25 Best Mini Aquarium Heaters for February 2021

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FREESEA 50W Mini Aquarium Heater Fish Tank Submersible Heater with LED Temperature Display
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FREESEA 50W Mini Aquarium Heater Fish Tank Submersible Heater with LED Temperature Display

by Guang Zhou City Freesea Industrial Co.,Ltd
What We like

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

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Product Features

  • Temperature range: 59F~94F, 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.
  • Note:this heater is 100% submersible use only, during its heating time, heater must be 100% submerged into the water.

Note:this heater is 100% submersible use only, during its heating time, heater must be 100% submerged into the water. 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. temperature range: 59f~94f, display fahrenheit f, this heater is designed for1~10 gallons tank.

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hygger 50W Mini Inline Quartz Glass Aquarium Heater with External Controller, Adjustable Submersible Betta Fish Tank Thermostat for 5-15 Gallon
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hygger 50W Mini Inline Quartz Glass Aquarium Heater with External Controller

Adjustable Submersible Betta Fish Tank Thermostat for 5-15 Gallon

by hygger
What We like

For Fish Tank 5-15 gallon50W 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

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Product Features

  • Durable Quartz Glassthis 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
  • Automatic Stop & RestartEffectively 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
  • Fully Submersiblethis 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
  • With Built-in Thermometeryou 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

Automatic stop & restarteffectively 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 Durable quartz glassthis 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 With built-in thermometeryou 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 Fully submersiblethis 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

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auomii Mini Submersible Aquarium Heater, 50W/100W Small Fish Tank Heater, Built-in Thermometer, 2 LED Temperature Display, External Temperature Controller, Intelligent Frequency Conversion (100W)
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auomii Mini Submersible Aquarium Heater

50W/100W Small Fish Tank Heater, Built-in Thermometer, 2 LED Temperature Display, External Temperature Controller, Intelligent Frequency Conversion (100W)

by auomii
What We like

Safety and Reliable3 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

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Product Features

  • 30days refund 12 months replacementYour 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
  • Small Size Heater AUOMII 100W small size aquarium heater is suitable for 5~20 gallon mini fish tanks, and easy to hide in the tank. Temperature can be accurately adjusted from 64~93F. 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
  • Accuracy is up to 1Temperature accuracy is up to 1 as advanced Intelligent Frequency Conversion Technology. If the temperature is lower than the target value of 0.2F, 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 1F , the heater will work at full power. The temperature curve is almost a line

30days refund 12 months replacementyour 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 Small size heater auomii 100w small size aquarium heater is suitable for 5~20 gallon mini fish tanks, and easy to hide in the tank. temperature can be accurately adjusted from 64~93f. 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 Accuracy is up to 1temperature accuracy is up to 1 as advanced intelligent frequency conversion technology. if the temperature is lower than the target value of 0.2f, 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 1f , the heater will work at full power. the temperature curve is almost a line

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Small Size Submersible Aquarium Heater, Intelligent Frequency Conversion, Mini Fish Tank Heater 50W 100W with Built-in Thermometer, LED Temperature Display, External Temperature Controller (50W)
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YukiHalu Small Size Submersible Aquarium Heater

Intelligent Frequency Conversion, Mini Fish Tank Heater 50W 100W with Built-in Thermometer, LED Temperature Display, External Temperature Controller (50W)

by YukiHalu
What We like

Easy to Read & Built-in ThermometerDual 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.

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Product Features

  • 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 93F. This heater suitable for both saltwater and freshwater. The rated voltage is 100-130V.
  • 1 Accuracy & Intelligent Frequency ConversionThanks to advanced Intelligent Frequency Conversion Technology, the temperature accuracy is up to 1. If the temperature is lower than the target value of 0.2F, the heater works at a Variable frequency to keep the temperature constant. If the water temperature is lower than the target temperature of 1F, 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 handsThe 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 adjust the temperature without wet your handsthe 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. 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 93f. this heater suitable for both saltwater and freshwater. the rated voltage is 100-130v. 1 accuracy & intelligent frequency conversionthanks to advanced intelligent frequency conversion technology, the temperature accuracy is up to 1. if the temperature is lower than the target value of 0.2f, the heater works at a variable frequency to keep the temperature constant. if the water temperature is lower than the target temperature of 1f, the heater will work at full power. compare to traditional heater, this new technology will cut down 49% electricity bill for you.

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AQQA Mini Submersible Aquarium Heater 15W,79℉(26℃) Constant Temperature Intelligent Automatic Heating,Small Fish Tank Heater with LED Light,for Freshwater and Saltwater (25W)
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AQQA Mini Submersible Aquarium Heater 15W

79℉(26℃) Constant Temperature Intelligent Automatic Heating, Small Fish Tank Heater with LED Light, for Freshwater and Saltwater (25W)

by AQQA
What We like

Mini size,perfect for small fish tanks3.3 x 2.2 x 0.8 inch Super small,but powerful.All the heating tubes are in the insulating material.Prevent the heater from being too hot and the fish from being scalded.The heating tube is not exposed and explosion-proof carbon heater,it is very safe that no small fish can touch the heating tube.

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Product Features

  • Dry burning-resistant protection and over temperature protectionWhen temperature passes 97(36),the heater will shut off automatically.When the heater is exposed to air, the heater shuts off automatically.heater heating 30 minutes, the heater stops for 3 minutes; the red led light flashes twice every 9 seconds.
  • Different lights have different meaningsThe red lights represent heater is on heating,red LED light flashes rapidly represent the heater is exposed to air, the green light represent the temperature of the water is higher than 79( 26) heating will stop.the green LED light flashes quickly represent temperature passes 97(36).
  • Intelligent automatic heatingconstant temperature 79(26)Keep the water temperature at 79(26),the most comfortable temperature for the fish.When the water is lower than 77 (25) the heater turn on and heat the water,If the water is higher than 79(26) the heating will shut off.

Intelligent automatic heatingconstant temperature 79(26)keep the water temperature at 79(26),the most comfortable temperature for the fish.when the water is lower than 77 (25) the heater turn on and heat the water,if the water is higher than 79(26) the heating will shut off. Dry burning-resistant protection and over temperature protectionwhen temperature passes 97(36),the heater will shut off automatically.when the heater is exposed to air, the heater shuts off automatically.heater heating 30 minutes, the heater stops for 3 minutes; the red led light flashes twice every 9 seconds. Different lights have different meaningsthe red lights represent heater is on heating,red led light flashes rapidly represent the heater is exposed to air, the green light represent the temperature of the water is higher than 79( 26) heating will stop.the green led light flashes quickly represent temperature passes 97(36).

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DaToo 10 Watt Small Aquarium Heater Mini Betta Flat Fish Tank Heater for 1 Gallon 1.5 Gallon
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DaToo 10 Watt Small Aquarium Heater Mini Betta Flat Fish Tank Heater for 1 Gallon 1.5 Gallon

by DaToo
What We like

PTC HEATING & ONLY SUITABLE FOR FRESHWATER - Unlike conventional glass aquarium heaters, PTC has better thermal conductivity and heating rate, no explosion, no breakage. Very energy efficient and environmentally friendly. Your child can operate it easily and is very safe. This mini fish tank heater is only suitable for fresh water tanks.

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Product Features

  • PERFECT MINI HEATER FOR 1~1.5 GALLON TANK - For a Betta breeder with a 1 to 1.5 gallon small tank, it is very difficult to choose a suitable heater. Because most of the heaters on the market are too big for this small tank. This not only affects us to watch our beautiful Betta, but also reduces the activity space of the Betta. Now DaToo Mini Aquarium heater can help you solve this problem. Ultra-small and thin size, perfectly hidden in a 1~1.5 gallon tank, your Betta will be happy with it! !
  • 24V SAFE VOLTAGE & POWER OFF AFTER LEAVING WATER - The output voltage of the DaToo Betta Heater is only 24V, which not only ensures the safety of the fish, but also ensures the safety of the user. No need to worry about leakage, you can rest assured to use it for your children. The Betta heater needs to be completely submerged in the water. If it leaves the water, it will automatically stop heating to prevent dry burning (heating indicator is green), which is very safe.
  • CONSTANT TEMPERATURE & NO NEED TO ADJUST - DaToo 10W MINI Aquarium Heater can automatically maintain a constant temperature between 75F and 82F (depending on the external environment), no need to set. This temperature range is ideal for most tropical fish and is very beneficial for the reproduction of betta and promotes their metabolism. With no extra work, just plug it in and the DaToo 10Watt Small Fish Tank Heater will help your fish stay healthy and comfortable. Great for kids!!

Perfect mini heater for 1~1.5 gallon tank - for a betta breeder with a 1 to 1.5 gallon small tank, it is very difficult to choose a suitable heater. because most of the heaters on the market are too big for this small tank. this not only affects us to watch our beautiful betta, but also reduces the activity space of the betta. now DaToo mini aquarium heater can help you solve this problem. ultra-small and thin size, perfectly hidden in a 1~1.5 gallon tank, your betta will be happy with it! ! 24v safe voltage & power off after leaving water - the output voltage of the DaToo betta heater is only 24v, which not only ensures the safety of the fish, but also ensures the safety of the user. no need to worry about leakage, you can rest assured to use it for your children. the betta heater needs to be completely submerged in the water. if it leaves the water, it will automatically stop heating to prevent dry burning (heating indicator is green), which is very safe. Constant temperature & no need to adjust - DaToo 10w mini aquarium heater can automatically maintain a constant temperature between 75f and 82f (depending on the external environment), no need to set. this temperature range is ideal for most tropical fish and is very beneficial for the reproduction of betta and promotes their metabolism. with no extra work, just plug it in and the DaToo 10watt small fish tank heater will help your fish stay healthy and comfortable. great for kids!!

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

25W Mini Aquarium Heaters Free 2 Artificial Plants 1 Stick-on Thermometer Strip 2 Suction Cups, Water Warmer Temperature Controller Smart Thermostat for 3-5 Gallon Tank

by ZEETOON
What We like

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.

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Product Features

  • Smart Thermostat: ZEETOON Mini Heater different from a manually adjusted heater. Our heater automatic temperature regulate on 73F-82F(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.
  • 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 73F-82F(25-28), Energy-saving life, you will be at your fingertips!
  • 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

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 73f-82f(25-28), energy-saving life, you will be at your fingertips! 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. Smart thermostat: ZEETOON mini heater different from a manually adjusted heater. our heater automatic temperature regulate on 73f-82f(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 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

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hygger 50W Mini Submersible Digital Display Aquarium Heater for Small Fish Tank, Compact and Fast Heating Thermostat, with External Controller and Built-in Thermometer, for Betta, Turtle
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hygger 50W Mini Submersible Digital Display Aquarium Heater for Small Fish Tank

Compact and Fast Heating Thermostat, with External Controller and Built-in Thermometer, for Betta, Turtle

by hygger
What We like

Compact Small Heater110-120V/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

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Product Features

  • External Controllereasy 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
  • Reliable Thermostatthis 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
  • Digital Displaywith 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
  • Shut off When Out of Waterplease 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

External controllereasy 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 Reliable thermostatthis 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 Digital displaywith 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 Shut off when out of waterplease 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

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VIVOSUN Submersible Aquarium Heater 50W Mini Fish Tank Heaters with Intelligent LED Temperature Display and External Temperature Controller
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VIVOSUN Submersible Aquarium Heater 50W Mini Fish Tank Heaters with Intelligent LED Temperature Display and External Temperature Controller

by VIVOSUN
What We like

EXTERNAL TEMPERATURE CONTROLLER: The touch-button controller adjusts the temperature without getting your hands wet. Its easy to control the temp from 68/20C to 94/34C; Check the size chart to find your desired fish tank heater

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Product Features

  • MINIATURIZED WITH GREAT EFFECT: With a size of 12.5 (H) x 6.5 (W) this aquarium heater is compact and wont take up much space and is easy to hide; Whether your tank is 3 gallons or 60 gallons, youll find a use for VIVOSUNs aquarium heater
  • LOW WATER LEVEL HEATING: This product is 1.2 thick, which means it can operate in water levels of the same height; Its perfect for 3 to 5 gallon tanks, but also works with much bigger aquariums; Be sure to match the power to the aquarium dimensions
  • THERMOSTAT HEATING SYSTEM: The VIVOSUN aquarium heater can control water temperature up to your desired temp value and will automatically control the water temp as needed; Your fish, turtles, frogs, or other little pets will spend a warm winter with this aquarium heater

Thermostat heating system: the VIVOSUN aquarium heater can control water temperature up to your desired temp value and will automatically control the water temp as needed; your fish, turtles, frogs, or other little pets will spend a warm winter with this aquarium heater Low water level heating: this product is 1.2 thick, which means it can operate in water levels of the same height; its perfect for 3 to 5 gallon tanks, but also works with much bigger aquariums; be sure to match the power to the aquarium dimensions Miniaturized with great effect: with a size of 12.5 (h) x 6.5 (w) this aquarium heater is compact and wont take up much space and is easy to hide; whether your tank is 3 gallons or 60 gallons, youll find a use for VIVOSUNs aquarium heater

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MQ Mini Aquarium Heater 25W Betta Fish Tank Heater with Digital LED Display and External Thermostat Controller, for Fish Tank 3-5 Gallon
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MQ Mini Aquarium Heater 25W Betta Fish Tank Heater with Digital LED Display and External Thermostat Controller

for Fish Tank 3-5 Gallon

by MQ
What We like

Durable Aquarium Heater - This aquarium heater is made of premium thickened Quartz Glass, double seal material, advanced design to ensure safe operation. It has explosion-proof function while being also shatterproof and waterproof.

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Product Features

  • It will stop heating when the water temp reaches to the set temp, restart heating when the water temp is 4 less than the set temp. The heater is working when the indicator light is red.
  • Intelligent Temperature Control - It can ensure the temperature constant at the set point as it can adjust heating power automatically if there is any water temperature variation. So that it can avoid temperature mutation and protect fishes.
  • Wide Temperature Range - The temperature of the heater can be adjusted between 20-34, 68-94F. It is suitable for fresh or sea water and great for many kinds of aquariums, fishes and amphibious turtles.
  • Easy Viewing and Safe Adjusting - It is easy and safe to adjust temperature by the external controller and the temperature will be shown on the LED screen of the heater.

Wide temperature range - the temperature of the heater can be adjusted between 20-34, 68-94f. it is suitable for fresh or sea water and great for many kinds of aquariums, fishes and amphibious turtles. Easy viewing and safe adjusting - it is easy and safe to adjust temperature by the external controller and the temperature will be shown on the led screen of the heater. It will stop heating when the water temp reaches to the set temp, restart heating when the water temp is 4 less than the set temp. the heater is working when the indicator light is red. Intelligent temperature control - it can ensure the temperature constant at the set point as it can adjust heating power automatically if there is any water temperature variation. so that it can avoid temperature mutation and protect fishes.

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hygger Explosion-Proof Carbon Mini Submersible Aquarium Heater, 25W Small Heater with Over-Temperature Protect,Turtle and Betta Tank Heater with Digital Display External Controller
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hygger Explosion-Proof Carbon Mini Submersible Aquarium Heater

25W Small Heater with Over-Temperature Protect, Turtle and Betta Tank Heater with Digital Display External Controller

by hygger
What We like

SAFE AND ANTI-BURN: The nichrome alloy heating materials has higher thermal energy efficiency, and then conducts heat through carbon material, which effectively utilizes electrical energy to convert into thermal energy, with long service life and uniform heating. The exterior is made of special nylon material, fireproof material, safe explosion-proof and anti-burn,and there is no safety problem.

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Product Features

  • MINI NOT TAKE UP SPACE: It can be installed horizontally or vertically. is also for saltwater & freshwater, and it can be used in various small turtle and fish tanks such as Betta, Angelfish,Guppy,Swordfish,Marie fish tanks, which can fully meet your needs. Note: Do not put the heater in the sand.Please make sure that the water surface is at least 2 inch above the heater.
  • PRODUCT PARAMETERS: Voltage:110-120V/60Hz; Cord length:4.3ft; Temp Accuracy:2; / conversion:Long press the set button can automatically conversion; Over-temp:Temp above 97(36), heater will shut off automatically; Control Range:68~94; Dimension:3.5 x 2 x 0.8 inch.
  • OVER TEMPERATURE PROTECTION: Intelligent induction device, stable work, good performance, over-temperature protection, avoid cooking fish due to high temperature. When temp pass 97(36),the LED display showsE2, the heater will shut off automatically. And automatic constant temperature function.
  • DIGITAL DISPLAY & EXTERNAL CONTROLLER: Easy to use, LED digital display, adjustable external temperature, can be set between 68~94, easy to know the real-time temperature. The working status can also be displayed, Red light on: Heating, Blue light on: Constant Temperature. PS:Press one time adds one degree.Long press for three seconds to switch between Celsius () and Fahrenheit().

Mini not take up space: it can be installed horizontally or vertically. is also for saltwater & freshwater, and it can be used in various small turtle and fish tanks such as betta, angelfish,guppy,swordfish,marie fish tanks, which can fully meet your needs. note: do not put the heater in the sand.please make sure that the water surface is at least 2 inch above the heater. Product parameters: voltage:110-120v/60hz; cord length:4.3ft; temp accuracy:2; / conversion:long press the set button can automatically conversion; over-temp:temp above 97(36), heater will shut off automatically; control range:68~94; dimension:3.5 x 2 x 0.8 inch. Digital display & external controller: easy to use, led digital display, adjustable external temperature, can be set between 68~94, easy to know the real-time temperature. the working status can also be displayed, red light on: heating, blue light on: constant temperature. ps:press one time adds one degree.long press for three seconds to switch between celsius () and fahrenheit(). Over temperature protection: intelligent induction device, stable work, good performance, over-temperature protection, avoid cooking fish due to high temperature. when temp pass 97(36),the led display showse2, the heater will shut off automatically. and automatic constant temperature function.

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9
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Orlushy Mini Aquarium Heater 100W,Small Fish Tank Heaters with LED Digital Temperature Display and External Temperature Controller for Betta Frogs Newts Turtles(100W)
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Orlushy Mini Aquarium Heater 100W

Small Fish Tank Heaters with LED Digital Temperature Display and External Temperature Controller for Betta Frogs Newts Turtles(100W)

by Nova pet supplies co.LTD
What We like

LED Display Design: LED digital display, External temperature controller,easy to use and Safety.

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Product Features

  • Applicable for freshwater and marine aquariums, aquaculture, glass containers, and hydroponic systems .
  • The Digital Smart Aquarium Heater is a heater and thermometer combined into one, eliminating the need for more equipment in smaller tanks.
  • 100W Submersible Aquarium Heater is Suitable for 10-20 Gallon.Temperature range: 65F~93F18C~34C, power cord is 5 FT.
  • 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.

100w submersible aquarium heater is suitable for 10-20 gallon.temperature range: 65f~93f18c~34c, power cord is 5 ft. applicable for freshwater and marine aquariums, aquaculture, glass containers, and hydroponic systems . 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. the digital smart aquarium heater is a heater and thermometer combined into one, eliminating the need for more equipment in smaller tanks.

13
8.9
SCORE
Hygger Mini Glass Aquarium Heater Adjustable LED Digital Temperature Display Small Tank Heater for Turtle Betta Fish Bowl with Protective Guard 50W
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Hygger Mini Glass Aquarium Heater Adjustable LED Digital Temperature Display Small Tank Heater for Turtle Betta Fish Bowl with Protective Guard 50W

by hygger
What We like

For Fish Tank 1-6.5 Gallon50 watt aquarium heater is ideal for small fish bowls and aquariums 1 to 6.5 gallons; voltage/frequency: 110 120volt/60hertz; it is ideal for betta fish and turtle tank

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Product Features

  • Easy to Read LED DisplayExternal temperature setting control avoids getting hands wet, digital LED display shows real time water temperature. Heating temperature range from 63 to 94F. Control accuracy is +/- 1F.
  • Run Dry ProtectionThis egg-shaped small aquarium heater automatically shut itself off once it remove from water which ensures the safety of your pet, especially turtle and frog
  • Protective GuardMade of high quality quartz glass, waterproof double seal material, covered with protective case, shatter-resistant construction, this fish tank heater keep your fish from scalding and punching
  • Automated Shut Off SystemOnce set the desired temperature, this fully submersible heater lights on red indicates that it is heating. It will auto shut off once it reach set temperature

Automated shut off systemonce set the desired temperature, this fully submersible heater lights on red indicates that it is heating. it will auto shut off once it reach set temperature Run dry protectionthis egg-shaped small aquarium heater automatically shut itself off once it remove from water which ensures the safety of your pet, especially turtle and frog Protective guardmade of high quality quartz glass, waterproof double seal material, covered with protective case, shatter-resistant construction, this fish tank heater keep your fish from scalding and punching Easy to read led displayexternal temperature setting control avoids getting hands wet, digital led display shows real time water temperature. heating temperature range from 63 to 94f. control accuracy is +/- 1f.

14
8.8
SCORE
hygger Mini Betta Tank Heater for Small Fish Bowl 50W Aquarium Heater with LED Digital Display 6-9 Gallon Tank 68°F to 94°F
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hygger Mini Betta Tank Heater for Small Fish Bowl 50W Aquarium Heater with LED Digital Display 6-9 Gallon Tank 68°F to 94°F

by hygger
What We like

Build-in thermostat on the cord, this small fish heater can be easily adjusted temperature without getting your hands wet. The precision temperature control allows you to set the temperature between 68 and 94 degrees F in 2-degree increments

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Product Features

  • 50 watt aquarium heater is ideal for 6-9 gallon fish bowls, small freshwater and saltwater aquariums, betta tank, snail tank and turtle tank
  • Betta Heater auto shut off when over-heats temperature over 97 degree Fahrenheit and flashing error code "E2". The nylon integrated fish guard prevents fish from scald and punching. Carbon heating element is more stable and safer than tranditional coil material
  • Bright, clear LCD display that shows real-time water temperature over guesswork is a big bonous, display in either Celsius or Fahrenheit, depending on your choice. Red indicator light indicates the heater is working and turns into blue once it reach to desired temperature
  • Fully-submersible heater by Hygger is easy to install with included suction cups and slim profile, super tiny size just measures 3.5 in x 2 in x 0.8 in, can easily be wedged in a corner, great for small or partially filled tank

Betta heater auto shut off when over-heats temperature over 97 degree fahrenheit and flashing error code "e2". the nylon integrated fish guard prevents fish from scald and punching. carbon heating element is more stable and safer than tranditional coil material Bright, clear lcd display that shows real-time water temperature over guesswork is a big bonous, display in either celsius or fahrenheit, depending on your choice. red indicator light indicates the heater is working and turns into blue once it reach to desired temperature 50 watt aquarium heater is ideal for 6-9 gallon fish bowls, small freshwater and saltwater aquariums, betta tank, snail tank and turtle tank Fully-submersible heater by hygger is easy to install with included suction cups and slim profile, super tiny size just measures 3.5 in x 2 in x 0.8 in, can easily be wedged in a corner, great for small or partially filled tank

15
8.7
SCORE
DaToo Mini Aquarium Heater 25W Small Fish Tank Heater 25 Watt with Free Thermometer Sticker
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DaToo Mini Aquarium Heater 25W Small Fish Tank Heater 25 Watt with Free Thermometer Sticker

by DaToo
What We like

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

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Product Features

  • 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.
  • 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!!
  • 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. 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!

16
8.6
SCORE
SZELAM 25W Smart Mini Aquarium Heater,Betta Fish Tank Heater Thermostat Warmer Submersible Anti-Explosion/Energy-efficient Water Temp Controller-2 Artificial Plants Include
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SZELAM 25W Smart Mini Aquarium Heater

Betta Fish Tank Heater Thermostat Warmer Submersible Anti-Explosion/Energy-efficient Water Temp Controller-2 Artificial Plants Include

by SZELAM
What We like

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.

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Product Features

  • Easier to Use- SZELAM Mini Heater different from a manually adjusted heater. Our heater automatic temperature regulate on 73F-82F(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.
  • 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.
  • 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.

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. 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. 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 73f-82f(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.

17
8.6
SCORE
NICREW Mini Submersible Aquarium Heater, Digital Temperature Display Fish Tank Heater with Adjustable External Controller, Suitable for Freshwater & Saltwater Tank up to 40 Gallon, 150W
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NICREW Mini Submersible Aquarium Heater

Digital Temperature Display Fish Tank Heater with Adjustable External Controller, Suitable for Freshwater & Saltwater Tank up to 40 Gallon, 150W

by NICREW
What We like

Safe and easy to use external controller help operate without getting hands wet, allow Celsius and Fahrenheit control from 68/20C to 94/34C

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Product Features

  • Ideal for freshwater and saltwater aquariums, aquaculture, glass containers, and hydroponic systems
  • Automatically shut off will be activated if heater is no longer properly submerged, preventing damage
  • 150 watts heater is designed for 30-40 gallon fish tanks
  • Equipped with precise temperature probe, making the temperature difference within 2F to provide ideal living environment for your aquariums

150 watts heater is designed for 30-40 gallon fish tanks Automatically shut off will be activated if heater is no longer properly submerged, preventing damage Ideal for freshwater and saltwater aquariums, aquaculture, glass containers, and hydroponic systems Equipped with precise temperature probe, making the temperature difference within 2f to provide ideal living environment for your aquariums

18
8.6
SCORE
Basiney Mini Aquarium Heater 150W Fish Tank Heater for Betta Fish Turtle Tank Up to 20 Gallon
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Basiney Mini Aquarium Heater 150W Fish Tank Heater for Betta Fish Turtle Tank Up to 20 Gallon

by Basiney
What We like

U-picks mini aquarium heaters can warm up these fish tank in the winter and provide warm water for you fish,"ADD TO CART NOW "Let your fish play happily in the warm water.

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Product Features

  • However, the cold winter, want to maintain a constant temperature will be difficult without human intervention
  • But,if human intervention,you can see achieving such temperature is not hard as there are U-picks heaters you could use for your aquarium starting today.
  • Note: make sure to learn more about the type of fish you have before setting the temperature.The heater temperature can be adjusted as needed, the ceiling was set to 90 degrees.
  • Fish just like humans would like to be in an environment that is within a certain temperature range. For most fish, the optimum temperature is around 73 to 82 degrees.

However, the cold winter, want to maintain a constant temperature will be difficult without human intervention But,if human intervention,you can see achieving such temperature is not hard as there are u-picks heaters you could use for your aquarium starting today. Note: make sure to learn more about the type of fish you have before setting the temperature.the heater temperature can be adjusted as needed, the ceiling was set to 90 degrees. Fish just like humans would like to be in an environment that is within a certain temperature range. for most fish, the optimum temperature is around 73 to 82 degrees.

19
8.5
SCORE
AQQA 15W 25W 35W Aquarium Mini Submersible Heater for Small Fish Tank (15W for 0-2 Gallon Tank)
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AQQA 15W 25W 35W Aquarium Mini Submersible Heater for Small Fish Tank (15W for 0-2 Gallon Tank)

by AQQA
What We like

EASY INSTALLATION: Easy and quick installation, submersible fish tank heater, vertical or horizontal placement using attached 2 suction cups. NOTE: Please make sure that the heater is completely submerged in the water before turning on the power, and install it near the water flowing area to prevent uneven heating

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Product Features

  • SAFE& DURABLE: Mini fish tank heaters made of high quality flameresistance, double seal material, providing explosion-proof, shatterproof, IP68 waterproof, much safer for human and your lovely fishes, your pets will no longer fear the winter
  • TRIPLE SECURITY PROTECTION: When the heater exposed to air and is not fully submerged, then the red light flashes quickly and shut off automatically. When the temperature exceeds 97(36), the green light flashes quickly, the heater will shut off automatically. Sensor open-circuited, red and green lights flash alternately, stop working
  • INTELLIGENT AUTOMATIC HEATING: Automatic constant temperature function, intelligent constant temperature controller. If your heater is working properly, the red light will be constant on. When the temperature is reached 79(26), it will stop work, the green light will be constant on

Safe& durable: mini fish tank heaters made of high quality flameresistance, double seal material, providing explosion-proof, shatterproof, ip68 waterproof, much safer for human and your lovely fishes, your pets will no longer fear the winter Triple security protection: when the heater exposed to air and is not fully submerged, then the red light flashes quickly and shut off automatically. when the temperature exceeds 97(36), the green light flashes quickly, the heater will shut off automatically. sensor open-circuited, red and green lights flash alternately, stop working Intelligent automatic heating: automatic constant temperature function, intelligent constant temperature controller. if your heater is working properly, the red light will be constant on. when the temperature is reached 79(26), it will stop work, the green light will be constant on

20
8.5
SCORE
PULACO 25W Mini Aquarium Heater, Betta Fish Tank Heater for 1-5 Gallon Small Fish Tanks
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PULACO 25W Mini Aquarium Heater

Betta Fish Tank Heater for 1-5 Gallon Small Fish Tanks

by PULACO
What We like

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 (68F-93F).

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Product Features

  • 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 2-3F.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.
  • 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.
  • 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.

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 2-3f.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. 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.

21
7.9
SCORE
Aqueon Fish Tank Mini Heater, 10-watt, Plastic
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Aqueon Fish Tank Mini Heater

10-watt, Plastic

by Central Garden & Pet
What We like

Features thermal safety shut-off

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Product Features

  • Perfect size heater for Aqeuon Mini Bows and other small aquariums
  • Ideal for desktop fish tank aquariums up to 5 gallons
  • Aquarium heater is shatterproof

Ideal for desktop fish tank aquariums up to 5 gallons Perfect size heater for aqeuon mini bows and other small aquariums Aquarium heater is shatterproof

22
7.9
SCORE
Marina Submersible Aquarium Heater, Betta Fish Tank Heater, 25-Watt, 11230
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Marina Submersible Aquarium Heater

Betta Fish Tank Heater, 25-Watt, 11230

by Marina
What We like

Includes bracket with suction cups for easy, secure installation

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Product Features

  • 25-Watt submersible heater for freshwater or saltwater aquariums
  • Bumper guard to protect fish
  • Impact-resistant glass design; waterproof sealing
  • Easy to read temperature settings

Easy to read temperature settings Bumper guard to protect fish Impact-resistant glass design; waterproof sealing 25-watt submersible heater for freshwater or saltwater aquariums

23
7.6
SCORE
Marina Betta Fish Submersible Heater for Fish Tank Aquarium, 1.5 gallons, 11182
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AquaClear Marina Betta Fish Submersible Heater for Fish Tank Aquarium

1.5 gallons, 11182

by Marina
What We like

Automatically reaches set temperature; allowing you to easily maintain your fish aquarium

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Product Features

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

8-watt submersible fish tank heater for aquariums up to 1.5 gallons (5 l) Easy to install in your betta fish tank; use the suction cups to place on the side of the betta tank Made of durable polymer, which is tougher than glass Creates ideal conditions for bettas to live in Use in combination with the Marina standing thermometer (sold separately) for accurate temperature readings

24
7.4
SCORE
Orlushy 100W Mini Submersible Aquarium Heater with External Temp Controller and Built-in Thermometer for Small Fish Tank
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Orlushy 100W Mini Submersible Aquarium Heater with External Temp Controller and Built-in Thermometer for Small Fish Tank

by NOVA
What We like

External controller: This heater is designed to be the external controller, and users can change the temperature without having to get your hands wet or without having to take the heater out of the aquarium, providing great convenience

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Product Features

  • Adjustable Temp: To set the desired temperature ranging from 65-93by pressing the "set" button, cyclic adjustment, stabilizing the target temperature and small in temp exactness, without worries about what the temperature really is
  • 100 Watt Aquarium Heater: For 10-30 gallons fish tank, 50W aquarium heater, voltage 110V, power cord 5(ft), the temp can be set to the values ranging from 65 to 93F, please choose the right wattage aquarium heater according to our size chart
  • Application: The heater must be fixed fully submersible in water horizontally or vertically, can be applied in glass, plastic tank, fish bowl and square tank
  • Digital & Smart: The heater is equipped with built-in thermometer, when the actual temp is above the set temp, the heater will stop heating. Otherwise, if the actual temp is below the set temp, the heater will restart to heat up the water. And the LED digital display will show the set temp and actual water temp

Application: the heater must be fixed fully submersible in water horizontally or vertically, can be applied in glass, plastic tank, fish bowl and square tank Digital & smart: the heater is equipped with built-in thermometer, when the actual temp is above the set temp, the heater will stop heating. otherwise, if the actual temp is below the set temp, the heater will restart to heat up the water. and the led digital display will show the set temp and actual water temp 100 watt aquarium heater: for 10-30 gallons fish tank, 50w aquarium heater, voltage 110v, power cord 5(ft), the temp can be set to the values ranging from 65 to 93f, please choose the right wattage aquarium heater according to our size chart Adjustable temp: to set the desired temperature ranging from 65-93by pressing the "set" button, cyclic adjustment, stabilizing the target temperature and small in temp exactness, without worries about what the temperature really is

25
7.1
SCORE
boxtech Aquarium Heater 50W, Submersible Fish Tank Thermostat Proof Explosion and Auto Digital Control, with Heat-Resistant Quartz Made for 5-15 Gallon
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boxtech Aquarium Heater 50W

Submersible Fish Tank Thermostat Proof Explosion and Auto Digital Control, with Heat-Resistant Quartz Made for 5-15 Gallon

by BOXTECH
What We like

Fully Automatic Control: Design with External Temperature Controller, Temperature Range is 68 F-90 F, when water temperature achieve the setting temperature, heater will automatically stop heating, when water temperature is lower than the setting temperature, heater will automatically start heating

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Product Features

  • Fish Tank Thermostat: 50W aquarium heaters suit for 5-15 Gallon fish tank. Voltage:110V, Power cord is 4.59ft, Max deep water immersion 20 inch/1.7 FT
  • Quartz Tube Safety Protection: Made of heat-resistant milky quartz Glass and UL-Approved Power Cord, Controller IPX4, Heater IPX8 that make it pretty shatter-proof and Explosion-proof and prevents electricity leakage, service life can be 3 years or more
  • Notice Please: Before you clean the aquarium or change water, pls must cut off the heater power, after 10 minute cooling then take out the heater and regularly clean the scale on the heater
  • Correct installation: Stick the heater vertical onto the tank side near the water intake or on the way of water flow.This way the heater can quickly sense the water temperature and make adjustments automatically, Keep the aquarium heater fully submerged in water

Notice please: before you clean the aquarium or change water, pls must cut off the heater power, after 10 minute cooling then take out the heater and regularly clean the scale on the heater Correct installation: stick the heater vertical onto the tank side near the water intake or on the way of water flow.this way the heater can quickly sense the water temperature and make adjustments automatically, keep the aquarium heater fully submerged in water Fish tank thermostat: 50w aquarium heaters suit for 5-15 gallon fish tank. voltage:110v, power cord is 4.59ft, max deep water immersion 20 inch/1.7 ft Quartz tube safety protection: made of heat-resistant milky quartz glass and ul-approved power cord, controller ipx4, heater ipx8 that make it pretty shatter-proof and explosion-proof and prevents electricity leakage, service life can be 3 years or more

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