13 best fish tank heaters

• ★【Betta Heater】This Fish Tank Heater should be 100% submerged into water, Ideal for small glass or acrylic desktop aquariums up 1 to 6 Gallons, not suitable for less than 1 gallon tank.
• ★【Quick and Easy Installation】:Vertical or horizontal placement using, Aquarium heater automatic temperature control 78℉, no need to adjust temperature, easy to operate, fishes happy.
• ★【How it Works】: Plug in, red light turns on, the heater will start working until water temperature up to 78°F, and red light off, then the green light will turn on, heater stop working and keeping constant temperature 78°F. Accuracy：±3°F
• ★【Note】: Do not operate or leave product plugged in when it is outside of water, Children should be use this heater under adult's guidance.
• ★【SATISFACTION GUARANTEED】Our Aquarium Heater is built with durability in mind and safety for every design. In the remote possibility that you’re not satisfied with our product, just contact us, and we will gladly give you a new Aquarium Heater replacement. 12 Month Warranty and 24 Hour Professional After-sales Service.

User questions & answers

Question:	How do you change the fishes water with this in it
Answer:	I just turn mine off when I change the water
Question:	Can you install two of this in a 10 gallons tank
Answer:	I would this so as long as they are as far away as possible from the school other. But by the time you buy 2 of these you could just buy a bigger one for your tank.
Question:	Will this overheat a one gallon tank
Answer:	I bought it for my 1.5 gallon tank and it made my tank 93 degrees it does not shut off like it's suppose too!
Question:	I want this for a tank with a beta - no water current. Is this going to work you think
Answer:	We have a pump, but our Beta sits right on top on the heater and is fine.

Product features

Maintenance

This heater is free maintenance item, for the good of heater function and service life, we suggest:

• Check the heater working status regularly, if any strange signs,please plug off immediately.
• Clean the heater suction cups regularly (3 months)with 140℉ warm water and soak it for a while.
• If you found any soil or moss things covered on the heater, please plug off the heater and clean it with fresh water after a few minutes later, especially the heating part stains. Do not use any other liquid to clean the heater, it may damage the heater

Product description

Aquatic 5 Watt Flat Heaters provide warmth for small tropical fish and are designed for glass or acrylic desktop aquariums up to 2.5 gallons. They are completely submersible, easy to install and efficiently warm aquarium water. Suctions cups are included so you can mount the heater to the bottom or side wall of the aquarium. Be sure to choose the appropriate size for your aquarium. Do not operate or leave product plugged in when it is outside of water.

• Fully submersible
• Vertical or horizontal placement using suction cups that mount to the bottom or side wall of tank
• Quick and easy installation
• Shatterproof construction
• Can be used with glass or acrylic enclosures
• Note: Do NOT operate or leave product plugged in when it is outside of water
• 5 watt works best for up to 2.5 gallon fish tanks

User questions & answers

Question:	How long before I can put my fish in the water
Answer:	Hi Michael! There are (4) 7" sections.
Question:	Why does my fish hide and go to the bottom of the tank when I turn it on
Answer:	3/4 inch
Question:	Does this work in a 3-gallon bowl although it says for up to 2.5-gallon bowl
Answer:	A lot of occurrences could be causing buildup within your tank, such as having the lights on for too long. We invite you to reach out to us directly at 1-888-255-4527 so we can gather additional details from you and provide proper assistance.
Question:	Got this and didn't work. was sent a second one and doesn't work either. no change in water temperature whatsoever and is only a 1.5 gallon tank
Answer:	The polisher uses an Aqueon Large Cartridge which should be replaced monthly. In the canister itself most of the media does not get replaced. The bottom tray is biological (bio balls and ceramic pieces) which unless there is physical damage do not get replaced. The top tray is a course media sponge which should be rinsed out and put back in and the middle is the charcoal which does need to be replaced no less than once a quarter. All of these replacement items are available from Aqueon. If you have further questions, I suggest you contact Aqueon Tech and Warranty at 888-255-4527 and they can give you personal answers to your questions

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" 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.

• ★300W aquarium heater is suitable for 50 to 80 gallons aquariums,Length - 11 inch,voltage 110-120V, power cord is 6ft, please choose the right wattage aquarium heater according to our size chart.
• ★It shows an area to adjust the temperature. It's not exactly accurate but it turns easy and can be adjusted at small intervals.
• ★Explosion Proof: 2mm thickened quartz glass,can be used in fresh water and salt water aquariums,easy to hide in the tank.
• ★Precise temperature dial from 68 to 89°F allows for complete control of aquatic climate within a 1-degree difference.
• ★Adjustable Aquarium Fish Tank Water Heater Sensitive and reliable thermostat maintains uniform temperature. Automatic shut off when the temperature is reached

User questions & answers

Question:	Can the thermometer be mounted inside the tank. Somewhere here said yes but an example I saw had it mounted outside the glass. Which is correct
Answer:	The small pointy end mounts in the tank and then the temperature reading display mounts on the outside they are connected.
Question:	I set the temperature 77 but it heats 83.4 what should I do
Answer:	Send it back it must not be working correctly because if you set it add 77 it should stay there
Question:	Is this heater UL listed
Answer:	Yes the 150W heater
Question:	Digital Thermometer supplied with this heater is almost 3°F off. Is there a way to calibrate it
Answer:	I would not know how to calibrate it, but just monitor the tank temp. I do not look at the temp on the heater, just the tank water and this heater holds it very constant.

• 【Compact and Quiet, 50W Heater】 YukiHalu small aquarium heater is suitable for 1~10 gallon mini fish tanks. Much more compact than a comparable 50W glass tube heater and takes less space in your tank, easy to hide in the tank. Temperature can be accurately adjusted from 64 to 93°F. This heater suitable for both saltwater and freshwater. The rated voltage is 100-130V.
• 【1℉ Accuracy & Intelligent Frequency Conversion】Thanks to advanced Intelligent Frequency Conversion Technology, the temperature accuracy is up to 1℉. If the temperature is lower than the target value of 0.2°F, the heater works at a Variable frequency to keep the temperature constant. If the water temperature is lower than the target temperature of 1°F, the heater will work at full power. Compare to traditional heater, this new technology will cut down 49% electricity bill for you.
• 【Easy to adjust the temperature without wet your hands】The heater is its external controller to set the temp instead of dipping your hands into your tank to rotate a dial found on most glass tube heaters. Here you can change the temperature as many times as you like without having to ever wet your hands or contaminating your tank. 3 Strong suction cups, easy to install.
• 【Easy to Read & Built-in Thermometer】Dual built-in temperature sensor. Dual LED display. The water temperature will be displayed on both the heater and the external temperature controller in real time.
• 【Safety & 4 Protections】Electric Leakage protection / Overheating protection / Dry running protection / Out of water protection. Sturdy engineering plastic shield, scalding resistant and explosion resistant. 30 days full refund, 12-months warranty.

User questions & answers

Question:	Will this be ok for a 2 gallon Tank
Answer:	Yes, please go head. it is good for 2 ganllons
Question:	The screen on the controller shows e 1 and i would like to changed the temperature. even when i long press the button it still shows e 1. how to fix
Answer:	User is required to manually calibrate the heater in the following 2 failures: 1,The heating rod is completely immersed in water, but the display shows ‘E1' error code. 2, The heating rod is out of water, however, E1 error code don’t display. Calibrate the device according to the following steps: Step 1, Take the heating rod out of the water and clean the display surface area of the heating rod. Step 2, Put the heating rod on the desk ( not in the water), Wetting the display part of the heater. Power on the heating rod. Within 1 second after the heater controller display shows 8.88, press and hold the touch button until the controller display shows 'FC' and flashes 3 times and then stops flashing. Then release the button. (About 4~6 seconds during this step) Step 3, Short press the touch button once, the controller display shows 'CFF' and flashes 3 times and then stops flashing. Step 4, Power off the device, after 10 seconds, power on again, both the display in controller and the heating rod shows 'E1', Calibration complete.
Question:	Not accurately keeping temperature. I set the temp according to instructions and the screen reads 85° with a green but the actual water temp is
Answer:	I haven’t had that issue...yet. It’s only been 2 weeks since I’ve had my unit and so far it’s temp reading is similar to a manual thermometer I have at the bottom of the fish tank, within a few degrees...a small 3.5 gal Betta tank. How long have you had your unit?
Question:	How do I turn the temp down to reach my desired temp
Answer:	For example: current water temperature is 60F, the target temperature set in last time is 80F, you want to set the new target temperature to 70F, the steps are following: A, Long-press the power button in heater controller to unlock. The number flashing on the LED screen is 80F (target temperature set last time) B, short-press the power button 20 times, the number on LED screen will increase from 80F to 93F, and then go back to 64F, and finally increase to70F. Short-press one time, temperature increase 1F. C, Wait for 3 seconds ( no operation), the setting is active. New target temperature is 70F now.

Product features

CAUTIONS:

1, The device must be used under rated voltage 100-130V. This version don't support 220V voltage.

2, The heater must be fully submersed into the water. The temperature controller must be kept away from the water as it is not waterproof.

3, Please read the user manual in package carefully before using. DO NOT plug heater into an electrical outlet until it is placed inside the aquarium.

Intelligent Frequency Conversion Technology

1. The working process is not " Water cooling" --> "Start heating" --> "Reach setting temperature" --> "Stop heating".
2. The special point for this device is that the working process is based on "Intelligent Frequency Conversion Technology". The heater working frequency will be changed according to temperature variation.
3. Thanks for PID algorithms, if the temperature is lower than the target value of 0.2°F, the heater works at a variable frequency to keep the temperature constant. If the water temperature is lower than the target temperature of 1°F , the heater will work at full power. RED indicator light on. The water temperature curve is almost a line.
4. Energy saving. Compare to traditional heater, this new technology will cut down 49% electricity bill for you.
5. However, please choose the right heater power according the aquarium volume. 50W for 1~10 gallon, and 100W for 20 gallon

Easy to set temperature yourself

• Press and hold the button in external controller for more than 3 seconds to unlock the key
• Short-press the button once, the temperature number will increase 1℉. Keep short-pressing the button until the target temperature is reached. It is a cyclic adjustment

Easy to know the working status

• 3 Color indicator. Red: heater working in full power. Green: heater works at a variable frequency. Yellow: ERROR.
• 3 ERROR CODES. E1: out of water protection; H1: over heating protection; H2: Dry running protection.

Easy to read temperature

• Built-in Thermometer
• Dual built-in temperature sensor, The temperature is measured more accurately
• Dual LED display. The water temperature will be displayed on both the heater and the external temperature controller in real time

High accuracy up to 1℉

• Thanks to advanced Intelligent Frequency Conversion Technology, the temperature accuracy is up to 1℉.
• Please select the right heater power according to the tank volume. 50W for 1~10Gallons, 100W for 20 Gallons.

Safety, Electric Leakage Protection

• The water will be directly connected to the GROUND through the ground pin in power plug. No electrical shock
• Protection against overheating / dry running / out of water.

Easy to install, Mini size

• Small size. 3.3X2.7X1.2 inch.
• Perfect for small fish tank, the heater is easy to hide in tank.
• 3 Strong suction cups, easy to install

Applicable for freshwater, saltwater and marine aquariums, aquaculture, glass containers, and hydroponic systems

• User is required to manually calibrate the heater if the heating rod is completely immersed in water, but the display shows ‘E1' error code.

1. Step 1, Take the heating rod out of the water and clean the display surface area of the heating rod.
2. Step 2, Put the heating rod on the desk ( not in the water), Power on the heating rod. Within 1 second after the heater controller display shows 8.88, press and hold the touch button until the controller display shows 'FC' and flashes 3 times and then stops flashing. Then release the button. (About 4~6 seconds during this step).
3. Step 3, Short press the touch button once, the controller display shows 'CFF' and flashes 3 times and then stops flashing.
4. Step 4, Power off the device, after 10 seconds, power on again, both the display in controller and the heating rod shows 'E1', Calibration complete.

• ★【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.

• ★【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

• High Quality: Aquarium heater made of high quality quartz glass, double seal material , advanced design, ensures safe operation.
• Adjustable Temperature: The temperature of the fish tank heater can be adjusted automatically. Temperature setting range: 20°~34°C(65° F - 93° F), and the display is easy to read.
• Fully Submersible. Power: 100W. Suggested water volume: 20 gal.
• Both suiting for fresh or saltwater aquariums, provide a constant warm environment for your tropical fish to stay healthy.
• Convenient and Safe: Our aquarium heater thermostat has two suction cups for attachment to the fish tank. The polarized plug prevents electrical shock.

User questions & answers

Question:	does it turn off when it is at the chosen temperature
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:	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 think its supposed to stay on
Question:	Can i use this on a circular aquarium? Will the suction cups hold to a circular tank
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:	What is the actual length of the 50W heater itself, not the cord
Answer:	The aquarium heater 50W is about 9.5 inch long.Hope this helps you.

Product features

Mylivell Submersible Aquarium Heater

• You will need an aquarium heater to keep your tank in a steady and controlled temperature, as proper temperature range is very important to fish and other Aquatic in winter.
• Mylivell Submersible Aquarium Heaters are one of the most popular way to keep your tank at a steady and controlled temperature, Fish water heater will be your best choice!

Product description

Aqueon Preset Heaters require no adjusting! The preset temperature has been calibrated to 78°, appropriate for most tropical fish. The fully submersible heaters are constructed of shatter-resistant quartz glass and features an automatic safety shut-off to avoid overheating. An LED indicator light displays red when actively heating. Can be positioned at a horizontal or vertical angle in your tank.

• Preset to 78 degrees, appropriate for most tropical fish.
• Fully submersible, shatter-resistant construction
• Automatic safety shut-off avoids overheating and damage
• LED indicator light displays when actively heating
• 1 year warranty
• 100 watt is recommended for 20 and 30 gallon aquariums

User questions & answers

Question:	how long is this heater
Answer:	The process of “cycling” does not begin until fish or a culture of nitrifying bacteria are added to an aquarium, but the longer you wait to add the first fish after initially setting up your tank, the better. Most aquarium experts recommend waiting at least 48 to 72 hours. Always check temperature and test for pH and ammonia first, as many municipalities add chloramine to tap water and a single dose of water conditioner does not always fully neutralize the ammonia.
Question:	What’s the lifespan of this heater
Answer:	Fish are timid. Unfamiliar object will cause stress.
Question:	is this a timed heater ? I have been having having trouble with the light turning off
Answer:	It will "work", but it may not bring the temp up more than 5 degrees or so. I have mine in a 1 gallon bowl with a bubbler to move the water around a little and it went from about 68F room temp to a steady and even 78F, perfect for a betta.
Question:	Does this heater come with suction cups? This heater came with a 29 gallon setup I won but it did not have suctions cups
Answer:	I purchased it. Have a 1.5 gallon. It warms just a little bit but you need to keep the tank closed. It really doesn’t warm up a lot like you think it will.

• ★【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

About intelligent indicator green light and red light:

Press set button to start the temperature setting. The LED display will start to flash, continue pressing set button, until it reach your desired temp. When the water temperature is below your set range, heating function of red light will engage and increase temperature automatically, while green light means the water temperature is within desired set range and monitoring function is engaged.



Please read carefully about the following tips:

1.DO NOT use the aquarium heater if the cord / heater is damaged.

2.You MUST NOT place the controller in the water.

3.Please cut off the electricity when installs the heater.

4.Please unplug the heater when cleaning the fish tank or changing aquarium water.

5.Children or minors should be under adult guidance or supervision.



Item Specification:

Power & Voltage: 500W & 110V~120V (The power cord and plug have UL certification)

Capacity of Tank: 79 to 120 gallons

Outer Temp Control: Ranger from 68℉-93℉(±1℉)

Length of Cord: 59 Inches from controller to heater, 39 inches from controller to plug.



Includes Package:

1 x 500W Heater with 2 Suckers Attached & 1 Temp Probe

1 x External Temp Controller

1 x Installation Manual

• 【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. The external temp controller brings you more convenient and safe to adjust the set temp externally.
• 【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.
• 【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. Besides, the thick heatproof cover will also prevent your little fishes from scalding.
• 【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.
• 【Super Easy to Setup with Wide Compatibility.】 This 500W submersible heater is suitable for 79 to 120 gallons fish turtle tank and the power cord and plug have UL certification, which has more safety guarantee while heating. It is applied for freshwater and marine aquariums, aquaculture, glass containers, and hydroponic systems.

User questions & answers

Question:	Can somebody tell me if those fish tank heaters work appropriately to maintain constant and stable temperatures
Answer:	I believe you’re talking about the separate thermometer that comes with it? If so, you need to unscrew the back, remove the battery, and then you’ll see a small pc of plastic preventing the battery from making contact. Remover the plastic and then replace the battery and backing securely before placing into the water.
Question:	I want to know if the digital fish tank heaters scald the fish’s tail
Answer:	I don't keep my house that cold at night, but it's been keeping my 25 gallon at a constant temp with no issues.
Question:	What are the overall dimensions of the 500W heating element
Answer:	NO, 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.
Question:	Can this aquarium submersible heater be placed diagonally, vertically, and horizontally
Answer:	Yes as long as it is completely submerged in water.

• ★【Quartz glass heater】: The heating device is made of heat-resistant quartz glass, explosion-proof and strong thermal conductivity. It can be used for 1-5 gallon glass or acrylic fish tanks.
• ★【Easy to operate】: This heater is different from traditional heaters. It is designed with an external controller for temperature display and temperature adjustment, which can freely adjust the temperature you need (68°F-93°F).
• ★【Intelligent temperature control】: The heater effectively maintains the temperature you preset before, and stops heating when the water temperature reaches the preset temperature, and restarts heating when the water temperature is lower than the preset temperature by 2-3°F.The red light on the LED screen indicates that the heater is heating, and the blue light indicates that the heater has finished heating and is in a constant temperature state.
• ★【Note】: The heater needs to be fully submerged, the external controller is not waterproof, and children need to be used under the supervision or guidance of adults.
• ★【SATISFACTION GUARANTEED】Our Aquarium Heater is built with durability in mind and safety for every design. In the remote possibility that you’re not satisfied with our product, just contact us, and we will gladly give you a new Aquarium Heater replacement. 12 Month Warranty and 24 Hour Professional After-sales Service.

User questions & answers

Question:	The hearter reading seems to be different than my aquarium thermostat. Anyone else got same problem
Answer:	Yes! It’s always different. It’s always warmer than the thermometer. But my fig and plants are doing great so I guess it’s okay.
Question:	Can this be kept on
Answer:	ABSOLUTELY! It is designed to be plugged in, and it monitors the temperature 24/7.
Question:	Anyone try a protective guard/cover on this? Concerned re fish safety/scalding; thnx
Answer:	I don't believe the heater gets hot enough to scald the fish. The heater only lets the water get 2-3 degrees cooler than the setpoint (if I set the temperature to 75 F, the heater will turn on at 72 or 73 F), so it doesn't need to work hard to get the water up to temperature. Also, water is an excellent conductor of heat, so if the outside temperature of the heater is hot enough to scald the fish, then all the water is probably hot enough to scald the fish.
Question:	Why is the heater blinking ll? i just plugged it in this morning and it is warming but blinking red ll. is it defective? please let me know. thank
Answer:	If you click though all the temperature options, and go back to desired temperature, it should stop flashing LL and show you the temperate it is at instead

Product features

How to use the external controller:

• Plug in, the controller LED lights on, press the button and switch it continuously until the LED display shows your expecting temperature (From 68~93℉ ), and wait 3 seconds for system confirmation, then heater will start heating up to your preset temperature.
• Red lights means the heater is on heating mode, when heater heating up to the preset temperature, blue lights on, and heater will stop heating (Restart heating when temperature less than preset temperature)
• Operation for example: Plug in and LED display shows preset temperature 68℉, you want adjust it to 78℉, then press the button 10 times continuously, LED display will shows 78℉, and wait 3 seconds flashing, then setting fishined, heater will start heating from 68℉ to 78℉.

Maintenance:

This heater is free maintenance item, for the good of heater function and service life, we suggest:

• Check the heater working status regularly, if any strange signs,please plug off immediately.
• Clean the heater suction cups regularly (3 months)with 140℉ warm water and soak it for a while.
• If you found any soil or moss things covered on the heater, please plug off the heater and clean it with fresh water after a few minutes later, especially the heating part stains. Do not use any other liquid to clean the heater, it may damage the heater

Cautions:

• Please install and use this heater under rated voltage conditions(110V-120V/60Hz).
• This heater is designed for small fresh/sea water tanks, please do not use it in chemical water or any other heating purpose, it may damage the heater.
• Children should be use this heater under adult's guidance.
• IPX8 design, non-detachable, do not disassemble it, otherwise it will damage the heater.
• To ensure the heater normal functions and safety concerns, heater should be fully subermerged.
• Fish tank temperature is very easy to affected by the room temperature, therefore it makes the water temperature inaccurate, normally ± 2℉ differency.
• To help the heater works more efficiently, please use the heater in a circulating water tank, still water will make the heater area water temperature higher than other side.

External Controller

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

Quartz glass heater

The heating device is made of heat-resistant quartz glass

Suction cup

Strong suction cups attached can suck the heating rod on the fish tank wall.

Specification

Power : 25Watt

Voltage: 110-120V/60HZ

Cable Length: 5.0 ft

• Uniclife submersible heater, ideal for 5-15gal fish tanks, can be installed in both fresh and saltwater.
• Red rotatable knob on top for adjusting the temperatures between ranges of 68°F-93°F. Visible temperature displayed allows accurate temperature maintain.
• Please notice the red indicator light is on while working, will automatically turned off when temperature reached. Carefully check external condition before use. Recommend testing before introduce to fish.
• Water-tight with IP68 sealing workmanship. Fix the heater tightly to the tank in vertical or horizontal with 3 strong suction cups. Shatterproof 2 mm extra thick quartz glass prevents electricity leakage and scratching. Measures 8.6" x 1" (L x D)
• Come with Uniclife aquarium heater x 1; Suction Cups x 3; stick-on thermometer x 1(Color of number will change to blue to indicate the temperature).

Product features

Uniclife 50W Aquarium Heater for 5- 15 Gallons

An aquarium heater is an essential device for warming water in your fish tank. HT-6050 Anti-Explosion Fish Tank Heater is suitable for up to 15 gallon aquariums, which can help your tropical fish and other aquatic pets to keep away from stress and disease by providing proper temperature. The heater will keep your tank at a constant temp especially in cold days. A good range for most fish is 76℉ to 80℉.

Easy Adjustment

• By rotating the Red knob at the top you can simply set the temperature from 68 - 93°F.
• The red indicator light on while heating, automatic shut-off when reach the temp.

Submersible

• The aquarium glass submersible heater must be fully immersed.
• Install it either vertically or horizontally by attaching the suction cups to the glass of the tank.

Stick-on Thermometer

• Distinguishable blue color shows the current temperature of your aquarium water.
• Monitor and maintain a constant warm environment for your fish's health.

• 【Small Size Heater】 AUOMII 50W small size aquarium heater is suitable for 1~10 gallon mini fish tanks, and easy to hide in the tank. Temperature can be accurately adjusted from 64~93°F. This heater suitable for both saltwater and freshwater. The rated voltage is 100-130V. Easy to set temperature, Easy to read temperature, Easy to install
• 【Intelligent Frequency Conversion Technology】Temperature accuracy is up to 1℉ as advanced Intelligent Frequency Conversion Technology. If the temperature is lower than the target value of 0.2°F, the heater works at a variable frequency to keep the temperature constant. The working frequency will be changed according to temperature variation. If the water temperature is lower than the target temperature of 1°F , the heater will work at full power. The temperature curve is almost a line
• 【Safety and Reliable】3 pin plug with ground wire, connect the water to ground directly, no risk of electric shock. 4 protections: Leakage protection / Over heating protection / Dry running protection / Out of water protection. Sturdy engineering plastic shield, scalding resistant and explosion resistant. Using touch control button, easy to set and read the temperature. 3 Strong suction cups, easy to install
• 【Built-in Thermometer】Water temperature will be displayed on both the heater and external temperature controller in real time. Dual built-in temperature sensor. Dual LED display. High accuracy temperature as the temperature sensor is contact with water directly and have excellent heat conduction
• 【30days refund 12 months replacement】Your purchase today is completely RISK-FREE. If you are not completely satisfied for our device, let us know for a full refund. Why wait? Get it today

User questions & answers

Question:	The temp reading keeps fluctuation from 79.1 to 80.1up &down by tenths/degree. water temp stays constant. does it do this all the time
Answer:	My experience has been that it DOES fluctuate slightly but not enough to make a difference in the water temperature to be harmful to the fish
Question:	Wonder if this would keep a 7 gal chichen water bucket from freezing
Answer:	If you're bucket is suspended and the cord follows the line holding the bucket then the chickens leave the cord alone. I've been using it this way for 2 months; works great. I use the spring action drinking cups attached and cover them ever m every night with thermal coverings to keep the cup from freezing. I made the coverings from cut up cooler bags.
Question:	Can this heater be hidden under the substrate
Answer:	Dears, I think yes. It is smallest one in market. please try.
Question:	What happens when there is a power failure ? Will the unit remember the settings, or will it zero itself
Answer:	the device will remember the setting. Please contact seller for technical support. you can also replace a new kit.

Product features

CAUTIONS:

1, This device must be used under rated voltage 100-130V. The device don't support universal voltage.

2, The heater must be fully submersed into the water. The external temperature controller must be kept away from the water as it is not waterproof.

3, Please read the user manual in package carefully before using. DO NOT plug heater into an electrical outlet until it is placed inside the aquarium.

Intelligent Frequency Conversion Technology

• The working process is not " Water cooling" --> "Start heating" --> "Reach setting temperature" --> "Stop heating".
• The special point for this heater is that the working process is based on "Intelligent Frequency Conversion Technology". The heater's working frequency will be changed according to temperature variation.
• Thanks for PID algorithms, if the temperature is lower than the target value of 0.2°F, the heater works at a variable frequency to keep the temperature constant. Green indicator light on. If the water temperature is lower than the target temperature of 1°F , the heater will work at full power. RED indicator light on.
• The water temperature curve is almost a line.
• However, please choose the right heater power according the aquarium volume. 50W for 1~10 gallon, and 100W for 20 gallon

Easy to install, Mini size

• Small size: 2.9 X 2.7 X 1.2 in
• Perfect for mini aquarium tank, easy to hide in tank
• 3 Strong suction cups, easy to install

Easy to set temperature

• Press and hold the button in external controller for more than 3 seconds to unlock the key
• Short-press the button once, the temperature number will increase 1℉. Keep short-pressing the button until the target temperature is reached. It is a cyclic adjustment

Easy to read temperature

• Built-in thermometer
• Dual built-in temperature sensor, The temperature is measured more accurately
• Dual LED display. The water temperature will be displayed on both the heater and the external temperature controller in real time

High accuracy up to 1℉

• Thanks to advanced Intelligent Frequency Conversion Technology, the temperature accuracy is up to 1℉.

Safety, Electric Leakage protection

• The water will be directly connected to the GROUND through the ground pin in the power plug. No electrical shock
• Overheating protection / Dry running protection / Out of water protection

3 color indicator, 3 Error codes

• 3 color indicator, 3 Error codes.
• RED: Heating / GREEN: No heating / YELLOW: fault.
• E1: Out of water / H1: Over heating / H2: Dry running.

Applicable for freshwater, saltwater and marine aquariums, aquaculture, glass containers, and hydroponic systems