12 best aquarium heater for 5 gallon tank

An aquarium heater for a 5-gallon tank is an essential piece of equipment for maintaining the proper water temperature in a small aquarium. Here's what you need to know about it:

  1. Purpose: The primary purpose of an aquarium heater is to regulate and maintain the water temperature within the optimal range for the specific fish species and aquatic life you have in your 5-gallon tank. Fish are ectothermic, meaning their body temperature depends on the surrounding water temperature.A heater helps ensure a stable and comfortable environment for them.

  2. Heating Element: Aquarium heaters typically contain a heating element that is submerged in the water. This element is responsible for generating heat and warming the water. The level of heat produced can usually be adjusted to maintain the desired temperature.

  3. Temperature Settings: It's essential to set the heater to the appropriate temperature range for the species of fish you're keeping. Different fish have different temperature preferences, so it's crucial to research and select species that are compatible with the temperature range you can maintain in your 5-gallon tank.

  4. Size and Wattage: Choosing the right-sized heater for your 5-gallon tank is crucial. Heaters come in various wattages, and it's recommended to select one that provides around 5 watts of power per gallon of water. For a 5-gallon tank, a 25-watt heater should suffice. Using an appropriately sized heater helps prevent overheating or underheating the water.

  5. Submersible Heaters: Submersible heaters are the most common type used in small aquariums like 5-gallon tanks. They are designed to be fully submerged in the water and are easy to install. Some models come with suction cups or clips to attach them to the tank's interior.

  6. Thermostat and Temperature Control: Most aquarium heaters have built-in thermostats and temperature controls. Once the desired temperature is set, the heater will automatically turn on or off to maintain that temperature. This helps prevent temperature fluctuations that can stress or harm your fish.

  7. Safety Features: Quality aquarium heaters also include safety features such as shatterproof glass or plastic housing to prevent accidents and automatic shut-off in case of overheating.

  8. Placement: Proper placement of the heater is essential. It should be fully submerged and placed near an area of water circulation, such as near a filter or air stone, to ensure even heat distribution throughout the tank.

  9. Monitoring: Regularly monitor the temperature of your 5-gallon tank using a reliable aquarium thermometer to ensure that the heater is functioning correctly and maintaining the desired temperature.

In summary, an aquarium heater for a 5-gallon tank is a critical piece of equipment for maintaining a stable and suitable environment for your fish and aquatic pets. Selecting the right-sized heater, setting the appropriate temperature, and ensuring safety and proper placement are essential steps in keeping your aquatic inhabitants healthy and comfortable.

Below you can find our editor's choice of the best aquarium heater for 5 gallon tank on the market
  

Uniclife Aquarium Heater Submersible with Thermometer, 25 Watt for 5 Gallon Fish Tank

Uniclife

Based on 154 reviews Check latest price
  • Ideal for 5-15gal fish tanks, can be installed in both fresh and saltwater.
  • Red rotatable knob on top for adjusting the temperatures between ranges of 68°F-93°F. Visible temperature displayed allows accurate temperature maintain.
  • Please notice the red indicator light is on while working, will automatically turn off when temperature reached. Carefully check external condition before use. Recommend testing before introduce to fish.
  • Water-tight with IP68 sealing workmanship. Fix the heater tightly to the tank in vertical or horizontal with 3 strong suction cups. Shatterproof 2 mm extra thick quartz glass prevents electricity leakage and scratching. Measures 8.2" x 1" (L x D)
  • Come with Uniclife aquarium heater x 1; Suction Cups x 3; stick-on thermometer x 1(The color of number will change to blue to indicate the temperature).

User questions & answers

Question: Does this device self-regulates? Meaning, if you set the temperature for 80 degrees, it will turn on and off by itself to maintain that temperature
Answer: Never received. Envelope arrived empty, amazon refunded.
Question: Ok for 2.5 gallon tank
Answer: Not sure - I have a 10
Question: Can you bury this heater under gravel? Or will it overheat because of lack of water movement
Answer: You should not bury it.
Question: Would this heater be considered as explosion proof? Thnx
Answer: You're supposed to keep the water at the indicated level to prevent explosions.

Product features

Uniclife 25W Aquarium Heater –5 Gallons

An aquarium heater is an essential device for warming water in your fish tank. HT-6025 Anti-Explosion Fish Tank Heater is suitable for up to 5 gallon aquariums, which can help your tropical fish and other aquatic pets to keep away from stress and disease by providing proper temperature. The heater will keep your tank at a constant temp especially in cold days. A good range for most fish is 76℉ to 80℉.

Easy Adjustment

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

Submersible

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

Stick-on Thermometer

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

FREESEA Aquarium Heater Fish Tank Submersible Heater (50W/75W/100W) with LED Temperature Display

Guang Zhou City Freesea Industrial Co.,Ltd

Based on 3 reviews Check latest price
  • ★ 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

FREESEA 25/50/100/200/300 Watt Aquarium Heater with Aquarium Submersible Thermometer

FREESEA

Based on 3 reviews Check latest price
  • ★【25 Watt Heater】: This Aquarium heater is suitable for 1 to 5 gallons aquariums, Length - 6.8 inch,voltage 110-120V, power cord is 4.0 ft, please choose the right wattage aquarium heater according to our size chart.
  • ★【Temperature range】: 63°F~95°F , It is very easy to adjust the temperature you need, we also deliberately give each customer a free diving thermometer, you can observe the water temperature of the fish tank at any time.
  • ★【Intelligent temperature control】: Automatic constant temperature function, when water temperature reaches to specified temperature value, heater will automatically stop heating, when water temperature is lower than the set temperature, heater will automatically start heating. Furthermore, Automatic safety shut-off feature, and overheating protection.
  • ★【Note】: 1. Aquarium heater is 100% submersible use only, during its heating time, heater must be 100% submerged into the water.,Please unplug the power supply when cleaning the fish tank or aquarium water changes. 2. Heater rod is suitable for people over 16 years of age. Children or minors should be under adult guidance or supervision.
  • ★【SATISFACTION GUARANTEED】: Gain the confidence to go hard with us! Our Aquarium Heater is built with durability in mind and safety for every design, In the remote possibility that you’re not satisfied with our product, just contact us, and we will gladly give you a new Aquarium Heater replacement. 12 Month Warranty and 24 Hour Professional After-sales Service.

User questions & answers

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

Product features

FREESEA Aquarium Submersible Heater

  • 1.Temperature range: 63°F~95°F , It is very easy to adjust the temperature you need.
  • 2.Automatic constant temperature function, when water temperature reaches to specified temperature value, heater will automatically stop heating, when water temperature is lower than the set temperature, heater will automatically start heating.

100% is submersible heater, and it should be installed on the inner side of fish tank.
100% is submersible heater, and it should be installed on the bottom of fish tank.
The water level of fish tank cannot very low, as it is easy for heater to exposed on water.
It is forbid for exposing some main body part of heater on water when using.

PULACO 25W Small Aquarium Betta Heater with Free Thermometer Strip, Under 6 Gallon Fish Tanks

PULACO

Based on 1 reviews Check latest price
  • ★【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

DaToo Mini Aquarium Heater 25W Small Fish Tank Heater 25 Watt with Free Thermometer Sticker

DaToo

Based on 413 reviews Check latest price

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!

Hygger Mini Inline Quartz Glass Aquarium Heater with External Controller, Adjustable Submersible Betta Fish Tank Thermostat 50W/100W

hygger

Based on 568 reviews Check latest price

Product description

Hygger mini quartz glass aquarium heater is specially designed for small and medium size tank use.

This fish tank heater is very safe and durable, milky quartz material made, can resist a high temp of 1800℉,

excellent in explosion-proof & shatter-resistant.

The service life can be more than 3 years if only using in fresh water.



There is a led indicator light on the temp controller.

When the tank heater is heating, the indicator light is red. When it stops heating, the light is off.



When does the heater stop and restart heating?

The aquarium heater is very reliable to maintain the water temp as your set. It will stop heating when the water

temp reaches to

the set temp and will restart heating when the temp is 1.5-2℉ below the set temp.



Over heat protection

The aquarium heater will auto shut off once the water temp is over 97℉.

How to adjust the temp?

Rotate the knob on temp controller to set it to the desired temp. Temp range is 68-90℉.





Size Chart

Power & Tank: 50W (5-15gallon) 100W (10-30gallon)

Heater Length: 5inch 7inch

If the room temp is lower than 50℉, please buy a larger wattage heater.



Do’s and Don’t’s

1. For better experience and aquarium safety, please carefully read and follow the user manual.

2. Keep the aquarium heater fully submerged in water.

3. Stick the heater horizontally or vertically onto the tank side near the water intake or on the way of water flow.

4. Don’t bury the heating rod in sand or stones.

5. Please keep the temp controller away from water.

6. Please don't connect the power before the heater is well installed.

7. Please wait the heater rod to cool down before you move the heater or change the water.



Specification:

Voltage: 110-120V

Frequency: 60HZ

Cable Length: 4.6ft



Package Includes:

1 Aquarium Heater

1 User Manual

  • 🐠 【For Fish Tank 5-15 gallon】50W aquarium heater, voltage AC110-120V 60HZ, power cord is 4.6ft. Heater rod length is 5 inch, mini compact heater for small fish tank use. Perfect for betta tank. A very compact heater, easy to hide in the tank
  • 🐠【Automatic Stop & Restart】Effectively maintain the tank water in the constant temp you set, stop heating when water temp reaches to the set temp and restart heating when the water temp is 1-2℉ below the set temp.The indicator light on the controller will be on red when it's heating, will be off when it stop heating
  • 🐠【With Built-in Thermometer】you can set the the temp from 68℉ to 90℉,temp exactness is within 2 degrees in fahrenheit. There is a built-in thermometer in the heater to detect the water temp, not need to buy seperate thermometer
  • 🐠【Durable Quartz Glass】this aquarium heater tube is heat-resistant quartz glass made, excellent in explosion-proof, can be used in fresh water and salt water aquariums, white alundum sand as the heat-conducting media, service life can be 3 years or more
  • 🐠【Fully Submersible】this fish tank heater is waterproof, must be fully submerged in water when working, place it horizontally or vertically near the water intake or where the way of water flow

User questions & answers

Question: Could I put this in a 3.5 gallon tank? Is 50W too strong for my betta fish's aquarium
Answer: 50w shouldn't be too strong. Even when I crank it up to the full 82 degrees on my five gallon (which hold 3 gallons of water) it only gets to 72 or 75 degrees max.
Question: I have this in a 5.5 gal will it burn my fish? They are algae eaters and they get close to it, will they get burnt
Answer: No mine is in a 6 gallon pico reef tank, my scooter blenny actually climbs it now and then with no problem.
Question: Can this be put in a filter
Answer: Hi, wich kind of filter you want to put the heater in? Is there are enough of water in the filter to keep the heater never out of water? Please note the 50W heater is about 5inch long.
Question: will this not work properly when inclined at 45 degree? It is switching on and off within a minute even though the water temperature is 4 degree less
Answer: It should work at any angle. I have 2 of the 50w heaters, one of them is 2 degrees “off”, it might be defective? I would attempt a return/exchange this is my favorite aquarium heater! It is the most accurate, also I use a laser temperature gauge to check the surface of the water, as some thermometer can be faulty. Maybe adjust the temperature? I know that when it was cold it was frequently turning on, also the water circulation is a factor, if you have a “still” aquarium, it makes sense that it is turning off and on and it will do so, till the temperature regulates, or generates a constant current to exchange the hot/cold water.

PGFUNNY 25W Aquarium Heater, Fish Tank Heater for Betta Smart Thermostat, Slim Design Fit 3 to 5 Gallon Tank, with Thermometer Strips

ZENGH

Based on 769 reviews Check latest price

Product description

PGFUNNY 25w Aquarium Heater, Betta Fish Heater for 3 to 5 Gallon Betta Tank Heater Fully Automatic Temperature heater with Protective Guard 

★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 3 to 5 Gallon Tank, 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.

★Attention points:

For long-term use, please regularly clean the water grass and impurities attached to the heater surface.

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

Dry burning will lead to malfunction, please put it in water totally and then plug in it. 

To protect the heater, after plug off,  please keep in water and wait 10 minutes to ensure the heater has cool totally, and then take it out.



★It is designed to work underwater 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: Nylon & Glass Fiber

★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

Package contents: 1*Mini Fish Tank Heater+ 1 fish tank thermometer sticker

PGFUNNY 25W Aquarium Heater, Fish Tank Heater for Betta Smart Thermostat,

  • 【Fully Automatic Temperature Control Chip】: Submersible Aquarium heater works in intermittent operation mode, temperature regulate between on 77℉ - 82℉, Unlike the traditional manually adjusted fish tank heaters, no need to set. and will automatically turn on/off to achieve the setting temperature constantly and stably, Energy-efficient.
  • 【Suitable for 3-5 Gallon Tank】: Fish Tank Heater 25 watt powerful and slim design fit for small fish tank. The Way of Measure Watt Heater for Your Fish Tank Needing: Watt=(Tank's Length*Wide*Water Height) /1000*2.
  • 【Advanced Materials】: sturdy engineering plastic. It has an anti-explosion, anti-scalding function, high-temperature resistance, and high safety. Suitable for aquarium pets such as turtles and fry. Length - 5.35 inch, Width - 0.9inch, Thickness - 0.63inch.
  • 【Come with Thermometer Strips】: By using the Thermometer Stripe, you will be able to monitor. An easy to identify blue color shows the current temperature of your aquarium water. Temperature Stripe is for reference only. Note: The temperature strips should stick on the outside of the fish box and level with the heater. due to the different materials of glass, the shown temperature may be delayed.
  • 【Quality Assurance】: This product fish tank heater has certificated by CE, ROHS, FCC, and UL1018. Anti-explosion, Waterproof, Scald-preventing, safe operation for pet betta fish. Working power 25w, frequency: 50/60Hz, voltage: 110-120V, waterproof rating IP68.

User questions & answers

Question: What does the red light mean? New heater, had a red light for a few minutes but then no light and the water temperature hasn’t warmed up at all
Answer: For mine, the red light means the heater is activated. When it turns off, it means the water has reached the maximum set temperature (not adjustable) of the heater, probably in the low 80s.
Question: Does this have any manufacturers warranty
Answer: I don’t recall a warranty however I used it along with enclosed Temperature gage for 3 days. When temperature never registered I returned for full refund
Question: How does the temperature sticker work? The directions are not clear
Answer: It attaches to the aquarium outside wall and highlights the water temperature
Question: What is the best location to place the heater in a square tank
Answer: I prefer to place my heaters next to the filter so that the water movement spreads the heat throughout the tank

Product features

Why Choose us?

Aquarium Heater built-in automatic temperature control chip. Automatically adjust the temperature to 25-28 degrees Celsius.Unlike the traditional manually adjusted fish tank heaters, no need to set.

Durable, explosion-proof and crack-proof, suitable for aquarium pets such as turtles and fry. The surface is protected from burns, high temperature resistance, no bursting of water, and high safety.

FREESEA Aquarium Fish Tank Heater: 50 | 100 | 300 Watt Adjustable Thermostat with 2 Suction Cups & Thermometer for Betta Tank | Saltwater Tank | Aquarium | Coral Tank

FREESEA

Based on 125 reviews Check latest price
  • ★【50Watt Heater】: This Aquarium heater is suitable for 5 to 15 gallons aquariums, Length - 6.0 inch,voltage 110-120V, power cord is 4.0 ft, please choose the right wattage aquarium heater according to our size chart.
  • ★【Temperature Range】: 64°F~93°F , It is very easy to adjust the temperature you need, we also deliberately give each customer a free diving thermometer, you can observe the water temperature of the fish tank at any time.
  • ★【Intelligent Temperature Control】: Automatic constant temperature function, when water temperature reaches to specified temperature value, heater will automatically stop heating, when water temperature is lower than the set temperature, heater will automatically start heating. Furthermore, Automatic safety shut-off feature, and overheating protection.
  • ★【High Quality】: This upgraded aquarium heater now updated for 2mm durable Quartz Glass, which is pretty shatter-proof and blast-proof and prevents electricity leakage. And the stronger protective container updated for Anti-melting anti punching double sealed material, it is scald-preventing for your pets and your safety, suitable both for fresh and salt water.
  • ★【Satisfaction Guaranteed】: Gain the confidence to go hard with us! Our Aquarium Heater is built with durability in mind and safety for every design, In the remote possibility that you’re not satisfied with our product, just contact us, and we will gladly give you a new Aquarium Heater replacement. 12 Month Warranty and 24 Hour Professional After-sales Service.

User questions & answers

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

Product features

FREESEA Aquarium Submersible Heater

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

2.Automatic constant temperature function, when water temperature reaches to specified temperature value, heater will automatically stop heating, when water temperature is lower than the set temperature, heater will automatically start heating.

100% is submersible heater, and it should be installed on the inner side of fish tank.
100% is submersible heater, and it should be installed on the bottom of fish tank.
It is forbid for exposing some main body part of heater on water when using.
The water level of fish tank cannot very low, as it is easy for heater to exposed on water.

Uniclife Aquarium Heater Submersible with Thermometer, 50 Watt for 10 Gallon Fish Tank

Uniclife

Based on 86 reviews Check latest price
  • Uniclife submersible heater, ideal for 5-15gal fish tanks, can be installed in both fresh and saltwater.
  • Red rotatable knob on top for adjusting the temperatures between ranges of 68°F-93°F. Visible temperature displayed allows accurate temperature maintain.
  • Please notice the red indicator light is on while working, will automatically turned off when temperature reached. Carefully check external condition before use. Recommend testing before introduce to fish.
  • Water-tight with IP68 sealing workmanship. Fix the heater tightly to the tank in vertical or horizontal with 3 strong suction cups. Shatterproof 2 mm extra thick quartz glass prevents electricity leakage and scratching. Measures 8.6" x 1" (L x D)
  • Come with Uniclife aquarium heater x 1; Suction Cups x 3; stick-on thermometer x 1(Color of number will change to blue to indicate the temperature).

Product features

Uniclife 50W Aquarium Heater for 5- 15 Gallons

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

Easy Adjustment

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

Submersible

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

Stick-on Thermometer

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

Betta Fish Tank Heater, 25W Mini Aquarium Heaters with 2 Artificial Plants 1 Stick-on Thermometer Strip Energy-efficient Water Warmer Temperature Controller Smart Thermostat for 3-5 Gallon Tank

ZEETOON

Based on 989 reviews Check latest price

Product description

Your little Betta Fishes will be happy with your gift for it! Great!





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



Note!

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

When there is a heater in the fish thak, do not put your hand in to the water



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 Include:

1*Mini Fish Tank Heater

2*Aquarium Decor Artificial Plant

1*Stick-on Thermometer Strip





If you want to know more details or have any questions, please Feel free to contact us.

We are always at your service.

  • Betta Fish's Favorite Gifts: ZEETOON Fish Tank Heater Suitable for all kinds of aquarium pets, Betta, 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. 1 Stick-on Thermometer Strip, Eliminate your worry of not confirming the heating temperature
  • Mini Sized- Fully submersible compact betta fish heater Gift with 2PCS Aquarium Decor Artificial Plant. Specific perfect for mini aquarium under 5 gal/20L.for all shapes and materials fish tanks, whether it is glass or plastic, all can be used. ZEETOON Mini Heater provide a constant warm for your pet fish to stay healthy, suitable both for fresh and salt water. intelligent temperature regulate, very easy to use.
  • Smart Control: Adopted intelligent circuit board, with a precise sensing probe and thermostat heating system. 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 will automatically turn on/off to achieve the setting temperature constantly and stably 73ºF-82ºF(25℃-28℃), Energy-saving life, you will be at your fingertips!
  • Smart Thermostat: ZEETOON 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. When there is a heater in the fish thak, do not put your hand in to the water
  • 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. This product have certificated by CE, ROHS, FCC, UL 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: Why can’t you put your hand into the aquarium when there’s a heater in it
Answer: The three plastic plants that come with the heater are a green grass a purple orcid style and and a red flowering plant
Question: I have a 6.5 gallon tank. Can I use 2 of these, or would 1 be sufficient
Answer: I do. I have a tank thermometer a few inches from it and it regulates between 78 and 82 degrees Fahrenheit. It will kick on and shut off on it's own
Question: Can u leAve it on all night
Answer: Yes, you can attach it to the inside wall of the aquarium with your fish & snail. Be sure it’s fully submerged before you plug it in. It heats up gradually, and my beta loves it!
Question: The stick on thermometer is it in Celsius or Farenhite
Answer: My Betta loves to curl up around the top of it. It works great! Has never harmed my Better or my snails.

PULACO 25W Mini Aquarium Heater, Betta Fish Tank Heater for 1-5 Gallon Small Fish Tanks

PULACO

Based on 90 reviews Check latest price
  • ★【Quartz glass heater】: The heating device is made of heat-resistant quartz glass, explosion-proof and strong thermal conductivity. It can be used for 1-5 gallon glass or acrylic fish tanks.
  • ★【Easy to operate】: This heater is different from traditional heaters. It is designed with an external controller for temperature display and temperature adjustment, which can freely adjust the temperature you need (68°F-93°F).
  • ★【Intelligent temperature control】: The heater effectively maintains the temperature you preset before, and stops heating when the water temperature reaches the preset temperature, and restarts heating when the water temperature is lower than the preset temperature by 2-3°F.The red light on the LED screen indicates that the heater is heating, and the blue light indicates that the heater has finished heating and is in a constant temperature state.
  • ★【Note】: The heater needs to be fully submerged, the external controller is not waterproof, and children need to be used under the supervision or guidance of adults.
  • ★【SATISFACTION GUARANTEED】Our Aquarium Heater is built with durability in mind and safety for every design. In the remote possibility that you’re not satisfied with our product, just contact us, and we will gladly give you a new Aquarium Heater replacement. 12 Month Warranty and 24 Hour Professional After-sales Service.

User questions & answers

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

Product features

How to use the external controller:

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

Maintenance:

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

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

Cautions:

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

External Controller

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

Quartz glass heater

The heating device is made of heat-resistant quartz glass

Suction cup

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

Specification

Power : 25Watt

Voltage: 110-120V/60HZ

Cable Length: 5.0 ft

Orlushy Mini Aquarium Heater 50W,Small Fish Tank Heaters with LED Digital Temperature Display and External Temperature Controller for Betta Frogs Newts Turtles (50W)

Nova pet supplies co.LTD

Based on 2 reviews Check latest price
  • ★ 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

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