 50W Compact Fish Heater110-120V/60HZ square shape design small aquarium heater, fast heating for small fish tank
• After putting it in the water again, the fault disappears and normal operation resumes.It is a safe and reliable water heater tank

By Aqueon

• Ideal for aquariums up to 30 gallons
• Fully submersible, auto shut-off when overheats, resets when cools down
• LED light turns on when aquarium water is being heated
• Preset to 78°, accurate to +/- 1°
• Shatter resistant
• No adjustment required

By FREESEA

• 12 Month Warranty and 24 Hour Professional After-sales Service.
• Heater rod is suitable for people over 16 years of age
• Furthermore, Automatic safety shut-off feature, and overheating protection.
• 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
• 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
• Note: 1
• 25 Watt Heater： This Aquarium heater is suitable for 1 to 5 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.
• Children or minors should be under adult guidance or supervision.
• 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

By HiTauing

• Digital LED Display ControllerThe external IC temp controller of the fish tank heater can show the water temp with 2 red LED digits
• And the stronger black protective container is scald-preventing for your aquatic organisms and your safety.
• Explosion-proof Quartz MaterialThe submersible aquarium heater is made of high-quality quartz glass tube, it's very durable and explosion-proof, this fish tank heater can be used for saltwater and freshwater aquariums, which is pretty shatter-proof and blast-proof and prevents electricity leakage
• 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.
• It can maintain the freshness of fish
• Rapid Heating SystemThe voltage of this fish tank heater is 100-120V/50-60HZ, power 300W, Universal two-pin plug, heater rod length 12.99 inch, power cord is 98.5 inches long, 300W submersible heater for fish tank 26-66 gallon, Temp range: 63-94℉/17-34℃
• Intelligent Water Sensor and Over Temperature ProtectionThis aquarium 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.
• The heating tube can conduct heat quickly and fully contact with water to achieve rapid heating effect.
• The fish market is a common place for us
• Wide Range of UseThis 300W aquarium heater is suitable for many occasions
• 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.
• They are also suitable for places where aquatic life such as fish tanks, aquariums, and small fish ponds are kept
• The temperature in Fahrenheit and Celsius is displayed, which can be switched by pressing and holding the button for a few seconds

By VIVOSUN

• Safety Guarantee: Made with IP68, the highest waterproof level, and a titanium tube that features explosion-proof and anti-corrosion engineering, which makes this submersible fish tank heater more resistant to damage and heat while heating better than traditional glass heaters; It's built with overheat and water shortage protections built in
• External Temperature Controller: The touch-button controller adjusts the temperature without getting your hands wet; It's easy to control the temp from 68℉/20°C to 94℉/34°C; Check the size chart to find your desired fish tank heater
• Precise Temperature Control: An intelligent IC chip controls the heater's temperature, keeping the temperature difference within ±1℃/±2ºF; It provides the best living environment for your aquatic creatures
• Easy to Setup: The 300W submersible heater is suitable for 31.7- to 66-gallons aquariums; Install it vertically or horizontally and ensure the device is fully submerged under the water
• Wide Compatibility: The fish tank aquarium heater has CE, FCC, and ROHS certification and the plug has a UL certification; It's compatible with freshwater and marine aquariums, aquaculture, glass containers, and hydroponic systems

By hygger

• ️[500 Watt Aquarium Heater]️ voltage 110-120V, suitable for tank capactiy 60-120 gallon freshwater and saltwater aquariums
• Temperature can be precisely adjusted from 61 to 90°F (16°C ~ 32°C)
• Temp accuracy is +/- 1°F.
• ️[Made with Premium Quartz] ️ and double sealed by black protective guard this fish tank heater is resistant to explosion and corrosion, and protect fish and other livestocks from punching and scalding
• Just press set button to desired temperature, it blinks 3 seconds and begins to work
• Heat indicator lights on red when fish heater start to heat and turns in yellow once it reach set temperature
• ️[Over Heat Protection]️ This fully submersible aquarium heater enables memory function and over heat protection
• ️[Build-in External IC Temp Controller] ️easy to read blue LED digital number shows real time water temperature
• Auto shut off when over-heats, resets when it cools down.
• ️[Easy to Set Temperature ] ️without getting hands wet

By BOEESPAT

• We also deliberately give each customer a free diving thermometer with temp display, you can observe the water temperature of the aquarium at any time.
• Only 100% Submersible Use: 1
• SATISFACTION GUARANTEED: 12 Month Warranty and 24 Hour Professional After-sales Service! 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 water tank heaterr replacement.
• 300 Watt Water Heater: This Aquarium heaters is suitable for 40 to 60 gallons fish tanks, length 10.24″, voltage 110-120V, power cord is 55.1″, temperature range between 59°F~95°F
• The heater has an indicator light for current.
• 300 watt aquarium heater is suitable for people over 16 years of age
• Please unplug the power supply when cleaning the fish tank or aquarium water changes
• Intelligent Temperature Control: When water temperature reaches to specified temperature value, water heater will automatically stop heating, when water temperature is lower than the set temperature, turtle tank heater will automatically start heating
• Children or minors use it should be under adult guidance or supervision.
• Besides, the thick heatproof cover will also prevent your little fishes from scalding.
• More Safety Guarantee: Durable black titanium steel heating element, covered by sturdy plastic guard, service life can last for 2 years or more,which features explosion-proof and anti-corrosion during heating
• During its heating time, submersible water heater must be full submerged into the water
• Furthermore, automatic safety shut-off feature, and overheating protection

By VIVOSUN

• Easy to Setup: The 500W submersible heater is suitable for 39.6- to 92.5-gallons aquariums; Install it vertically or horizontally and ensure the device is fully submerged under the water
• Wide Compatibility: The fish tank aquarium heater has CE, FCC, and ROHS certification and the plug has a UL certification; It's compatible with freshwater and marine aquariums, aquaculture, glass containers, and hydroponic systems
• Titanium Aquarium Heater: Made with IP68, the highest waterproof level, and a titanium tube material that features explosion-proof and anti-corrosion engineering, which makes this submersible heater more resistant to damage while heating better than traditional glass heaters; Built with overheat and water shortage protection
• Precise Temperature Control: An intelligent IC chip controls the heater's temperature, keeping the temperature difference within ±1℃/±2ºF; It provides the best living environment for your aquatic creatures
• External Temperature Controller: The touch-button controller adjusts the temperature without getting your hands wet; It's easy to control the temp from 68℉/20°C to 94℉/34°C; Check the size chart to find your desired fish tank heater

Related Posts :

By Aqueon

• Fully submersible; Auto Shut-Off when over-heats, resets when it cools down
• Shatterproof and nearly indestructible
• For fresh and saltwater aquariums
• Recommended for aquariums up to 100 Gallons
• Includes suction cups for installation and placement
• LED light is red when actively heating
• Adjustable heat setting 68 to 88°F, Electronic Thermostat accurate to +/- 1°

By DaToo

• Select DaToo Aquarium Heater, Let us care about your fish starting from the temperature.
• Adjustable Temperature – Only need turn the knob on the top of the DaToo aquarium heater, You can easily get the temperature you want（68 to 93°F) and you can read the temperature you set by the dial of the aquarium heater
• The shell of the DaToo Aquarium Heater is made with Shatterproof, Corrosion resistant, Wear-resistant microcrystalline glass(glass-ceramics), can be used in fresh water and salt water.The heating part is made of nickel-chromium alloy, ensure superior heat transfer and enhanced service life
• Attention – This is 50W DaToo Aquarium Heater, 6.7inch, fit 2 to 10 gallons tank with hoods or glass canopies and keep the water flowing( This is very important).Please confirm these details before purchase
• Thermostat system to ensure that your beloved fish can be happy and comfortable life
• Stepwise heating mode, it will automatically turn on and off to keep your set temperature, reduce electricity consumption
• No suitable temperature, our fish will not survive healthy
• Select DaToo Products= Own A Private Aquarium Housekeeper.
• Select DaToo Aquarium Heater, Let it serve your fish forever..
• The DaToo Submersible Aquarium Heater is a system that create a warm and comfortable living environment for your lovely fish
• DaToo 50W Aquarium Heater – How to make our beloved fish live in a comfortable environment? This is a matter of concern
• The process of heating does not produce invisible toxins
• Select DaToo Aquarium Heater, not only care about your fish, but also save electricity fee for you.
• BPA Free And Energy Saving – Every plastic component of the DaToo Aquarium Heater is made with durable, high-quality, BPA-free plastic
• Sturdy And Durable – Still worried about the heater will be broken?Now let's say goodbye to this worry
• This means it is safe not only for your fishes, but for you as well

By SZELAM

• Top Quality Material Brings More Safety Guarantee. Made of thick quartz tube heating rod, with black grit and thick ABS black cover, which features explosion-proof and anti-corrosion during heating
• The external temp controller brings you more convenient and safe to adjust the set temp externally.
• Built with Overheat and Water Shortage Protection. This submersible aquarium heater is more sensitive and intelligent to resist overheat and water shortage than traditional glass heaters and it is automatically power off when taken out from water.
• External Temperature Controller with Dual Temp Displays. With dual LED digital displays, you can observe water temp and set temp of fresh or marine water at the same time
• Super Easy to Setup with Wide Compatibility. This 500W submersible heater is suitable for 79 to 120 gallons fish tank and the power cord and plug have UL certification, which has more safety guarantee while heating
• Precise Temperature Control with Temp Probe. Our aquarium heater has sensitive temp probe, which is more precise to control the heater temp, making the temp difference within ±1℉ and providing the suitable living environment for your aquatic creatures.
• Besides, the thick heatproof cover will also prevent your little fishes from scalding.
• It is applied for freshwater and marine aquariums, aquaculture, glass containers, and hydroponic systems.

By Fluval

• Fast heat technology built with a safety shut-off and integrated fish guard to protect fish and invertebrates
• Equipped with a slim profile mounting bracket and colored display alert system
• LCD temperature display available in both Fahrenheit and Celsius; with a range of 68 to 93 degrees Fahrenheit
• Aquarium heater with dual temperature sensors provide accurate and real-time water temperatures

By hygger

• Indicator light let you know when the heater is on
• {FOR 120-180 GAL} 800 watt aquarium heater, voltage 110-120 Volts, heater rod 9.6 inches long, suitable for tank capacity 120-180 gallon freshwater and saltwater aquariums
• It will cycle through all the set temperatures
• {SHATTERPROOF CORROSION RESISTANT} Corrosion resistant, shatterproof titanium tube construct heats fast, nealy unbreakable for both saltwater and freshwater aquariums
• {EASY TO USE} Easy to set temperature without getting hands wet
• The heater will shut off when removed from the water, and resume functioning upon return
• Just keep pushing the button
• Temperature can be precisely adjusted from 68 to 93°F (20°C ~ 34°C), electronic thermostat accurate to +/- 2 degrees Fahrenheit differences
• { RUNNING DRY & OVER-HEAT PROTECTION } This fully submersible fish tank heater maintains proper temperature for your fish in a safety way, auto shut off when over-heats, resets when it cools down
• ABS plastic protective sleeve prevents fish from being scald
• {EASY TO READ LCD DISPLAY} Build-in external temp controller, easy to read LED digital number shows real time water temperature and set temperature
• It will be red when heating and green when the proper temperature has been reached

By hygger

• 50W tank heater is for 1-6.5gallon, 100W tank heater is for 6.5-13 gallon
• Keep the controller away from water, it's not waterproof
• The heater with a built-in thermometer, when temp setting is done, the led will show the water temp all the time
• The tank heater will stop heating when the water temp reaches to set temp, it will restart to heating when the water temp is 1℉ off the set temp
• Reliable Thermostatthis an automatic aquarium thermostat, after finishing the temp setting, you can be confidence on that it will maintain the tank water at the temp you set
• The led will display the set temp digit only when you press the controller
• Digital Displaywith led display on the midle of the heater front side, when the fish tank heater is heating, there indicator light above the digit is on red, when it stop heating, the light is off
• With 2 strong suction cups at the back side of the betta heater, it's easy to install it on to glass, acrylic or plastic tank
• If the water temp is over 95℉, the heater will auto shut off and led displaying HH, it will work normally again when the water temp is lower than 95℉
• Compact Small Heater110-120V/60HZ oval shape design little aquarium heater, fast heating for small fish tank
• External Controllereasy to set the temp on the controller, only show farenheit temp, you can set the temp range from 63℉ to 94℉, temp accuracy 1℉
• Every time you set the temp, just press the button over and over until it reaches to your desired temp, then stop and wait the digit flashing for 3 times, then setting is done
• Heater Dimension: 2.7×1.4x 4.5 inch
• Shut off When Out of Waterplease note that this a fully submersible aquarium heater for fresh water and saltwater tank, when the top part of the heater is out of water it will auto shut off and the led displaying E1, when fully in water again it will return to normal work again
• The power cord is 5ft, long enough for use indoors

By hygger

• 500 watt aquarium heater, voltage 110-120V, suitable for tank capactiy 60-120 gallon freshwater and saltwater aquariums
• This fully submersible aquarium heater enables memory function and over heat protection
• Temperature can be precisely adjusted from 70 to 94°F
• Easy to set temperature without getting hands wet
• Build in hand button, Keep pushing the button
• Made with premium titanium and double sealed by black protective guard, this fish tank heater is resistant to explosion and corrosion, and protect fish and other livestocks from punching and scalding
• Temp accuracy is +/- 1°F.
• It will cycle through all the set temperatures
• Build-in external IC temp controller, easy to read LED digital number shows real time water temperature
• Auto shut off when over-heats, resets when it cools down

By EcoSmart

• Manufactured in China
• The product is highly durable
• Heating elements are durable and are threaded for easy replacement
• Activation Flow – 0.3 GPM
• The product is easy to use

By Koehler