13 best submersible aquarium heaters

• ★【50 Watt Heater】: This Aquarium heater is suitable for 5 to 15 gallons aquariums, Length - 6.8 inch,voltage 110-120V, power cord is 4.0 ft, please choose the right wattage aquarium heater according to our size chart.
• ★【Temperature range】: 63°F~95°F , It is very easy to adjust the temperature you need, we also deliberately give each customer a free diving thermometer, you can observe the water temperature of the fish tank at any time.
• ★【Intelligent temperature control】：Automatic constant temperature function, when water temperature reaches to specified temperature value, heater will automatically stop heating, when water temperature is lower than the set temperature, heater will automatically start heating. Furthermore, Automatic safety shut-off feature, and overheating protection.
• ★【Note】: 1. Aquarium heater is 100% submersible use only, during its heating time, heater must be 100% submerged into the water.,Please unplug the power supply when cleaning the fish tank or aquarium water changes. 2. Heater rod is suitable for people over 16 years of age. Children or minors should be under adult guidance or supervision.
• ★【SATISFACTION GUARANTEED】: Gain the confidence to go hard with us! Our Aquarium Heater is built with durability in mind and safety for every design, In the remote possibility that you’re not satisfied with our product, just contact us, and we will gladly give you a new Aquarium Heater replacement. 12 Month Warranty and 24 Hour Professional After-sales Service.

User questions & answers

Question:	Can I use a short extension cord with this 25 watt heater because the port is so short
Answer:	About 2 in wide and 12 in long
Question:	Does this heater come with suction cups
Answer:	Not sure. Would have to make sure it does not rest on plastic liner. Heats water to very high temps. I have to keep unplugging it while heating hot tub. Goes well over 110 degrees. Too hot for fish.
Question:	Are their any directions to put the heater in
Answer:	I use mine to heat my 300 gallon stock tank pool. I use a filter with chlorine bleach. The heater works beautifully. When I take it out before we get in the pool, I wipe it down with a small towel. White residue will form but it comes off easily. I used it daily last summer August through September. Just set up the pool again yesterday and it’s working fine.
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:	Mine doesn't. I have touched the water while the heater still connects and nothing happened.

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

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.

• 【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

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: 200W submersible heater is suitable for 21.1 to 39.6 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:	can this be mounted on the bottom of the tank
Answer:	Thank you for your interest in this item. It does not list energy star on the specs we have.
Question:	Is the cord submersible as well
Answer:	Yes, that's what I'm using.
Question:	Auto shut off if not in water
Answer:	Yes. I just put it in a similar sized window. The exterior of the unit is less than 24" and it has the usual accordion-style wings and insulation to create a seal.
Question:	Does heater turn itself off when it goes on E1?...(due to water level being low
Answer:	Everything I needed was included for window installation. No additional exterior support was needed.

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

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.

• 🐟 Thickened Glass: 2mm thickened quartz glass, 33% thicker than 1.5mm normal aquarium heaters, much safer for human and your lovely fishes, your pets will no longer fear the winter.
• 🐟 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.
• 🐟 Quick and easy installation, submersible fish tank heater, vertical or horizontal placement using suction cups. 1 extra powerful suction cups as your backup (total 3).
• 🐟 50W aquarium heater, length 7.8-inch, power cord 4.9ft, designed for small fish tanks, recommended for aquariums up to 20 Gallons.
• 🐟 Bonus a stick-on thermometer, no need to buy another thermometer, 24-Hour Professional After-sales Service.

User questions & answers

Question:	Is there something wrong if the light hasn’t turned off since I got it
Answer:	I returned this product because it stopped working. What is the temp in your tank and how long has the heater been in? If the light won’t go off but the temp is too low or high there is something wrong.
Question:	No longer working after 2 months, how do I get a replacement
Answer:	Contact the seller. They should be able to help you? Are you sure its not working? Do you have an outside thermometer on your fishtank telling you what temperature it it is? Remember the light doesn't come on unless the water is to cold. In the winter when we have our heat on our homes are warmer which means the water will be warmer as well.
Question:	Do i place thermometer on inside of tank
Answer:	Definitely submerge it and do not put it outside of your tank!
Question:	How come my heater not turn off when it reach the temperature i set up? .It keeps going up until 90 degree . I have to turn off by myself
Answer:	Hi, for keeping high accuracy, the temperature sensor is designed near the water level mark, so you need to setup the heater under water fully----at least you need to make sure the water level mark is under water fully. If it is out of water, it means the detective sensor always detect the air but not the water, then it always finds the temperature still not reach what you want, then it keeps heating.

Product features

Explosion-proof Quartz Glass

2mm thickened quartz glass, 33% thicker than 1.5mm normal aquarium heaters, much safer for human and your lovely fishes, your pets will no longer fear the winter.

Warning:

Explosion-proof glass only means that the heater glass have been treated by special technology, it can withstand a wider range of temperature changes, it will not get broken for normal using. But all the glass will be shattered for knocking, so please take care to avoid that.

Note：

For all the Glass heaters, please check it carefully to see if there is any crack before using.

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.

Dimension

50 Watt Fish Tank Heater

- 7.8 x 1 x 1 inch

- 4.9ft cable wire

- Recommended for 5 ~ 20 Gallon tank

What you will receive?

1 x 50watt aquarium heater

Accessories: 3 suction cups / 1 stick-on thermometer

No need to buy another thermometer.

1. Fully Submerged

This submersible aquarium heater should be placed in a place with good water circulation.

Good waterproof design, no more worries.

2. About the Suction Cup

The suction cup should be placed in the upper part of the heater, not the heating part.

Otherwise, it may cause damage to the heater.

The correct installation, please refer to the picture above.

3. Vertical or Horizontal Installation

This aquarium heater can be placed vertically or horizontally, makes it easy to conceal behind plants or other decor according to your demands.

• 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!

• ★【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

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.

• √ [UPGRADED] MORE PRECISE TEMPERATURE - Upgraded sensing probes on the top of heater provides more precise induction that reduces temperature error which allows you check the temperature of the aquarium more easily to prevent the difference temperature in water from making the fish sick.
• √ [UPGRADED] DURABLE HEATING WIRE - The aquarium heater was changed from the original iron-chromium wire to the nickel-chromium wire to ensure the heater has longer life and precisely control heater temperature. It is extremely durable and stable, and faster heating than normal glass heaters.
• √ SAFETY PROTECTION - The fish tank aquarium heater has CE, FCC and ROHS certification. When sensing probe is exposed in the air or detected the water is overheating, the heater will stop heating. Giving your aquarium fish, amphibians, turtles safety protection.
• √ EASY TO ADJUST TEMPERATURE - LED digital display temperature that is easy to observe the temperature set by the heater. Using intelligent IC chip for more precise temperature control with less error (±1°C/±2℉). The touch button ensures that the hand is not wet when adjusting the temperature.
• √ SIMPLE OPERATION - The 400w fish tank heater can be used in 70-80gal gallon fresh water and salt water aquariums. Easy to set temp from 20°C ~ 34°C(68℉~ 94℉). Note: Don't expose the heater out of water surface as this may cause damage to the heater.

User questions & answers

Question:	Does this heater display fahrenheit
Answer:	yes
Question:	How do I get the E1 flashing to go away
Answer:	The 400w fish tank heater can be used in 70-80gal gallon fresh water and salt water aquariums. Easy to set temp from 20°C ~ 34°C(68℉~ 94℉). Note: Don't expose the heater out of water surface as this may cause damage to the heater.
Question:	Does this have a warranty? Mine worked great for about 4 months and now won’t heat
Answer:	Mine stopped heating too after a few months of reliable operation. Lights on, temp set but it never heats up. What’s the best way to contact about warranty?
Question:	My heater keeps flashing e
Answer:	That means that the heater is not fully lowered in water. It is a safety on the heater Incase the tank water is low, so the heater does not burn up. I use this heater in my sump and have to turn it sideways or I get the e-1 flash.

Product features

POPETPOP Aquarium Heaters Will Be Your Best Choice!

With the use of the temperature controller, this heating rod allows accurate thermal control via the intelligent chip and nickel-chromium heating wire for precise adjustments. It is easy to install and use, and great for both fresh water and marine water aquariums, aquaculture, terrariums and hydroponic systems!

Why Choose POPETPOP Aquarium Heater?

√ Over temperature protection.

√ Adjustable temperature from 20-34℃(68-94℉).

√ The sensing probes provides more precise induction.

√ Maintain constant and stable temperature for your aquatic creatures.

√ Nickel-chromium wire can increase heating wire life and precisely control heater temperature.

Intelligent Display

Makes you very easy to check the temperature of the aquarium.

Red Light - Water temperature is below set range, aquarium heater automatic heating.

Blue Light - Water temperature is within desired set range, keeping constant temperature.

High Quality Materials

Made of titanium heating element construct. It is extremely durable and stable, providing explosion-proof, waterproof, scald-preventing and safe operation for you and your lovely pets.

Durable Suction Cups

Come with 2 suction cups. You can install the aquarium heater both vertically and horizontally but it must be fully submerged in water when working.

Product description

Dear friends, our heaters have passed the most rigorous tests before leaving the factory. If there are any quality problems, you can get a new heater or a full refund for free. Please rest assured to buy. We guarantee that you are satisfied with our products.

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.

Our aquarium heater help your fish and other aquatic keeping away from stress and diseases by providing proper temperature.

Features

1, The aquarium heater is provided with an extra thermometer to show the accurate tank temperature to avoid overheat or freeze.

2, The aquarium heater is operating as a staged heating, once achieved the setting temperature, it will stop heating for a while, and then continue working to maintain the temperature.

3, Easy to set and adjust to the setting temperature with the use of the temperature adjustment knob, offers simple installation.

4,Strong suction cup TIGHTLY FIX the heater to the tank.

Notices

1, Before powering, make sure the heater is completely submerged in the water.

2, Before removing the heater out from the water, make sure the heater is unplugged to avoid dry heating.

3, Please NOT put the aquarium heater into the sand as this will cause INACCURATE heating.

Specification

Power: 300W/ 100W/ 50W

Voltage: 110V-120V,50-60HZ

Package Include

1* Submersible Aquarium Heater

1*Heater protecter(with sucker)

1* Thermometer(with battery)

• UPGRADED MORE DURABLE VERSION: Provided the best warm area to your fish in the cold winter.Keeps improving best aquarium heater for your fish tank, after collecting so many comments from customers, we upgrade its function and life time, now it works more continuously and accurately.
• MORE SAFETY & HIGH QUALITY: This upgraded aquarium heater now updated for more 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.
• FREE THERMOMETER: This fish tank heater come with an extra thermometer to show the accurate tank temperature to avoid overheat or freeze. It provide a constant warm environment for your pet fish to stay healthy, suitable both for fresh and salt water.
• TEMPERATURE CONTROL: Aquarium heater works in intermittent operation mode and will automatically turn on/off to achieve the setting temperature constantly and stably. Setting the temperature by the red knob on the top with range is 64°F - 94°F.High accuracy(±1°F)
• APPLICABLE TANK SIZE: Our submersible aquarium heaters are perfect designed for different size tank, 50W for 5-10 gallon; 100W for 10-30 gallon; 300W for 30-85 gallon, please choose the suitable power for your tank. And we also recommend to position it near a strong water flow, the outlet of a power filter is ideal, so that the whole aquarium are in the same temperature.

User questions & answers

Question:	Can this be used for fresh water tank
Answer:	Yes, I have this heater in my 60 gallon tank.
Question:	Does this heater come in Farenheit readings or celcius only
Answer:	come in ffarenheit
Question:	I have a 60 gallon tank. Is this going to heat it thoroughly
Answer:	Mine is 55 and and I turned it up to about 3/4 and keeps it at 72-74. So I'd say yes.
Question:	What is the max set temp for this unit. I'm not using it for a fish tank
Answer:	94 degrees I think im not sure I only got it on 75 degrees for my tank

• 🐟 Thickened Glass: 2mm thickened quartz glass, 33% thicker than 1.5mm normal aquarium heaters, much safer for human and your lovely fishes, your pets will no longer fear the winter.
• 🐟 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.
• 🐟 Quick and easy installation, submersible fish tank heater, vertical or horizontal placement using suction cups. 1 extra powerful suction cups as your backup (total 3).
• 🐟 100W aquarium heater, length 9.5-inch, power cord 4.9ft, designed for small fish tanks, recommended for aquariums 10 to 30 Gallons.
• 🐟 Bonus a stick-on thermometer, no need to buy another thermometer, 24-Hour Professional After-sales Service.

User questions & answers

Question:	Do I need to use a heater protector to prevent my musk turtle hatchling from burning herself? Has anyone found a good-fitting protector for it
Answer:	This heater MUST be submerged in water. If your turtle is basically a land reptile, this one won't work as a space heater. There are some other ones out there for that purpose.
Question:	Has anyone calculated yearly cost of operation for a 20 gal tank in a 50 degree room? Estimates
Answer:	It would be difficult to calculate an exact cost with so many variables. Is your 20 gal long or tall or hex? Does it get any sun? Is it live planted? What temp do you want it at? What's in it? What filters do you have and what is your gpm turnover rate? To get your answer: Tank volume ÷ sq inches of tank = A. A × gpm rate =B. (If live planted: add A + B =C. C ÷ 15.275 = D. Subtract C - D = E. If not B = E.) From here take average water temp × E = F Multiply F × 8760 (hours in a year) = G. This is your hourly. G × kph rate of your electricity = H. And finally you will take H and multiply it by; Why in the hell do you want to be in a 50° room? Better yet, why would you want to keep fish in there??
Question:	I’ve had my heater a few months now and noticed a brittle film peeling off the quartz part of the heater. Should I be concerned
Answer:	Oh, have it been bumped? Could you contact with us and give us a photo? This heaters have been manufactured and sell to all around the word for more than 10 years, but we never heard this situation.
Question:	Will this work well in my 40 gallon red eared slider tank
Answer:	We use it in our 60 gallon for our red eared and it works great. Have no problems. I truly think it is the best heater we have gotten. You can maintain the temp in the tank very easily.

Product features

Explosion-proof Quartz Glass

2mm thickened quartz glass, 33% thicker than 1.5mm normal aquarium heaters, much safer for human and your lovely fishes, your pets will no longer fear the winter.

Warning:

Explosion-proof glass only means that the heater glass have been treated by special technology, it can withstand a wider range of temperature changes, it will not get broken for normal using. But all the glass will be shattered for knocking, so please take care to avoid that.

Note：

For all the Glass heaters, please check it carefully to see if there is any crack before using.

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.

Dimension

100 Watt Fish Tank Heater

- 9.5x 1 x 1 inch

- 4.9ft cable wire

- Recommended for 10 ~ 30 Gallon tank

What you will receive?

1 x 100watt aquarium heater

Accessories: 3 suction cups / 1 stick-on thermometer

No need to buy another thermometer.

1. Fully Submerged

This submersible aquarium heater should be placed in a place with good water circulation.

Good waterproof design, no more worries.

2. About the Suction Cup

The suction cup should be placed in the upper part of the heater, not the heating part.

Otherwise, it may cause damage to the heater.

The correct installation, please refer to the picture above.

3. Vertical or Horizontal Installation

This aquarium heater can be placed vertically or horizontally, makes it easy to conceal behind plants or other decor according to your demands.Suitable for turtle tank.