14 best aquarium heaters

• ★【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.
• ★【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.

User questions & answers

Question:	Can I use a short extension cord with this 25 watt heater because the port is so short
Answer:	All of my fish tank items are connected to a surge protected extension cord. This heater is one of the items plugged into it.
Question:	Does this heater come with suction cups
Answer:	Yes
Question:	Are their any directions to put the heater in
Answer:	They have directions right on the side of the box when it ships. Pretty much the heater has to be fully submerged
Question:	Has anyone else experienced condensation in the display? it makes it very hard to read. does anyone know how i can stop this from happening
Answer:	Move the display further from the aquarium

Product features

FREESEA Aquarium Submersible Heater

• 1.Temperature range: 63°F~95°F , It is very easy to adjust the temperature you need.
• 2.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.

100% is submersible heater, and it should be installed on the inner side of fish tank.

100% is submersible heater, and it should be installed on the bottom of fish tank.

The water level of fish tank cannot very low, as it is easy for heater to exposed on water.

It is forbid for exposing some main body part of heater on water when using.

Product description

U-picks Submersible Aquarium Heater 500W



FEATURES:

1.Made of thicker quartz, this heater is shatter-proof and blast-proof.

2.The heater cover is compact designed, which is heat resistant that will protect you little fish from scalding.

3.With dual temperature displays, you can easily set and read the temperature at the same time.

4.Smart heating, provide stable water temperature for your beloved fish.



WHAT YOU GET:

1* 100W Aquarium Heater with Heater Protector

1* External Temp Controller

2* Suckers (for Heater)

2* Fixing Tools (for controller)

1* User Manual

1* Package Box



NOTES:

1. For your safety and the best purchase experience, please carefully read and follow the instructions, and contact immediately if there is any issue.

2. The whole body of heater must be fully submerged under water during working, but not buried in sand or mud.

3. The controller must be NEVER placed in water.

4. Before installing heater, please cut off all the devices in the aquarium.

5. Unplug the heater and wait for AT LEAST 15 minutes to let it cool down before you remove it.

6. It’s better to install the heater near where the water flow is strong to make the entire aquarium in the same temp.

7. Please DO NOT use it if the wire or heater damaged.

• [Fully Submersible Aquarium Heater]---Voltage 110-120V/60HZ, power 500 watt, heater rod length 10.8 inches, suitable for aquarium/fish/turtle/betta tank 80-130 gallon. The controller power cord is 47 inches, The heater power cord is 67 inches and the temperature control range from 68~93°F.
• [Smart Heating]---When the water temperature is lower than the set temperature (red indicator), the fish heater starts to work until the water temperature reaches the set temperature (blue indicator). It can always provide stable water temperature for your beloved fish.
• [External Controller]---This 500W submersible heater is adjusted by an external controller, which you can mount on the outside edge of the tank. It’s convenient and safe for you to set the temperature, no need to take the heater out from water and risk burning yourself.
• [Dual Temp Displays]---With dual accurate LED digital temperature displays, you can read & set the water temperature at the same time. It is very easy and convenient for you to recognize and observe the temp change in real time even in the night!
• [High Quality Material]---Made of thicker quartz, this heater is shatter-proof and blast-proof. The heater cover is compact designed, which is heat resistant that will protect you little fish from scalding. Strong suction cup bracket help stably fix the heater in every corner of the fish tank.

User questions & answers

Question:	How do I turn of the annoying beeping
Answer:	When the led display shows hh, it means the temperature of the water excess 36 degree, which is too hot to the aquarium, it is best to power off the heater and wait for 15mins. Then plug the heater and reset the heating temp.
Question:	What does E1 error code mean with this unit? It's not listed in the manual
Answer:	I am not 100%sure. I found one site that said it is due to not being completely submerged. Check that and see if that might be the issue. If that is not it, I do not know what the code would be.
Question:	How do you turn the heater temperature down? I need to change the temp and it only goes up
Answer:	Keep going up until it cycles through and begins over. Then stop at the temp you wznt
Question:	Mine is reading hh but the water isn’t that hot, will it reset and work again or is it broken and do i need to get a new heater? it’s only 1 month old
Answer:	When the led display shows hh, it means the temperature of the water excess 36 degree, which is too hot to the aquarium, it is best to power off the heater and wait for 15mins. Then plug the heater again to reset the heating temp.

• PRECISE TEMPERATURE CONTROL: An intelligent IC chip controls the heater temperature, making the temperature difference within ±1℃/±2ºF; Provide the best living environment for your aquatic creatures
• SAFETY GUARANTEE: 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
• 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
• EASY TO SETUP: 300W submersible heater is suitable for 31.7 to 66 gallons aquariums; Vertical or horizontal installation and ensure the device is fully submerged underwater
• WIDE COMPATIBILITY: The fish tank aquarium heater has CE, FCC and ROHS certification and the plug has a UL certification; Applicable for freshwater and marine aquariums, aquaculture, glass containers, and hydroponic systems

User questions & answers

Question:	did anyone else almost boil there fish alive with this product? sopped working correctly after 4 months
Answer:	Firstly,you need to set the temperature.If you set at 78,if the water in the tank is lower than the setting,the heater will be heated, the red light is on. After heating,the water in the tank up to the temperature of the setting,the heater won’t heat up, the red light is off. So don't worry about the light shock. If there is any problem,feel free to contact me .
Question:	Can the temperature be displayed in Fahrenheit
Answer:	I think its supposed to stay on
Question:	How do i claim warranty? 300 watt heater failed at 11 months. This has killed several saltwater fish
Answer:	I don't see any issue of mounting this unit in a circular shaped tank. One major issue is to make sure that the unit is totally submerged preventing it from burning out. There is a line on it stating it must be below water. Do this... and it will last.
Question:	I have this heater for a few months and know it blinking e7 how do i fix it
Answer:	The aquarium heater 50W is about 9.5 inch long.Hope this helps you.

Product features

VIVOSUN aquarium heater for cold blooded creatures

VIVOSUN submersible aquarium heaters are more efficient, and the heating unit is completely submerged in the water, providing more consistent heating to the aquarium.

Features:

Intelligent Indicator Light

Red Light Water temperature is below set range, heating function will engage and increase temperature automatically

Blue Light Water temperature is within desired set range, monitoring function is engaged

2 stable suction cup angles

The 2 suction cups attached can suck the heating rod on the fish tank wall

Set the Temperature Conveniently

• Press set button to start the temperature setting. The LED display will start to flash, continue pressing set button, the number in LED screen will circulate from 68 to 94 °F
• Press SET for 5 seconds for switching between Fahrenheit and Celsius

• 【Energy Saving Heater for Aquarium Over 60 Gal】voltage 110-120V/60HZ, power 800W, US three-pin plug, heater length 9.6 inch. The heater power cord and the controller cord are both 5ft. 800W aquarium heater for fish tank 120-180 gallon. Fast heating up aquarium heater, it takes about 2 minutes to heat 3.5 gallon water up 3℉. With 2 heating modes: MAX heating, ECO heating, more energy saving than general high power heater
• 【Auto Shut Off When Overheating or Not Fully Submerged】with 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
• 【Dual Digital Displays on Controller & Heater】the 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. 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 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. 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
• 【Suitable for Fresh Water & Marine Water】durable black titanium steel heating element, covered by sturdy plastic guard, service life can last for 3 years or more. Can be used for fresh-water and salt-water fish tanks. 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. The fish tank heater can be placed horizontally or vertically, but must be fully submerged under water

User questions & answers

Question:	I have a 125 gallon fish tank, which size should I choose
Answer:	Hi, as the weather getting colder, I would suggest the 800W heater for your 125 gallon tank.
Question:	What is the warranty for this heater
Answer:	I really don’t know but I haven’t had one that has made it beyond a month. Amazon is always good to either replace or refund. I am using two in a 55 gallon sump that services my 150 gallon tank. The heaters are never touched or moved around so they get very little handling.
Question:	My heater this morning keeps reading er when fully submerged. how can i fix this
Answer:	Not sure go back to the instructions read what it says about err,I know it has to be fully submerged otherwise you will get that message.
Question:	Hello i bought one sent it back because the controller screen went black, replacemnt same thing, now whay
Answer:	They didn't put a means of resetting the light. In order to read the display, you'll need to unplug it then plug it back in to reset the timer. Timer is on about 12-14 hours.

Product features

2 size available:

Heater rod dimension:

500W: 7.9 x 3 x 1.1 inch

800W: 9.6 x 3 x 1.1 inch

Controller dimension: 5.7x3.2x1.1 inch

Fish tank size:

500W for fish tank 60-120 gallon

800W for fish tank 120-180 gallon

2 heating modes shfit automaticlly

1. MAX heating mode

It means fast heating at full power, when heater is first time to heat or when the water temp drops 1℉ or more lower than the set temp. For example, the water temp is 77.5F, at first time heating, no matteryou set the temp to 78F or 81F, the heater will heating in this mode to heat up quickly.

2. ECO heating mode

It means slow heating to save energy, it only work when the water temp drops off 0.51℉-1℉ than the set temp, for example the set temp is 78℉, after 2 hours the water temp drop off to 77.2℉, the heater will heating in this mode.

Error code- Er

1. Auto shut off when out of water

If you see the error code "Er" on the controller and the heater display, it means the heater is not well installed fully under water, it will auto shut off.

In this case, please place the heater fully submerged in water, we suggest 2 inch below the water surface at least.

2. Auto recover work when fully under water

The heater will automatically work normally after you placing the heater fully under water.

Error code-EH

1. Auto shut off when water temp over 97℉

If you see the error code "EH" on the controller and the heater display, it means the water temp is too hot, it will auto shut off, but the wast heat of it may make the water temp go up for a little more.

In this case, please wait the water to cool down or you can aad some water into the fish tank.

2. Auto recover work when water temp drops below set temp

Please note the controller is locked during this period.

Comes with a detachable suction cup clip

The plastic clip is specially designed for the heater rod, it's very sturdy for use. It can be easily slipped in or out the heater rod.

There are 2 strong suction cups in the clip, and these can be removed if you want to replace the suction cups.

Stop heating indicator light

There is an indicator light on the heater, it will turn on green when the water temp reaches to the set temp.

The heater has a built-in thermometer to detect the water temp.

Heating indicator light

When the heater is heating, the indicator light will turn on red.

The temp digit on the heater display is the current water temp.

• 【Quickly Heat Up】Voltage 110-120V/60HZ, power 300W, US three-pin plug, heater rod length 7.7 inch. Fast heating up aquarium heater, it takes about 3 minutes to heat 3.5 gallon water up 3℉
• 【Auto on and off 】Reliable submersible aquarium heater. 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. When the water temp is cool down to 1℉ less than the set temp, the tank heater will restart heating
• 【Fully Submerged】The heater tube and the separate sensitive thermometer must be completely submerged under water all the time. Please unplug it and wait it to cool down before you removing the heater or doing water change
• 【Led Display Controller】Only show Fahrenheit degrees. 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
• 【For long Time Use】Very durable and explosion-proof aquarium heater, can be used for saltwater and freshwater aquariums, service life can be 3 years or more. With low profile black plastic guard, easy to hide in the tank

Product description

Welcome to AQQA🐟🐟

AQQA is a professional shop specializing in aquarium supplies and accessories,all products from this store the actual filming of goods please rest assured that you purchasers to buy!

We are determined to provide better product and better services to our customers.Our customer service is online 24 hours, providing pre-sale, sale, after-sale service, the product implements a free return policy, Free replacement within 3 months. If you have any questions, please feel free to contact us.

AQQA--Aquarium accessories,Quality Assurance



Product Description

Product Name:AQQA Aquarium Submersible Heater

Size:100W 200W 300W

Voltage:110V/60Hz

Cord length：4ft+5.9ft

Controller:External Controller（Not waterproof）

Temp Accuracy：±1℉

Suggest fish tank size:25-35gallon 45-80gallon 80-95gallon

Package included:1×heater with external controller 1×user manual 2×suction cups



The main function of heater

1.Automatic heating, intelligently stop heating when the set temperature is reached

2.Dry burning-resistant protection, 5cm away from the water surface, automatic power off

3.The current water temperature and the set temperature are displayed at the same time, without mutual interference, the current water temperature can be seen at any time

4.Memory function, when the power is off, the previous settings will be maintained without resetting. If the heater have been in the fish tank, it will automatically start running after the power is turned on. Follow the previous settings



What The Lights Mean

2.Red Light:The heater is heating

1.Blue Light:Constant temperature,the water temperature is at the set temperature value

3.Display shows"E1":Shut off automatically when the heater exposed to air,not fully submerged.



WARRANTY

1-year free warranty.



If you have any questions, please contact us, wish shopping happy

• 🔥【Explosion-proof Quartz Glass Aquarium Heater Durable and Safer】The 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.
• 🔥【Temperatures Ranges 68℉ to 93℉,Automatic Heating】The 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 Press and hold "+" and "-" at the same time, Fahrenheit and Celsius will be converted into each other after 5 seconds.
• 🔥【LED External Controller with Indicator Light】The controller is not waterproof, please keep away from water，LED digital display screen shows the current water temperature and preset temperature.The number the left on the controller is the current water temperature, and the number on the right is the set temperature,torch light and surrounding lights flicker means heating,torch light and surrounding lights not flicker indicate constant temperature.
• 🔥【Memory Function,Dry Burning-resistant Protection】Controller 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". When submerged in the water again, the heater will automatically return to normal, no need to unplug the power or reset the controller.
• 🔥【Controller Can Be Installed with Adjustable Hooks】A hook can be installed on the back of the controller to hang on the fish tank. 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.

User questions & answers

Question:	Would the 500w be ok in a 65 gallon tank that will be eventually used in a 125 gallon
Answer:	Hello,Yes,We recommend that it can be used between 66-135gallon, and 65 gallons can also be used.
Question:	How big is this controller
Answer:	Hello,the size of controller is 4.7"*2.8"(12*7cm), Ultra hd LED screen,Double display of temperature and setting temperature,You are welcome to buy and use.
Question:	Where is this heater made
Answer:	Hello,the heater made from china.
Question:	Can the 100 watt be used in a 20 gallon tank
Answer:	Hello, it can be used, please set the temperature lower, for safety.

• ★【200Watt Heater】: This Mini Aquarium Heater is suitable for 20 to 35 gallons aquariums, voltage 110-120V, power cord is 3.5 ft, please choose the right wattage aquarium heater according to our size chart.
• ★【Temperature Range】: 62°F~93°F , display Fahrenheit, It is very easy to adjust the temperature you need, touch button, cyclic adjust temperature , easy to use and safety.
• ★【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】: This Mini Aquarium 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.

Product features

The Greatest Advantage

Multi-function LED digital display heater: Use advanced IC technology,

Oval appearance, large LED display.

Clearly and accurately displays the water temperature,

highlights your aquarium.

No need to buy another thermometer.

The Most Safety Operation

How to adjust temperature:

There is a regulator connect with power cord, just press the button after heater has been installed,

and you can will see the LED display shows °F，

press the button until you see the display shows your expecting temperature (display 59~93℉ in cycle by),

and then leave it for heating up.

For example:

Expecting temperature is : 80℉ Heater display shows: 70℉ Then, Press the regulator 10 times,

then you will see the display shows from 70 to 80°F.

When you see the display shows 80°F，

then leave it for heating.

Advanced Waterproof

Highest waterproof level: IPX8

Built-in Temperature Control Chip

Built-in temperature control chip

External Touch Button

External Touch button, cyclic adjust temperature , easy to use and Safety.

Small Size

Heater Ideal for 1-10 gal fish tanks. Heater Size: 2.5 x 1.5 x3.5 inch

Product description

Mylivell Aquarium Heater Submersible Auto Thermostat Heater,Fish Tank Water Heater and Adjustable Temperature with Suction Cup

• 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: 50W. Suggested water volume: 20gal.
• 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.

User questions & answers

Question:	does it turn off when it is at the chosen temperature
Answer:	Around 4.5 inches
Question:	Is the black plastic bumper at the bottom supposed to stay on when using heater or is it supposed to be remover before turning heater on
Answer:	I've no idea how long it is advertised to last, but I've had mine for a couple of years now and it still works reliably.
Question:	Can i use this on a circular aquarium? Will the suction cups hold to a circular tank
Answer:	I don't know that's it's timed. However initially it will stay at a preset of 78 but later it will start to keep temps of 75-77 depending on what size tank it's in. Also the black paint will chip off. Mine did within a couple months. Not good for Saltwater. :)
Question:	What is the actual length of the 50W heater itself, not the cord
Answer:	Yes, it comes with 1 suction cup. Stay away from this product; spend a little bit more and buy one that has a lifetime warranty and you can set the temperature.

Product description

All 9 EHEIM Heater models are 100% fully submersible and come with a new TruTemp dial that allows the user to recalibrate the heater within a +/- 0.5F degree accurancy for precise temperature readings.

• 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

User questions & answers

Question:	How would this handle a ~200 gal tank outdoors where it can get into the 20's (F) occasionally
Answer:	It is digital can be set at 73
Question:	gallons heated
Answer:	Indeed, as described in the advertisement, it has two modes， cold and hot, with two speed wind speed. In summer, you can adjust it to natural wind, and you can remotely operate the temperature. How many degrees will it show on it, and it can also be adjusted. Its functions are very complete. The best thing is its 7-color night light. I think that's its feature. The night light is very beautiful and can be turned off when it is not needed. This is a good product It's worth buying. I hope my answer can help you
Question:	Heater is too long to sit vertical in my tank. Horizontal would be fine. It says it's fully submersible but I'm reading the opposite here. Any help
Answer:	Normally it makes a little noise, but it's very quiet compared to the smaller ceramic heater I bought two years ago. You can put the heater a little further away, which also makes it look quieter.
Question:	can anyone give me length of the heaters
Answer:	If you have any product problems, you can contact the seller directly, their service is not bad. When I encounter problems, I will contact the seller and they will reply to the email within 24 hours.

Product features

Eheim Jager TruTemp Submersible Heater

Precisely regulated, constant water temperature is very important for the comfort and success of your aquarium inhabitants. The Jäger TruTemp adjustable heater is an ultra-modern electronic thermal device offering today's best technology. Designed for use in both freshwater and saltwater aquarium, Jäger TruTemp fully-submersible heaters include these great features:

Shatterproof glass construction - Made with laboratory-grade glass, TruTemp heaters are free of pollutants, resistant to chemical and biological substances, and able to withstand extreme temperature fluctuations. Their glass jackets also enlarge the heating surface and ensure even heat distribution.

TruTemp Dial - Temperature can be precisely adjusted from 18° to 34° C (65° to 93° F). Using the TruTemp dial with readjustment ring, the user can recalibrate the heater for a precise temperature reading. Control accuracy is +/- 0.5° C.

Thermo Safety Control - This safety mechanism enables 'running-dry' protection. The heater will shut off when removed from the water, and resume functioning upon return.

On/Off Indicator Light - This convenient feature eliminates guessing and enables the user to verify heater function without getting their hands wet!

Each Jäger TruTemp Heater also includes a mounting bracket and suction cups for secure and flexible placement within your aquarium system. Lastly, an extra long power cord accommodates most applications.

Product description

🐳The best material protects you and your aquatic life:

①Quartz heating rod: high temperature resistance, corrosion resistance, good thermal stability, and good light transmission performance.

②PPS hard plastic: has excellent high temperature resistance, corrosion resistance, radiation resistance, flame retardant, balanced physical and mechanical properties, excellent dimensional stability and excellent electrical properties.

③Nickel-chromium wire: high strength at high temperature. After long-term use, it will be cooled down. The material will not become brittle. Fully oxidized nickel-chromium alloy has a higher emissivity than iron-chromium aluminum alloy. It is non-magnetic. In addition to sulfur atmosphere, Good corrosion resistance.

🐳How to use the temp setting?

Press the button on the controller over and over, the set temp digits will go circularly from 62℉ to 93℉, when you set it to the digit you want, stop and wait the led flashing for 4 times, then the setting is done and the led will go on displaying the water temp.

🐳How to switch between Fahrenheit and Celsius？

You only need to press and hold the temperature adjustment button on the LED thermostat to easily convert between Fahrenheit and Celsius. The facility temperature can be adjusted from 17-34 degrees Celsius, and the Fahrenheit temperature can be adjusted from 62-93 degrees Fahrenheit. The operation is very simple！

🐳Attention in use:

Before the aquarium heater is turned on, you need to completely submerge the heating rod in the water. The attached two super powerful suction cups can be firmly fixed on the side of the aquarium or at the bottom of the aquarium.

🐳After-sales service:

LUYS has a strong after-sales service team, if you have any questions or suggestions, please feel free to contact us!

• 🐠【Intelligent Water Sensor and Over Temperature Protection】This 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.
• 🐠【Explosion-proof Quartz Material】The 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. And the stronger black protective container is scald-preventing for your aquatic organisms and your safety.
• 🐠【Rapid Heating System】The voltage of this aquarium heater is 100-120V/50-60HZ, power 300W, Universal two-pin plug, heater rod length 12.99 inch, 300W submersible heater for fish tank 26-66 gallon, Temp range: 62-93℉. The heating tube can conduct heat quickly and fully contact with water to achieve rapid heating effect.
• 🐠【Digital LED Display Controller】the external IC temp controller of the fish tank 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 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.

User questions & answers

Question:	Can this heater be position horizontally
Answer:	Good day! Yes, it has two suction cups, you can place it horizontally at the bottom of the fish tank, hope this will help you!
Question:	I have a 60-gallon fish tank. should i choose a 300w or 500w heater
Answer:	A 60 gallon tank only requires at the most 300 watts
Question:	It can be use in a 120 pond outdoor
Answer:	Their specs say it can be used in a 120 gallon pond. I'd say it would depend on the circulation and how insulated the pond is. Also, the electronics would need to be in a weatherproof housing.
Question:	What happens if the power goes out and comes back on? Does it reset to 82F
Answer:	I read the instructions and features again and it does not mention anything about the temp we set being memorized. It just says it saves the temp when its set and that if the water reaches above 94 degrees it automatically goes back to 82. So I would say yes it goes back to 82 degrees. Which isnt too bad for my turtles but not sure about fish if someone isnt home to reset it again. Hope this helps.

• 【200 Watt Heater】This Aquarium heater is suitable for 25 to 60 gallons aquariums, Length - 11.9 inch,voltage 110-120V, power cord is 4.0 ft, please choose the right wattage aquarium heater according to your Aquarium.
• 【Premium Shatterproof Glass】Made of shatterproof glass and BPA-free plastic. Orangelight aquarium heaters are fully submersible and safe for fish without any toxic substance producing.
• 【Automatic Constant Temperature Function】This fish heater, adjustable temperature 68 ~ 93 °F, will shut off automatically when the temperature is reached, no extra adjustment is required.
• 【Fresh and Saltwater】Both suiting for fresh or saltwater aquariums, provide a constant warm environment for your tropical fish to stay healthy.
• 【Wide Compatibility】Applicable for freshwater and marine aquariums, aquaculture, glass containers, and hydroponic systems

User questions & answers

Question:	Length? Pic shows 10.5”, description says
Answer:	The length of this product is 10.5”，Sorry to trouble you due to the mistake, We will correct it asap. Thank you
Question:	so I just revived mine. I plugged it in and set it to the needed temp and it’s not working
Answer:	We are very sorry for the bad experience of your shopping, please contact our customer service staff, we will handle a free replacement or a full refund for you.
Question:	Works with acrylic tank
Answer:	It shouldn't be a problem. There's suction cups so it doesn't touch the tank.
Question:	If this is submersible, can it be mounted horizontal? I only have approximately 4 inches of depth, which would stop me from mounting vertical
Answer:	It can be mounted any way you want. It is fully submersible so yes. 😊 Works great too!

• ★【50Watt Heater】： This Aquarium heater is suitable for 5 to 15 gallons aquariums, Length - 6.0 inch,voltage 110-120V, power cord is 4.0 ft, please choose the right wattage aquarium heater according to our size chart.
• ★【Temperature Range】: 64°F~93°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.
• ★【High Quality】: This upgraded aquarium heater now updated for 2mm durable Quartz Glass, which is pretty shatter-proof and blast-proof and prevents electricity leakage. And the stronger protective container updated for Anti-melting anti punching double sealed material, it is scald-preventing for your pets and your safety, suitable both for fresh and salt 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.

User questions & answers

Question:	The temperature is not displaying on the thermometer. How do I turn it on
Answer:	Hi there. I have mine for a 40 gallon tank and it seems like enough light. I would think it should be sufficient for your 20 gallon tank.
Question:	Need a heater for a 10 gallon in house that is 60 degrees overnight. Will this maintain a fairly steady tank temperature
Answer:	The little "wall-wort" power supply will work with ether 110 OR 220 as will many switching power supplies. "Submerged into a pool?" The light bar; YES as it is fed 12 volts (class 2 low voltage) and appears to be pretty well sealed. The power supply: NO!!! High voltage and water together is what engineers refer to as a "BAD IDEA" and could change your plans for a future.
Question:	Can the aquarium heater be used outside
Answer:	As long as it is underwater it should work. Keep in mind that it is a bright light, I have mine pointed down. I do not think you would enjoy look directly at the LED.
Question:	Can it be used in a turtle tank
Answer:	Yes. It has an on and off switch. It works outside the tank

Product features

FREESEA Aquarium Submersible Heater

1.Temperature range: 64°F~93°F , It is very easy to adjust the temperature you need.

2.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.

100% is submersible heater, and it should be installed on the inner side of fish tank.

100% is submersible heater, and it should be installed on the bottom of fish tank.

It is forbid for exposing some main body part of heater on water when using.

The water level of fish tank cannot very low, as it is easy for heater to exposed on water.

Product description

Product Features:

1. 110V-120V/60HZ 6-foot power cord,

2. Fully submersible.

3. Universal heater for marine, freshwater or tropical aquariums

4.automatic safety shut-off feature, and overheating protection.



Available In:

Length - 9.5" 15-30 Gallons, 100 Watts

Length - 9.5" 30-50 Gallons, 150 Watts

Length - 11" 40-60 Gallons, 200 Watts

Length - 11" 50-80 Gallons, 300 Watts



Submersible Aquarium Heaters are made from thermal shatter-resistant quartz glass and were designed to absorb impacts, making them extremely durable.

A power indicator light turns on when the unit is heating, Can be positioned at a vertical or horizontal angle. Can be used in fresh or saltwater fish tanks. 6-Foot power cord.

• ★100W aquarium heater is suitable for 15 to 30 gallons aquariums,Length - 9",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

User questions & answers

Question:	How do you set up the thermometer
Answer:	just put the end in the tank and turn it on with the button and attach it to the outside of the tank
Question:	Could you use this to take the chill off in a atrium
Answer:	no, this must be completely under water and 150 watts is not going to have much impact on such a space.....better use 150 watt light bulb or more.
Question:	I have a hermit cab tank, can i used this for a tank that is not submerged in water
Answer:	I would NOT. It is meant to be in water, and I think it would get too hot without water to disperse the heat.
Question:	The included digital Thermometer did not include a battery. Does anyone know what # watch battery it requires
Answer:	No I forgot what type of battery it takes. My digital thermometer stop working. So I got a regular thermometer.

• 🐠【For Fish Tank 20-45 Gallon】voltage 110-120V, power 200W, heater rod length 10.7inch. The heater and controller power cords are the same length 5.5ft, the thermometer cord is 4.4ft. There are mounting holes on the temp controller back for hanging on the wall
• 🐠【Fully Automatic Control】very easy and reliable to use. After well installing the aquarium heater and the thermometer, you just need to set the desired heating temp, it will stop heating when the water temp reaches to the set temp, it will automatically restart heating when the water temp is 1℉ less than the set temp. The controller has temp setting remember function
• 🐠【Durable Titanium Tube】this seawater resistant titanium aquarium heater is good for use in salt water and fresh water, service life can be 3 years or more. Very compact small, easy to hide in the tank. Don't suggest to use it in sump. The diameter of the titanium tube is19mm, you can buy suction cups suitable for this size when you need to get that replaced.
• 🐠【Digital LED Display】the IC temp controller can show the water temp and set temp at the same time, and there is a indicator light to show the heating status. You can press the 'up' key to shift degree unit between Celsius and Fahrenheit
• 🐠【Wide Temperature Range】With the thermostat controller you can set the temp from 32℉to 104℉, control precision is 1℉, please set the right temp for your aquarium pets. The separate thermometer can detect a temperature from -68℉ to 140℉, the measurement accuracy is 0.2℉ plus or minus, very sensitive

User questions & answers

Question:	Does the heater have separate temperature setting or the controller should be used? also does the heater have max temperature set if controller fails
Answer:	Hi, there is no separate temperature setting in the heater and no max temp set for the heater, it must be used with the controller. The controller is high quality and reliable to use. When you set the temp to what you want, please remember to press the 'SET' button to finish the temp setting.
Question:	WIll this heater break if we put it vertically? In my tank there is not a good spot horizontally? The tank is tall so it will always be submerged
Answer:	Hi, it will not break if be placed vertically, just make sure the heater tube will be always be submerged.
Question:	Has anyone ran this vertically and was it effective
Answer:	I have the fluval flex 15 gal with this heater placed in the vertical position inside the pump chamber at the back of the aquarium. Works great. There is a minimum water imersion depth mark and label circling the cap of heater about an inch below where the electric cord attaches to the tube. Such a mark makes no sense if the heater could only be installed horizontally. So, yea... it's OK.
Question:	Is there a way to hang the temperature controller on the wall
Answer:	Yes it does have a hole in the back to hang it

Product features

Seawater resistant titanium metal aquarium heater

This metal aquarium heater tube is made of titanium, which is light weighted, durable and corrosion resistance. Specially designed for marine tank use, can also be used in fresh water.

For small size and medium size fish tank, from 5 to 120 gallon.

When does the heater stop and restart heating?

• It will stop heating when the water temp reaches to the set temp, restart heating when the water temp is 1℉ less than the set temp.
• There is a indicator light on the controller, when the heater is working the light is red, when it stops heating the light is off.

With precise digital temp controller and on seperate thermometer

How to set the digital heater temp controller?

1. When plug in, firstly press the button "Up" to choose the temp unit pattern,℃ or ℉.
2. Set the temp: press the button "Set" for 2-3 seconds until the set temp led flickering, then press the button "Down" or button "Up" to set the value to your desired temp, finally, press the "Set" button again to lock the value.
3. You can set the temp from 32℉to 104℉.
4. The controller will remember the last setting temp if power off occurs, but will change to the default unit ℃, when the power on again, you may need to reset the unit pattern to ℉.

The separate thermometer can detect a temperature from -68℉ to 140℉, the measurement accuracy is 0.2℉ plus or minus, very sensitive.

Directions for use

• For better experience and safety, please carefully read and follow the user manual.
• Please keep the heater fully submerged in water.
• Place the thermometer away from the heater and keep water in circulation.
• Place the heater horizontally near the water intake or on the way of water flow.
• Please wait the heater tube to cool down before moving it or changing the water.
• Don’t bury the heater in sand or mud.
• Please don't plug in before the heater is well installed.
• Don't suggest for acrylic or plastic tank.
• Please don’t use the heater alone without the digital temp controller.
• Once the controller occurs fault, please stop using it.

Choose the right wattage heater for your aqurium tank

Submersible heater size chart

Voltage: AC110-120V/60HZ

Wattage & fish tank size:

50W (5-10 gallon)

100W (10-25gallon)

200W (20-45 gallon)

500W (60-120 gallon)

Generally, when we choose a heater for the tank, we can base on that 3.8 wattage to 7 wattage per gallon water.

When the weather gets cold and room temp is lower than 50℉, please choose a larger wattage heater than normal recommended.

The heater and controller power cords are the same length 5.5ft, the thermometer cord is 4.4ft, long enought for most needs.