10 Best Small Fish Tank Heater

Updated on: June 2021

Best Small Fish Tank Heater in 2021


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

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
BESTSELLER NO. 1 in 2021

Aqueon Mini Heater for Aquariums, 5W, Under 2.5 Gallon

Aqueon Mini Heater for Aquariums, 5W, Under 2.5 Gallon
BESTSELLER NO. 2 in 2021
  • Ideal for small glass or acrylic desktop aquariums up to 2. 5 Gallons
  • Fully submersible
  • Quick and easy installation, vertical or horizontal placement using Suction cups
  • Shatterproof construction
  • Note: Do not operate or leave product plugged in when it is outside of water

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

Hygger Mini Glass Aquarium Heater Adjustable LED Digital Temperature Display Small Tank Heater for Turtle Betta Fish Bowl with Protective Guard 50W
BESTSELLER NO. 3 in 2021
  • 【Run Dry Protection】This 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 Guard】Made 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 Display】External temperature setting control avoids getting hands wet, digital LED display shows real time water temperature. Heating temperature range from 63 to 94°F. Control accuracy is +/- 1°F.
  • 【Automated Shut Off System】Once 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
  • 【For Fish Tank 1-6.5 Gallon】50 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

Aqueon 100101230 Flat Submersible Heater, Black,7.5W, up to 3 gallon

Aqueon 100101230 Flat Submersible Heater, Black,7.5W, up to 3 gallon
BESTSELLER NO. 4 in 2021
  • Ideal for small glass or acrylic desktop aquariums 2. 5 to 5 gallons
  • Fully submersible
  • Quick and easy installation, vertical or horizontal placement using Suction cups
  • Shatterproof construction
  • Note: Do not operate or leave product plugged in when it is outside of water

Tetra HT Submersible Aquarium Heater With Electronic Thermostat, 50-Watt

Tetra HT Submersible Aquarium Heater With Electronic Thermostat, 50-Watt
BESTSELLER NO. 5 in 2021
  • All Tetra HT heaters have indicator lights to let you know when the heater is on. It will be red when heating and green when the proper temperature has been reached.
  • The HT10 uses a built in electronic theromstat to automatically maintain water at 78° F which is ideal for most tropical fish. No adjustment is requried.
  • Ideal for aquariums between 2 to 10 gallons with hoods or glass canopies
  • The HT heater is fully submersbile and can be installed vertically or horizontally. It's small footprint makes it easy to conceal behind plants or other décor.
  • Please read all label information upon delivery. DO NOT plug heater into an electrical outlet until it is placed inside the aquarium.

Marina Betta Submersible Heater for Aquarium

Marina Betta Submersible Heater for Aquarium
BESTSELLER NO. 6 in 2021
  • Submersible heater for aquariums upto 1.5 gallons
  • Creates ideal conditions for bettas to live in
  • Made of durable polymer, tougher than glass
  • Automatically reaches set temperature
  • Eight watts

VIBIRIT Aquarium Heater,Betta Fish Tank Heater 25W Smart Small Aquarium Heater,Energy Efficient Submersible Thermostat + Thermometer Sticker

VIBIRIT Aquarium Heater,Betta Fish Tank Heater 25W Smart Small Aquarium Heater,Energy Efficient Submersible Thermostat + Thermometer Sticker
BESTSELLER NO. 7 in 2021
  • Fully Automatic Temperature Control Chip:VIBIRIT submersible aquarium heater automatically adjusts the temperature between 75°F and 82°F (24°C to 28°C). It is different from the traditional manual adjustment of the aquarium heater and does not need to be set. And will automatically turn on/off to achieve the setting temperature constantly and stably, Energy-efficient.
  • Advanced Materials: sturdy engineering plastic. It has 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.
  • 25W Fish Tank Heater is suitable for 3 to 5 gallons and can be used in mini fish tanks and aquariums. The super-designed suction cups hold the heater tightly in the aquarium. Easy to hide in the water tank.
  • Included Temperature Sticker: You can attach the temperature sticker to the surface of the water tank, through which you can monitor. The easy-to-recognize blue color indicates the current temperature of your aquarium water. Temperature bar is for reference only
  • Parameters and Quality Assurance: working power 25w, frequency: 50/60Hz, voltage: 110-120V, waterproof rating IP68. This product aquarium heater has passed CE, ROHS, FCC certification. Explosion-proof, waterproof, anti-scalding, high temperature and other safe operation.

FREESEA 25 Watt Aquarium Betta Fish Tank Heater with Aquarium Submersible Thermometer

FREESEA 25 Watt Aquarium Betta Fish Tank Heater with Aquarium Submersible Thermometer
BESTSELLER NO. 8 in 2021
  • ★【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.

Mylivell Aquarium Heater Submersible Auto Thermostat Heater,Fish Tank Water Heater and Adjustable Temperature with Suction Cup-200W

Mylivell Aquarium Heater Submersible Auto Thermostat Heater,Fish Tank Water Heater and Adjustable Temperature with Suction Cup-200W
BESTSELLER NO. 9 in 2021
  • High Quality: Aquarium heater made of high quality quartz glass, double seal material , advanced design, ensures safe operation.
  • Adjustable Temperature: The temperature of the fish tank heater can be adjusted automatically. Temperature setting range: 20°~34°C(65° F - 93° F), and the display is easy to read.
  • Fully Submersible. Power: 100W. Suggested water volume: 75gal.
  • Both suiting for fresh or saltwater aquariums, provide a constant warm environment for your tropical fish to stay healthy.
  • Convenient and Safe: Our aquarium heater thermostat has two suction cups for attachment to the fish tank. The polarized plug prevents electrical shock.

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

FREESEA 50W Mini Aquarium Fish Tank Submersible Heater with LED Temperature Display
BESTSELLER NO. 10 in 2021
  • ★ 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.

Tall or Wide? Comparing Aquarium Shapes

Choosing which aquarium to purchase is the first step in bringing home new pet fish. Pet stores and aquarium specialty shops have a wide selection of glass and acrylic fish tanks.

Wide Aquarium Shapes - The Pros

Wide aquarium shapes are those whose bases are larger than the aquarium is tall. This is the classic shape of most fish tanks: a long, low rectangle best suited for display against a wall. Most fish tank stands are built for these types of aquariums.

Besides being easy to find, these wide aquariums also provide more swimming area for many types of fish. They can be decorated in such a way as to provide more territories for the animals that live within.

Wide aquariums also create a greater surface area where the gasses can mix in and out of the water. This in important for releasing carbon dioxide from the water and soaking in oxygen.

Wide Aquarium Shapes - The Cons

The main negative about wide aquariums is the space they take up in your home. This style of fish tank looks best against a wall. In smaller homes, these areas are usually taken up by couches, beds, and tables.

Tall Aquarium Shapes - The Pros

Tall aquariums have a smaller base size, allowing them to fit more neatly into your home decor. There are even corner models. These aquariums can provide swimming space for many different types of fish who enjoy different levels of the fish tank.

Tall Aquarium Shapes - The Cons

While many different fish do swim at varying water levels, a tall aquarium cannot support as many fish as a long or wide one. The surface area is smaller, which means that less gas is exchanged. Also, if the tank is very tall, you are less likely to be able to find fish that will fill in all the levels. These tanks are best for specimen fish with a high body shape, such as angel fish or discus.

Choosing between wide and tall shaped aquariums is mostly a matter of personal taste, space available, and the type and number of fish you want to keep. No matter what type you decide to buy, you can still have a healthy and beautiful aquarium full of fish at home.

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