The temperature of water significantly affects the health of a fish and other inhabitants of an aquarium. Ideally, an aquarium should not be too cold. Under such circumstances, a fish will find it hard to thrive. in this article we are going to discuss, best aquarium heater. for your fish tank. If the temperature of the aquarium is not well regulated, you may lose a few of your pets. This issue has increased the need for an aquarium heater. It is an essential item if you must keep warm water fish in an aquarium.

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  • Tetra HT Submersible Aquarium Heater​
  • AquaTop Quartz Glass Submersible Heaters
  • Eheim Jager Aquarium Thermostat Heater
  • Cobalt Aquarium Heate
  • Fluval E Electronic Heater
  • Mylivell Aquarium Heater
  • Aqueon Preset Heater
  • FREESEA Aquarium Submersible Heater
  • Orlushy Submersible Aquarium Heater
  • SZELAM 25W Smart Mini Aquarium Heater


Tetra HT Submersible Aquarium Heater

Price$ $ 
Dimension5.2 x 1.6 x 3.5 inches
Weight6.4 ounces
Heat Output50 Watt
Capacity2-55 Gallons
Power Source110V AC

AquaTop Quartz Glass Submersible Heaters

Price$ $ 
Dimension9 x 1.5 x 1.5 inches
Weight9.6 ounces
Heat Output50 Watt
Capacity13 Gallons
Power Source110V AC

Eheim Jager Aquarium Thermostat Heater

Price$ $ 
Dimension1.4 x 19.9 inches
Weight13.1 ounces
Heat Output300 Watt
Capacity170 Gallons
Power Source110V AC

Cobalt Aquarium Heater

Price$ $ 
Dimension3.2 x 2.2 x 7.8 inches
Weight10.9 ounces
Heat Output25 Watt
Capacity6 Gallons
Power Source110V AC

Fluval E Electronic Heater

Price$ $ 
Dimension2 x 1 x 14 inches
Weight1.05 pounds
Heat Output300 Watt
Capacity100 Gallons
Power Source110V AC

Mylivell Aquarium Heater

Price$ $ 
Dimension2 x 1 x 14 inches
Weight7.4 ounces
Heat Output100 Watt
Capacity20 Gallons
Power Source110V AC

Aqueon Preset Heater

Price$ $ 
Dimension3.5 x 1.5 x 7 inches
Weight7.2 ounces
Heat Output50 Watt
Capacity20 Gallons
Power Source110V AC

FREESEA Aquarium Submersible Heater

Price$ $ 
Dimension2.5 x 1.5 x3.5 inch
Weight7.2 ounces
Heat Output50 Watt
Capacity1-10 Gallons
Power Source110V AC

Orlushy Submersible Aquarium Heater

Price$ $ 
DimensionLength – 9″
Weight12.6 ounces
Heat Output100 Watt
Capacity10-15 Gallons
Power Source110V AC

SZELAM 25W Smart Mini Aquarium Heater

Price$ $ 
Dimension5.3in x 1in x 0.7in
Weight5.3oz / 150g
Heat Output25 Watt
Capacity5 Gallons
Power Source110V AC


Identifying the need for an aquarium heater is different from determining what type of aquarium heater is needed. There are freshwater and saltwater aquariums. Your choice of the heater depends on how the tank is configured or designed. The size if the aquarium also has a role to play in the decision-making process. This fact is because each heater has an output power based on the volume of water in the tank. Hence, a 100W aquarium heater may not work well in an 80-gallon aquarium. Getting apart from the composition of the pond,  you have to consider the budget and several other factors before making a choice. To ease your pain and lessen your burden, we have created this guide. It will not only help you choose an aquarium heater, but it will also help you select the right aquarium heater.

1. Tetra HT Submersible Aquarium Heater

The heating element of this aquarium heater has a glass design. It has an electronic thermostat and a great look. You can use them easily different sizes of aquarium up to 55 gallons. Also, its thermostat is capable of regulating the temperature of water to 78°F. This product features an indicator light that lets you know when the unit is in operation. Green indicates that the heater is on standby, and red means it is in process. It also has an auto shut-off mechanism that offers an added level of protection whenever the temperature is very high. The weight of this aquarium heater is 8 ounces, and it measures 5.2 x 1.6 x 3.5 inches in size. Make sure this heater is ON only when it is in the aquarium. Installation of this heater is very flexible; whether vertical or horizontal, it works well.

2. AquaTop Quartz Glass Submersible Heaters

This aquarium heater can deliver heat output between 50W and 300W. Also, it is capable of raising the temperature of an aquarium to 93°F. It is fully submersible, and it measures 9 x 1.5 x 1.5 inches in size. It has a 13-gallon tank. The weight of this heater is 9.6 ounces. Temperature control is effortless to do, and it plugs into a 120V outlet. This unit can get mounted both horizontally or vertically, depending on your preference. It features suction cups and a conspicuous temperature display. It has a temperature adjustment knob that is very easy to tweak. The heater made from high-quality glass, this heater has dual insulation, which gives credence to its safety. You can rely on active customer support from the sellers and manufacturers of this aquarium heater. This product is capable of raising the temperature of an aquarium, yet it helps you save many household bills.

3. Eheim Jager Aquarium Thermostat Heater

It contains indicator lights that let you know the mode of operation of the unit. It has glass construction and a temperature dial through which you can choose the temperature setting between 65°F and 93°F. Mounting brackets, power cords, and suction cups included in the package. This unit has to overheat protective mechanism and other safety controls. It can get recalibrated due to the presence of a readjustment ring. For both freshwater or saltwater aquarium, this heater works well. It made for aquariums measuring 159 gallons to 264 gallons. The EheimJager Aquarium Thermostat Heater is rugged and can withstand temperature fluctuations. A good thing about this product is, it does not pollute the water where it gets placed. Running-dry protection means the heater will automatically shut-off if it is not inside the water. This aquarium heater weights 13.1 ounces. It can deliver an output of 300W.

4. Cobalt Aquarium Heate

This water heater has an adjustable thermostat. It can deliver output between 25W and 300W. It has an LED display that lets you know the operating temperature and that of the tank. Furthermore, the operating temperature of this heater can get set between 66 degrees Fahrenheit and 93 degrees Fahrenheit. There is also an automatic shut-off mechanism in place in case of overheat. This product is usable for both freshwater and saltwater aquariums. It has a flat design, and it is fully submersible.  A 3-year warranty backs this unit. The weight of this aquarium heater is 10.9 ounces, and it measures 3.2 x 2.2 x 7.8 inches in size. If there is a power failure, the previous setting of this heater is maintained.

5. Fluval E Electronic Heater

This heater guarantees the safety of your aquarium inhabitants. It makes use of advanced technology in delivering superior heat to your aquarium. It features an LCD that allows you to know the temperature of water at every point in time. This heater contains temperature adjustment lever can be set in steps of 0.5 degrees. The Fluval E Electronic heater boasts of an integrated fish guard so that no fish will come close to the heater core. A mounting bracket usually included in the package.

It is possible to remove the heater without altering the position of the bracket. Also, this product can get mounted in different angles and positions. There are various sizes of this product. The 50W Fluval E Electronic heater is ideal for aquariums up to 15 gallons. 100W unit works for aquariums up to 30 gallons. 200W for aquariums up to 65 gallons and 300W for aquariums up to 100 gallons.

6. Mylivell Aquarium Heater

Asides featuring an automatic thermostat, this heater has a protective case, two suction cups, and temperature can be adjusted quickly. It is submersible, and you can select an ideal temperature from 68 degrees Fahrenheit to 93 degrees Fahrenheit. It is perfect for a 75 liters to 170 liters fish tank. The electrical requirement for this product is 110V/50Hz. The weight of this unit is 7.4 ounces while it measures 11.2 x 2.9 x 1.6 inches in size. A polarized plug is included to guide against electrical shock. Not an issue at all whether it is a freshwater or saltwater aquarium, the Mylivell Aquarium Heater will do the job. It made from quartz glass. It has an advanced design, and it is well insulated. The temperature display of this heater is very conspicuous and easy to read. The output power of this product is 100W. Hence, steady heat is guaranteed.

7. Aqueon Preset Heater

This aquarium heater has a power indicator light that lets you know the mode of operation of the unit. A 1-year warranty backs it, but it does not have an adjustable heat setting. This unit made for aquariums up to 20 gallons. It delivers an output of 50W. We feel glad to inform that it made from quality quartz glass gives credence to how strong and sturdy it is. This heater measures 3.5 x 1.5 x 7 inches in size. It weighs 7.2 ounces. Therefore, it is incredibly lightweight. The Aqueon Preset Heater comes with a suction pump. Do not switch on this heater outside the aquarium. If it is not get placed in water, it will overheat, and the safety fuse will develop a fault.

Another thing to note is that this product is fully submersible. This product may require up to 24 hours to raise the temperature of an aquarium. Hence, it is not fast-warming.

8. FREESEA Aquarium Submersible Heater

The heat output of this heater ranges from 50W to 300W. It has an LED temperature display, and it is fully submersible. The Freesea Aquarium Fish Tank Heater has a size of 2.5 x 1.5 x 3.5 inches. The electrical specification for this product is 120V, 60Hz. Its LED display makes use of advanced IC technology in reading out the temperature of the heater and aquarium. It features a built-in temperature control chip, an external touch button, and a waterproof design. Also, there is an overheat protective mechanism in place. This feature secures the heater and your aquarium inhabitant. You can rely on 24-hour professional customer support after the purchase of this item. A 1-year warranty backs this product. It weighs 10.6 ounces, and it measures 2.5 x 1.5 x 3.5 inches in size. For safety purposes, make sure this heater is not ON in when cleaning the aquarium.

9. Orlushy Submersible Aquarium Heater

This product is suitable for saltwater and freshwater. It has a temperature adjustment knob and two suction cups. Also, a free thermometer included in the package. Availability of this product is in different sizes and capacity. It is not only fully submersible, but it also has an overheat protective mechanism. This unit plugs into a 120V, 60Hz outlet. It made from quartz glass. Hence, it is shatter-resistant. There is a power indicator light that gives you an insight into the operating mode of the unit.

Furthermore, installation is easy, and the heater can get mounted across different angles. It weighs 1.6 pounds. Also, this product measures 10.6 x 3.6 x 2.3 inches in size. The 100W heater is suitable for an aquarium up to 30 gallons. The 300W heater is ideal for an aquarium up to 80 gallons. This heater can stay hidden in the tank, and it doesn’t pose any risks to the inhabitants of the aquarium.

10. SZELAM 25W Smart Mini Aquarium Heater

This device is an energy-efficient water heater. It is fully submersible and works for all types of the fish tank. To prolong the lifespan of the radiator, ensure you clean the appliance regularly. It weighs 6.4 ounces. Hence, it is lightweight. The size of this aquarium heater is 6.3 x 3.2 x 1.8 inches. A 1-year warranty backs it. ROHS, FCC, and CE certify the product. For both saltwater and freshwater, it works well. It features resistant ABS housing, anti-explosion, and ceramic heating system. It is moderately-sized, and there is no risk of shocks or burns. Please do not turn on the unit when it is outside water. It is designed to operate inside water. A significant advantage of this heater is that it is self-regulating. On the other hand, temperature settings cannot get adjusted. It is set to remain the way it is.

Frequently Asked Question

A tropical fish will find it hard to thrive in cold water. Therefore, tropical fish needs a temperature of about78°F to stay in good health. That said, temperature fluctuations must also be avoided to protect the lives of the inhabitants of the aquarium. Also, it’s our duty to ensure the best circumstance around the inhabitance for their health concern.

The installation of an aquarium heater must get done strategically. Submersible aquarium heaters offer a bit of flexibility in the sense that they can get mounted across different angles. However, for enhanced heat distribution, the radiator should be mounted close to a filter inlet or outlet. Also, you may decide to keep the heater hidden sometimes. Although, this device plays the role of a decorator inside aquarium sometimes.

For heating a pond entirely, the heater must be very powerful. In theory,3-5 watts is needed to raise the temperature of 1 gallon of water substantially. That means an aquarium measuring 80 gallons in capacity will need a 300 to 400 watts heater.

Usually, all good aquarium heaters are self-regulating. In other words, they stop working when the desired temperature get attained. Conversely, they resume operation when the temperature of the pond is getting too cold. Therefore, some device contains a safety feature to automatically get turned OFF in some situation.

There is no harm in putting an aquarium heater in a plastic fish tank. The reason for this is because of the ability of water to distribute thermal energy effectively. Apart from that, water has insulating properties that make it impossible for the plastic to melt. Hence, it should keep apart from any metal body to ensure safety concern. Therefore, it is said that nothing is important than safety while talking about an electrical appearance.

There are many types and brands of aquarium heaters. Everybody has their unique qualities. Also, all the manufacturers demand they are the best. Whether you choose or buy an aquarium heater you need the consideration of several matrices described here.

All manufacturers of this product lay claim to having the best aquarium heaters. A right aquarium heater must have all the features listed in the next section of this article. Also, there are ten products reviewed in this text, and they are all handy devices.

There are many types and brands of aquarium heaters. Everybody has their unique qualities. Also, all the manufacturers demand they are the best. Whether you choose or buy an aquarium heater you need the consideration of several matrices described here.

All manufacturers of this product lay claim to having the best aquarium heaters. A right aquarium heater must have all the features listed in the next section of this article. Also, there are ten products reviewed in this text, and they are all handy devices.

Aquarium heaters are readily available. Whether online or in shopping malls, they can be purchased. You can buy from an online outlet and have it delivered to you in a matter of days.

The price of an aquarium heater is not get carved in stone. There are several determinants such as heating capacity, output power, design of the unit, and size.

Buying Guides Of Best Aquarium Heater


Although the choice of an aquarium heater depends on personal preference, there are a few other critical things to consider. That said, what a person regards as a right aquarium heater may not be good enough for another person. These are some of the things to note before paying for an aquarium heater. how to prevent aquarium heater disaster.


Before buying any product, you must first understand that there is an inverse relationship between the rate of heat loss and the size of the water body. If the aquarium is huge, the heat will not be lost quickly. We have already established the fact that 3 watts to 5 watts output are what is needed to raise the temperature of 1-gallon of water. Knowing the exact wattage needed requires a little bit of calculation. You have to subtract the temperature of the room or space from the temperature you desire for the pond. If you want your aquarium to operate at 73 degrees Fahrenheit and the room temperature is 60 degrees Fahrenheit, 13 degrees Fahrenheit must heat your tank. If you are still oblivious of the size of the heater, some product manufacturers usually indicate the size of the container for which the unit made for performance.


As stated by ab initio, the size of aquarium heaters vary. It varies due to differences in makers, models, power output, design, and heating capacity. That said, your budget will influence your thinking and your choice. If you choose a famous brand, it may help you strike a balance between price and quality.


Design isn’t only about how beautiful or attractive the heater is. There is more to design than physical appearance. That is not to say the presence of an aquarium heater doesn’t matter. It does. You would never want to spend your hard-earned money on something, not looking nice or befitting. What we are trying to say is that there is more to design than just color, and style. The design of an aquarium heater also affects how it operates and how it gets installed. Look out for a radiant heater but make sure the materials from which it gets made are not harmful to the inhabitants of your aquarium. What we are simply saying is that there must be a balance between style and safety. The design also affects the weight and compactness of the unit. A lightweight and space-saving heater is what you should reach to buy.


The safety of your pets should be on your mind before you pick any aquarium heater. You wouldn’t want to expose them to unnecessary risks or watch them die. There are too many aquarium heaters in the market, and we have dangerous ones among them. The create exposure for burns and electric shocks. Make sure CE, FCC, or ROHS certify any brand you are buying. An unsafe aquarium heater will not only pose a risk to the inhabitants of the aquarium but also the operator of the device. Scrutinize every product before you pay.

Ease of installation:

A right aquarium heater is not difficult to put together. It usually requires little or no electrical and plumbing knowledge. All manufacturers know that making an aquarium heater is challenging to install. Therefore, this should be one of the first qualities to look out for buying it. The harder it is to install, the higher the cost of installation will be if you have decided to outsource this task.

Heat output and efficiency:

The reason for buying an aquarium heater is for the temperature of the aquarium to be steady and meaningful. If an aquarium heater cannot deliver this, it means it has failed in its primary responsibility. It should be able to produce heat enough to warm the body of water in which it gets placed. Also, an aquarium heater must be highly efficient. This matter means power and heat loss should be minimal. The efficiency of the product is a reflection of how to input energy get converted into useful heat. If the heater requires so much input to bring about 1-degree temperature rise, its efficiency is questionable.

Other features:

This includes the type of material used in making the product, how sturdy the unit is, and a few other things. While some aquarium heaters have an LED display for the reading of temperature, others do not. The temperature adjustment setting of the device is also essential. This matter dramatically influences the ease of using such a method. Also, some products come with a thermometer and thermostat while others do not.


An aquarium heater cannot get considered good enough if it does not deliver the goods. Providing the products does not only imply a top-notch performance, but it also means that it must have all the qualities enlisted in this article. There is also a place for personal preference. So, if you are not cool with any of the products we have reviewed in this article, you can choose an entirely different brand. However, you must make sure it is not capable of causing damage to your aquarium and its inhabitants. There are different types of aquarium heaters. For example, a preset heater remains the way it is. That means the value of the heat it supplies cannot be varied. Also, some aquarium heaters do not necessarily sit in your tank; it all depends on what you want.This article is a deliberate attempt to answer some of the questions most people ask about aquarium heaters. It is also a deliberate attempt to correct some wrong and unfounded impressions people have about this device. We started by letting you know what an aquarium heater does. Then proceeded to review some of the most prestigious and best-selling products in the market. We did not forget to let you know the qualities an aquarium heater should have and hope that you find this piece useful and exciting.