13 best mini aquarium heaters

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

Aquatic 7.5 Watt Flat Heaters provide warmth for small tropical fish and are designed for glass or acrylic desktop aquariums 1 gallon to 3 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
• Warms aquarium water up to 6°F above ambient room temperature
• 7.5 Watt works best for 1 to 3 gallon fish tanks

User questions & answers

Question:	Cam this be placed under gravel in the tank
Answer:	Yes, can be installed horizontally.. be sure to keep fully submerged at all times..
Question:	Will this turn off at 78 degrees
Answer:	Hi All heaters that have the element and thermostat in one unit should always be mounted on an angle or horizontally. The reason being heat rises and if the unit is mounted straight up and down it will turn on and off constantly and burn itself out.
Question:	Can it heat a 10 gallon tank
Answer:	120 Volts
Question:	Is this really 8 inches
Answer:	It doesn't. The light is in the part of it that goes underwater and it's blue. I can't see mine with the light on usually unless I look. But the light will turn off when the heater turns off.

• ★ Temperature range: 59°F~94°F, display Fahrenheit °F, this heater is designed for1~10 gallons tank.
• ★ 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.
• ★ Touch button, cyclic adjust temperature , easy to use and Safety.
• ★【Note】:this heater is 100% submersible use only, during its heating time, heater must be 100% submerged into the water.
• ★【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 heater is displaying EE what does that means? It came without any instructions
Answer:	They don’t have a physical store.
Question:	What type of plastic is it made of
Answer:	Not an issue we would be happy to fulfill this request. Please email us at [email protected] after placing the order letting us know your request!
Question:	Can i adjust it to set to 78 degrees F for a betta fish
Answer:	I believe the traditional answer is one inch of fish per gallon of water, so, it depends on how big these are.
Question:	No directions came with my heater....How can I adjust the temp so that it actually sticks
Answer:	A 10-15 gallon tank would be smallest we would recommend.

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

• ★【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

The Smallest 25Watt Aquarium Heater For Your needs



Specification:

Power: 25Watt

Voltage: 110V~120V/50~60Hz

Heater Size:

Power cord:

Application: 1 to 5 gallon aquarium



Features:

- The Smallest 25W Heater On The Market

- 78℉ Constant Temperature

- Rubber Sealing Layer

- Quartz Glass Material

- One Year Warranty And 24 Hours Professional Customer Service



Why Choose DaToo MINI 25W Aquarium Heater?

1. No Need To Set: DaToo MINI 25W Aquarium Heater will automatically keep the water temperature constant at 78℉. Simple and convenient, very suitable for beginners.

2. The smallest 25W aquarium heater: Only 0.2 inches in length, the smallest 25W heater on the market. No matter how small your fish tank is, it can easily meet your needs.

3. Safe: Unlike traditional plastic seals, DaToo uses a rubber sealing layer for better sealing and safety performance, and will never leak electricity or water.

4. Durable: Quartz glass material, explosion-proof and crack-proof, more sturdy and durable, without worrying about damage.5. One Year Warranty And 24 Hours Professional Customer Service, buy With Confidence!



Select DaToo Products= Own A Private Aquarium Housekeeper.



JUST DO IT, Let’t Go!!

• 🐠25W Betta Aquarium Heater -- Creating and maintaining a perfect and comfortable water temperature for our cute fish is not easy, which requires a lot of effort. Now DaToo MINI 25W Aquarium Heater can help you make this easier. Precise and constant temperature, no need to set, keep the temperature of fish habitat in the best state at all times. You will find it very easy and happy to take care of pet fish！
• 🐠Precise And Constant Temperature -- No need to set, DaToo Fish Tank Heater will automatically keep the water temperature of the fish habitat at 78℉. This temperature is very suitable for betta and most tropical fish. When the water temperature is lower than 78℉, the heater starts to heat and the red light is on. When the temperature reaches 78℉, the heater stops heating and the green light is on. DaToo will always maintain this comfortable temperature for your beloved fish!
• 🐠The Smallest 25W Betta Heater -- For most fish lovers who have small fish tanks of 1 to 5 gallons, a small heater means more space for fish. This is the smallest 25W aquarium heater on the market, only 0.2 inches. No matter how small your fish tank is, it can be used perfectly in it, and you can't even find it. Very MINI!!
• 🐠Safe And Durable -- Unlike traditional plastic seals, DaToo uses a rubber sealing layer, which ensures that DaToo has better sealing and safety performance, and will never leak electricity or water. Quartz glass material, explosion-proof and crack-proof, more sturdy and durable, without worrying about damage.
• 🐠One Year Warranty & Satisfaction Guarantee -- This heater is ideal for 1 to 6 gallon small glass or acrylic desktop aquariums. When in use, it needs to be submerged 100% in water. We provide one year warranty and 24 hours professional customer service. Buy With Confidence!

• ★ 50W Submersible Aquarium Heater is Suitable for 3-10 Gallon.Temperature range: 65°F~93°F（18°C~34°C）, power cord is 5 FT.
• ★ LED Display Design: LED digital display, External temperature controller,easy to use and Safety.
• ★ The Digital Smart Aquarium Heater is a heater and thermometer combined into one, eliminating the need for more equipment in smaller tanks.
• ★ Please be sure that the heater needs to be completely sunk into water, horizontal or vertical fixed in the water cycle better place, and let the working light can be seen as clear as possible.
• ★ Applicable for freshwater and marine aquariums, aquaculture, glass containers, and hydroponic systems

User questions & answers

Question:	Can this be used with a 3 gal too fin dazzle
Answer:	1. Use the key Remove keyhole cover, then insert the emergency key, and turn it count clockwise. Then turn the knob (master key) clockwise to open the door. 2. Use the password 1) First open the door and install the battery. There is a red button near the hinge. 2) Press the red button. 3) Enter a password of 3-8 digits on the keyboard. 4) Press the button (E) in the bottom right corner. Your password has been set successfully. 5) Enter the password you set and press "E" to open the door
Question:	How do you adjust the temperature
Answer:	Hi, 1. First open the door and install the battery. There is a red button near the hinge. 2. Press the red button. 3. Enter a password of 3-8 digits on the keyboard. 4. Press the button (E) in the bottom right corner. Your password has been set successfully. Kind regards. Tenamic
Question:	Is there a way to lower the temperature set
Answer:	I had to melt mine to get a proper fit
Question:	Would my betas fins get stuck in the coils? I understand some designs similar to this one have killed fish
Answer:	Of course, this safe box has pre-drilled holes, and there are screws in the package, so you can easily complete the installation.

Product features

Orlushy Mini Submersible Heater

Orlushy Digital Smart Aquarium Heater, a compact submersible heater, is for small tanks. It has thermometer inside, without the need of excess equipments in small tanks. The equipped digital display is easy to set. The sensitive thermostat at the core of the oval shaped unit is excel at maintaining constant water temperature.

How to set the temperature?

1. When first powered on, the default setting of 79℉ will be displayed

2.And then the red indicator lights up, entering heating state

3. pressing the “set” button until your needed temperature is displayed

4.It is a cyclic adjustment that the set temp will vary by 1℉

5. After three times flashing on the screen, actual water temp is displayed

Note:

1. All the operation must take place after the heater is fully submerged in in water

2. If actual water temp is higher than the set temp, actual water temp will be showed and green indicator lights up

Attention:

1. The heater must be fully submerged in water, or it will cause the malfunction of the product 2. The power socket should be set higher than the sink

3. Be sure to use the heater under specified voltage

4. Make sure to unplug the power before any cleaning, maintenance or moving of the heater, and make sure it has been cooled down for at least 5 minutes

5. Do not use the heater if the power cord and plug is damaged

6. Do not insert or pull the plug with wet hands, electric shock may be caused

Application

l Orlushy heater is made of quartz glass, and the cover is plastic made, suitable for both saltwater and freshwater, durable and utility

l The heater is small in size, and can be applied in glass, plastic tank, fish bowl and square tank

Application

l Orlushy heater is made of quartz glass, and the cover is plastic made, suitable for both saltwater and freshwater, durable and utility

l The heater is small in size, and can be applied in glass, plastic tank, fish bowl and square tank

• ★【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

• 【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.

Product description

The Best 25W Mini Aquarium Heater For 3~5 Gallons Small Fish Tank



Product Features

Power: 25W

Mini Heater length only 5.3inch.

Intelligent constant temp: 75℉ - 82℉ / 24℃ - 28 ℃ (±1℃)

Fit 3 to 5 gallons small tank( fresh water and salt water)

A Free Digital Electronic Thermometer



NOTICE:

1.When in use, please make sure the heater is completely submerged in the water.



Why Do I Select DaToo 25W MINI Aquarium Heater?

1.Intelligent Temperature Constant System: Built-in DNT7 chip, can automatically constant the temperature at 75℉ - 82℉, never overheating.

2.Real-time Monitoring Of Water Temperature: A Free Digital Electronic Thermometer, waterproof and wireless, let you know the water temperature of the fish tank at any time.

3. Sturdy And Durable: Excellent engineering-grade plastic shell and MCH heating ceramic, with explosion-proof, anti-cracking and hot-proof functions, greatly improving the high temperature resistance and life of the heater.

4. Mini Size: Only 5.3 inches in length, perfect for a variety of small fish tank.

5. Safety Certifications: DaToo 25W mini aquairum heater have been certified by FCC, CE and ROHS, which means the DaToo heater has great safety performance.

6. One Year Warranty, let you select DaToo more assured.



Select DaToo Products= Own A Private Aquarium Housekeeper.



JUST DO IT, Let’t Go!!

• The Best 25W MINI Aquarium Heater For Betta: Water Temperature is a important factor that your betta is always concerned about. When winter comes, it must want you to prepare a small tank heater for it. DaToo 25 MINI Aquarium Heater Suitable for all kinds of aquarium pets, Betta, tropical fish, goldfish, ornamental fish and turtles. Mini size, Perfect Temperature Control, let your cute betta have a happy and healthy winter!
• Intelligent Temperature Constant System: Unlike other traditional fish tank heaters, DaToo 25W small aquarium heater has a built-in DTN7 intelligent chip, which can automatically maintain the temperature between 75°F and 82°F. This is the ideal temperature to keep betta healthy! And DTN7 chip can effectively prevent overheating by controlling the heater on and off, let your bettas enjoy the warm winter without any worries!!
• Real-time Monitoring Of Water Temperature: DaToo provides you with a digital electronic thermometer for free. Waterproof and wireless, you can put it completely in water. Electronic temperature display, just a quick glance, you can know the water temperature of your aquarium. Very convenient!
• Durable Materials And Safety Certifications: Excellent engineering-grade plastic shell and MCH heating ceramic, sturdy and durable, with explosion-proof, anti-cracking and hot-proof functions, greatly improving the high temperature resistance and safety of the heater. And DaToo 25W mini aquairum heater have been certified by FCC, CE and ROHS, which means the DaToo heater has great safety performance, giving your betta a safe and warm living environment!
• Perfect Size For Small Tank: DaToo heater is only 5.3 inches in length and hides perfectly in a small 3 to 5 gallon fish tank. While providing the warm water temperature for betta, it can also maintain the beauty of the aquarium. Suitable for salt water and fresh water, ideal choice for small aquariums!

User questions & answers

Question:	How do you work the free digital electronic thermometer? does it go inside the tank? what kind of battery
Answer:	Hi, this is for aquarium tank use heater, I suggest you use the heater to heat a steel or metal vat of water. Why don't you use heating kettle to get the hot water if you want bath the dog.
Question:	What kind of battery does the termometer use? Theres no information in the box
Answer:	I can only give my opinion which my not be perfect or 100% correct. I personally think I00 watt is too much for that small amount of water. I have a 50 watt in my 5.5 gal tank. Thermostatically speaking, the 100 watt should shut off anyway when it reaches your set temperature, but I am just not "feeling it" to be a good choice for that 1.5 gal. tank. Good Luck either way.
Question:	Is there a specific way to get the digital reader to work? After putting in the battery and into tank.. nothing
Answer:	Hi, plesae unplug it wait for a while, then reset it again. If it still makes noise, please contact the seller directly to ask for a replacement.

• 【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

The Marina Betta Heater is an automatic, submersible water heater that creates ideal water conditions for bettas to thrive in. The exterior is made of durable polymer, which is more resilient than traditional glass sleeve heaters. The fish aquarium heater is designed to reach and maintain a set temperature for your aquarium water; no manual adjustments required. It has a red indicator light that illuminates when the heater is working. It comes with a suction cup, so you can easily install it against the aquarium window. For more fish tank accessories check out the other Marina products including aquarium filters, filter media, aquarium heaters, aquarium air pumps, aquarium lights, aquarium thermometer, aquarium gravel, aquarium decorations, betta fish accessories, betta fish food, aquatic fake plants, betta tanks, and aquarium stands. Marina has a wide variety of products that are perfect for your pet fish or betta fish to enjoy in any large fish tank, small fish tank, freshwater tank or a saltwater tank.

• 8-watt submersible fish tank heater for aquariums up to 1.5 gallons (5 L)
• Creates ideal conditions for bettas to live in
• Made of durable polymer, which is tougher than glass
• Easy to install in your betta fish tank; use the suction cups to place on the side of the betta tank
• Automatically reaches set temperature; allowing you to easily maintain your fish aquarium
• Use in combination with the Marina Standing Thermometer (sold separately) for accurate temperature readings

User questions & answers

Question:	It seems my heater in our 1/2 gallon tank is going up to 85 degrees. Is that too hot
Answer:	It can, but heat will not be as easily distributed. If you have any further questions/concerns, please contact us at 1-888-255-4527.
Question:	Would this be okay for a very small tank that only holds 10oz-12oz water
Answer:	No.....this product does not have a thermostat.
Question:	Is there any reason that I couldn't use this outside to keep a dog's water bowl from freezing
Answer:	This is more suited for about half that a 3-5 gallon but it will still heat a 10 gallon just not very much.
Question:	Does this heater keep stable temperature? I've heard horror stories about preset heaters cooking the betta because temp went way too high
Answer:	No. The heater itself is approx. 4-1/2" long and about 2" wide.

Product features

Marina Betta Submersible Heater - 8 W

Marina Betta Heater is an automatic, submersible heater that creates ideal water conditions for bettas to thrive in. The exterior is made of durable polymer, which is more resilient than traditional glass sleeve heaters.

• 🐠【Compact Small Heater】110-120V/60HZ oval shape design little aquarium heater, fast heating for small fish tank. 50W tank heater is for 1-6.5gallon, 100W tank heater is for 6.5-13 gallon. Heater Dimension: 2.7x1.4x 4.5 inch. The power cord is 5ft, long enough for use indoors. With 2 strong suction cups at the back side of the betta heater, it's easy to install it on to glass, acrylic or plastic tank
• 🐠【External Controller】easy to set the temp on the controller, only show farenheit temp, you can set the temp range from 63℉ to 94℉, temp accuracy 1℉. Every time you set the temp, just press the button over and over until it reaches to your desired temp, then stop and wait the digit flashing for 3 times, then setting is done. Keep the controller away from water, it's not waterproof
• 🐠【Digital Display】with led display on the midle of the heater front side, when the fish tank heater is heating, there indicator light above the digit is on red, when it stop heating, the light is off. The heater with a built-in thermometer, when temp setting is done, the led will show the water temp all the time. The led will display the set temp digit only when you press the controller
• 🐠【Reliable Thermostat】this an automatic aquarium thermostat, after finishing the temp setting, you can be confidence on that it will maintain the tank water at the temp you set. The tank heater will stop heating when the water temp reaches to set temp, it will restart to heating when the water temp is 1℉ off the set temp. If the water temp is over 95℉, the heater will auto shut off and led displaying HH, it will work normally again when the water temp is lower than 95℉
• 🐠【Shut off When Out of Water】please note that this a fully submersible aquarium heater for fresh water and saltwater tank, when the top part of the heater is out of water it will auto shut off and the led displaying E1, when fully in water again it will return to normal work again

User questions & answers

Question:	I want to use this to heat a steel or metal vat of water,for bathing my dog in the garage can it heat water to 85 degrees in a large deep metal vat
Answer:	Unplug it. Plug back in and make sure it's fully covered by water. Reset by holding in the temp button
Question:	Im looking for the 50w as i have a 1.5 gallon tank but its not available. Will the 100w be too much
Answer:	The Plastic is durable, does no appear to be fiberglass filed plastic. How ever the one I purchased is sitting in a box it didn't last much more than a month. an alert message flashed and I removed it as soon as I noticed it. Replaced it with a Cobalt Neo-Therm Heater.
Question:	my heater is making a noise when heating the tank. should i take it out and replace it
Answer:	Dear customer, 78 ℉ is ≈ 26℃ , designed temperature for this heater is 15~34℃，normally, suitable temperature for betta fish is 24~30℃（75~86℉）, we suggest you ask local fish store for more details.
Question:	Is it ok for a 2.5 gallon betta tank, or will it heat up to fast and stress the Betta? (Joey
Answer:	Use the Button by the outlet side and then press it, it will start to flash press until your at the proper temp then leave it. It will adjust itself

Product features

Hygger Betta Heater Features

• Compact and small shape, with plastic guard.
• It has memory function if power failure happens.
• With 2 strong suction cups, can be replaced.
• External temp controller, easy to set the temp.
• Built-in thermometer, is sensitive in water.
• Led digital display, show water temp.
• Auto shut off when out of water, safe to use.
• Auto stop heating when water temp is higher than 95℉.

This adjustable aquarium heater can be used for almost all kinds of small fish tanks, such as square, cylinder shaped or bowl tank, tank made of glass, acrylic or plastic.

For freshwater or saltwater aquariums

This aquarium submersible heater with quartz glass heater tube, durable for use in freshwater and saltwater.

The heater plastic guard with gaps, the width is about 6-7mm, no fish can go in, so no worries for fish stuck or burned. Can protect your small turles and fish from burned.

A compact black fish tank heater, easy to be hide in tank. With 2 strong suction cups on the backside, the heater will firmly stick on to the tank, no turtles or fish can push the heater out of water.

How to use the temperature setting?

1. After you place the heater fully in water, wait for about 10 seconds, the led then will display the accurate water temp. Then you can start to set the temp.
2. Press the set button on the controller over and over, the led digits will go circularly from 63 to 94, when you get the digit you want, stop and wait the led flashing for 3 times, then the setting is done.
3. After temp setting and during the heating time, the led displays the water temp.
4. Only show farenheit temp.

When does the heater stop heating and restart heating?

When the water temp reaches to the set temp, it stops heating, at this moment the water temp may go up 1 more farenheit degree if the tank is smaller than 10 gallon.

The tank heater will restart heating when water temp is 1℉ off the set temp.

Indicator light on the heater: on red means heating, light off means stop heating.

Auto Shut Off When Out of Water

• When the heater top is out of water, it will stop heating, the led displaying E1, it means you should put the heater fully submerged.
• It will work normally again when the heater is fully in water again, it has memory function, no need extra setting.

Over Heating Protection

• When the water temp is higher than 95℉, the turtle heater will stop heating and the set button is failure, you can't do any setting on the controller, led displaying HH.
• In this case, just wait the water temp going down. The small fish tank heater will work normally again when the water temp is lower than 95℉.

Use Directions

1. Keep the heater fully submerged in water.
2. Don’t bury the heater under substrates such as gravels or sands.
3. Keep the external temp controller away form water.
4. Don’t take the heater out of water directly when it’s heating.
5. Keep water circulation as far as possible.

Product description

★Information:

Suitable for all shapes and materials fish tanks, whether it is glass or plastic, all can be used.

Dedicated designed for small and mini sized aquarium under 5 gallons, intelligent temperature regulate, very easy to use.

Suitable for all kinds of aquarium pets, tropical fish, goldfish, ornamental fish and turtles, can work in both brine and fresh water.

Your little fishes and turtles will no longer fear the winter! 2 Aquarium Decor Artificial Plants make their homes beautiful not boring.



★Attention points:

In a long-term use, please regularly clean the water grass and impurities attached on the heater surface.

The heater is completely sealed so please don't disassemble it, that will make it permanently damaged.

We freely provide 1 year quality assurance for this product, we will be responsible for any product

★It is designed to work under water only, please NOT turn it on when it's outside water, as dry burning might lead to malfunction. Please don't put it in the water if the wire or heater damaged



★Functionality :

★Material: ABS anti-scalding housing -40ºF~212ºF(-40℃~100℃), sandy quartz filler, MCH Alumina ceramic heating system

★Waterproof: IP68: 47in / 120CM indefinite waterproof

★Rated power: 25W

★Rated operating voltage: 110V - 120V

★Automatic constant temp:77℉ - 82℉ / 25℃ - 28 ℃ (±1℃)

★Security protection systems: anti-scalding surface treatment, anti-explosion, anti-cracking

Applicable volume of fish tank water: under 5 gallons or 20 liters



★Specifications:

Size: 5.3in x 1in x 0.7in / 13.5cm x 2.5cm x 1.7cm

Weight (about): 5.3oz / 150g

Package contents: 1*Mini Fish Tank Heater+ 2PCS Aquarium Decor Artificial Plant



If you want to know more details or have any questions, please check the page for more information or contact our customer service.

• Smart Control- Adopted intelligent circuit board, with a precise temperature sensing probe and constant temperature heating system. No thermometer required, no more operations: Unlike other conventional heaters, need you to manually adjust the temperature. Our Smart Aquarium Heater just plug the power cable then it will work. It works in intermittent operation mode and will automatically turn on/off to achieve the setting temperature constantly and stably, Energy-efficient.
• Easier to Use- SZELAM Mini Heater different from a manually adjusted heater. Our heater automatic temperature regulate on 73ºF-82ºF(25℃-28℃) , no need to set. Prevent electric shock and burns. Keep you and your family safe. Position it near a strong water flow for whole aquarium are in the same temperature. The outlet of filter is ideal.
• High Quality- Made by heat resistant ABS housing, sandy quartz filler and MCH Alumina ceramic heating system, anti explosion & cracking, it is scald-preventing for your pets and safe operation for you, safer and more stable to use.
• Mini Sized- Fully submersible compact betta fish heater Gift with 2PCS Aquarium Decor Artificial Plant. Specific perfect for mini aquarium under 5 gal/20L. SZELAM Mini Heater provide a constant warm for your pet fish to stay healthy, suitable both for fresh and salt water.
• Quality Assurance- This product have certificated by CE, ROHS, FCC certifications. We provide 1 year quality assurance for this product, we will provide replacement items for any product problems within 1 year after your purchase it.

User questions & answers

Question:	What are some fake cocclenny plaants
Answer:	Ideal water temp for bettas is between 78 and 80 degrees. Not 85...so ignore the people saying that's fine.
Question:	Is it okay to have heater on
Answer:	The heater is very small, but I'm not sure how big a tank that size looks. The heater is about 4 inches long and 2 inches wide.
Question:	Should I put it in while my betta and mystery snail are inside? will it heat up too quickly or was it a gradual change in temp
Answer:	To answer the original question....it depends on how low the temp dips, but I would say no. I've tried several different "devices" to keep water from freezing in cold MN winters, and most of them will fail if it gets much below 0. I'd do a search for devices that are especially made for the purpose you have. Some are quite inexpensive, and if your temps aren't too cold, will work fine, at least most of time. The only thing that works well enough to be dependable for me are heated pails, and the pail has to be pretty big, 2 to 3 gal capacity (and kept full or near full of water) to keep the liquid contents from freezing when it gets really cold. (These are the pails I have, except they're blue. I've had them for more than 10 yrs, they still work and look like new, but I ONLY use them in the winter months, they're put away and not used at all over the summer. I believe I pd about $30/ea at that time, so they've never been "cheap". https://www.amazon.com/Farm-Innovators-FB-80-Heated-Bucket/dp/B01I5JP69M/ref=sr_1_2?ie=UTF8&qid=1501103428&sr=8-2&keywords=heated+livestock+bucket. I've also taken a 5 gallon pail, cut it in half, wrapped a heat tape around the lower part of the pail, taped it in place so the tape doesn't touch itself, put the upper part of the pail over that lower half, thereby covering the heat tape on the bottom half and making it inaccessible and preserving the handle on the upper half for carrying. Then, tape the whole thing together using strong, outdoor weatherproof tape or some other means of keeping the contraption together......Viola, a 2 1/2 gallon DIY heated pail. Those worked quite well, kept the water from freezing but didn't warm the water and usually lasted as long as the heat tape did, several years if you only used them in the winter months. Since you usually have a good supply of 5 gal pails around the farm and you only needed a short heat tape, they weren't expensive to make, especially important if you had need of several pails. However, a decent heat tape isn't so inexpensive anymore nor do they seem to last as long. That, plus getting older and lazier, are the reasons we now use store-bought, ready-made heated pails.) These pails are not ideal, either, because they do such a good job, they actually warm the water, not hot, not even close, just lukewarm. While one would think that's a good thing for the dogs....warm water on a cold day....they don't like the water to be warm. They much prefer their water to be cold but do drink it warm when that's the only option. Spoiled, fussy little buggers!
Question:	If my snail or betta decide to rub on it, it wont burn them right? I need an honest answer im very attached
Answer:	No, probably not in the sense you mean. This is an eight watt "always on" type of heater, it has no thermostat. The heater will continue to emit eight watts worth of heat whenever it is plugged in. With very few exceptions all small "bowl" or "betta" heaters work this way, the only difference is the wattage. They are available in 5 to 15 watts, you need to match tank size, ambient temperature, and other variables to heater wattage. A thermometer and monitoring is essential, especially at first to determine what temperature a particular heater keeps a particular tank, and if room temperature rises so will the water temperature. The term "preset" is not really applicable to these heaters, preset heaters have a thermostat that is permanently set at a certain temperature. If a heater description uses the term preset without stating a specific temperature (usually 78°) then it is NOT a thermostatic heater- it is an always on type. In too small of a tank or too warm a room these can overheat the water. Bettas are very heat tolerant, which is why using these heaters is feasible, but care is still needed. In anything under 3 gallons I think eight watts may be more than needed unless in a fairly cool room.