The 8 Best Aquarium Heaters for fish Tank of 2022

it is true that fish may be the pets that require the least care, but that does not mean that they do not need any care. How much have our little fish died without knowing why? Well, many times the cause is the stress generated by the constant and abrupt change in temperature or the fact of not being at their ideal temperature. As well as any damage that a second-hand heater may have, to avoid this accident you must procure the best aquarium heater and that is what you will get shortly.

Don’t you believe me? Keep reading!

What is the best aquarium heater?

Although the market offers you, endless models of thermo heaters, the key to determining whether an aquarium heater is better than another is given by a variety of factors that you should never ignore.

And that is, after being clear about your aquarium, the species, and the type of heater that suits your budget needs, the device comes with settings that ensure the ability to control and maintain the aquarium’s temperature.

On the other hand, it is essential that you know what materials the device is made of and the other features that make it an integral and safe aquarium heater for both the fish and your user.

An example of all this, you will find it compared to the aquarium heater below, where you can also find the product that matches your search.

Here are the best aquarium heaters:

Hydor In-Line External Heater 300w

Hydor In-Line External Heater 300w

If your tank is small and there is not enough space for a heater, an external heater is ideal for those who do not like heaters for display.

This filter is an external thermal heater that is ideal for tropical and marine tanks. However, it can only be used vertically and is easy to plug and play.

It has been designed to be used in the return line from canister filters or sumps, back to the tank, and heats the water on its way back.

The technology positive thermal coefficient (PTC) is automatically synchronized to ensure overheating and blowing.

Pros :

High-quality heater.

Not visible.

He sits out of the tank.

Easy to configure.

You can maintain and check the heater without putting your hand in the tank.

Cons :

It makes a slight click as it turns on and off.

It turns on and off quite frequently.

Reports of temperature fluctuations.

Some filters will need adapter connectors.

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Fluval E Series Advanced Electronic Heater

Fluval E Series Advanced Electronic Heater

The Fluval E series heaters have an LCD temperature display that can be set to Celsius or Fahrenheit.

These are completely submerged and have an alarm that changes the color of the LED to indicate if the temperature has changed outside the preset temperature.

This heater comes with a built-in fish guard that protects your fish from any heat exposure.  and with a 5-year warranty.

pros :

Easy to see the temperature display.

Displays both Celsius and Fahrenheit.

Powers are power choices.

Permanent height once installed.

Easy access temperature switch.

Elegant design.

Secure with two electronic thermostats.


Temperatures can fluctuate up to 3 degrees.

A high flow of water is required.

Low power.

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Cobalt Aquatics Neo-Therm Heater

With a 3 year warranty, this mid-range heater performs well and appears modern and fashionable in any home aquarium.

The fully immersed heater has a slim, smooth design that fits well in a stylish home; It also has a one-touch control system.

The heater has an LED that shows both the temperature of the heater and therefore the temperature of the tank. Temperatures are often adjusted from 19 C to 35 ° C

It has a built-in heat protection circuit that shuts off the heater before overheating and it is made with an uninterrupted outer shell which makes it virtually indestructible.

Cobalt Aquatics Neo-Therm Heater

It comes in sizes ranging from 25 watts to 250 watts which calculate the volume of your tank and therefore require the necessary heating.

pros :

Completely submerged.

Design modern flats.

Regular temperature range.

Easy to configure.

3-year warranty.

The technology to turn it off before the heater overheats.

Uninterrupted outer shell.


After a while the suction cups may stop sticking; They need to be replaced.

Quite expensive.

Short shelf life report on defective products.

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Inkbird ITC-308 Digital Thermostat Socket 2 Relays 220V Probe (ITC-308 Standard Thermostat)

Inkbird ITC-308 Digital Thermostat Socket 2 Relays 220V Probe (ITC-308 Standard Thermostat)

The Inkbird ITC-308 thermostat is a digital device capable of connecting two outlets, both heating and cooling systems. Its temperature probe is made of stainless steel and allows accurate temperature measurements of plus or minus 1 degree. The display screen gives you a Celsius or Fahrenheit temperature and if the probe exceeds or exceeds the temperature limit, a buzzer will alert you. To use it, it’s very simple: thanks to the digital box, all you have to do is temperature, then the desired temperature (which you can easily adjust to 0.1 degrees centigrade) and setpoint. Thanks to the two heated indicator lights, you can quickly find out which device is working and in which mode (heating or cooling). This thermostat can be used in different sectors: fermentation, greenhouse for plants, in a terrarium, etc. With a power of 2200 watts (for heating mode) and 1100 watts (for cooling mode), it is ideal for large aquariums.

Below are some of the advantages and disadvantages of the Inkbird IT C-308 thermostat.

pros :

Dual heating and cooling socket

Security buzzer

Decrease in temperature Celsius or Fahrenheit


Hard and durable stainless steel probe

cons :

Just a little brief

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hygger aquarium heater reviews

hygger aquarium heater reviews

LED Digital Display Controller: Higher brand model. It consists of a heating element, a display screen, and a thermometer probe. You can set the temperature to 16 to 32 degrees Celsius, with an accuracy of plus or minus 1-degree centigrade, with 300 watts of power, this device is suitable for a 115 to the 220-liter aquarium. For added security, the alarm warns you if the power is interrupted or if the temperature rises too high and exceeds 36 degrees centigrade and the power goes off automatically. The heating element is made of heavy-duty quartz glass and is surrounded by a protective ield for fish.

Here are some advantages and disadvantages of Hager aquarium heaters.

pros :

Heat quickly

Security alarm

LED display

Construction standards

In the defensive case

Accurate temperature control


cons :

High price

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Marina Aquarium Heater

Marina Aquarium Heater

There is no shortage of places to buy new aquarium heaters online. If you are looking for an immersion heater, Marina offers you this model with an elongated design.

Its ease of use is one of its best assets. You will know when the process starts by looking at the indicator light up. When the latter is not activated, the product does not work.

The resistance of this reference is ensured by its solid glass structure. This design is not afraid of drowning. Thus, this variation will be long lasting.

To make your handling easier, temperature adjustment buttons have been strategically placed. You can easily access it even if the device is submerged in the tank. The heat can be adjusted to 20 to 28 degrees Celsius The power of this model is 25 watts, it will be able to condition in a container with a capacity of 20 liters.

pros :

Strong: Its resistant glass design ensures its longevity over time. The water in which this aquarium heater is submerged will not be better after many years.

Ease of use: To easily ensure that this device works properly, you can refer to the witness. It is turned on when the tool is turned on and it is turned off when the tool is off.

Power: This product can cover 25 watts 20 liters of water evenly.

Cons :

False indication of length: In its description, we refer to 15 cm or according to users, this article is 19 cm. This did not allow them to install this model on their tanks.

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HITOP Adjustable Aquarium Heater

HITOP Adjustable Aquarium Heater

Pond conditioning is essential to provide a healthy environment for fish, but it is also important to ensure the safety of the latter with the selected device. The only way to find the right material is to compare the models with each other. This will give you an idea of how to buy a better quality aquarium heater.

To reassure users, HitPo has confirmed the explosion-proof of its products. This can be done with a 2mm quartz glass design. This value is 33% higher than other samples of the same lineage. This specimen is not afraid of freshwater or sea water.

In terms of power, this device is capable of maintaining a tank temperature of 50 to 150 liters. So you’ll adjust it consistently with your needs. The same temperature that is selected is between 16 and 32 degrees Celsius.

pros :

Design Assured: The brand offers a 24-month guarantee on this product. Such a device is replaced after one year of use. This sample does not take the risk of exploding thanks to the quartz glass that composes it.

Efficient: The slot in the ceramic frame of this device distributes heat evenly throughout the pool. This is according to the parameters you choose (16 to 32 degrees Celsius).

Cons :

Doubtful accuracy: Some consumers recommend checking the water temperature which may be higher than the selected range.

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Hyder Theo Heater for Aquarium

Hyder Theo Heater for Aquarium

If you are not careful, several installations in the aquarium can quickly become cumbersome. However, the use of heat is essential and unavoidable. This is why Hyder has designed this compact model for the best condition of your pond.

Small in size, this product will not take up much space in use. It is completely submerged so you can close your tank normally. For installation, you do not need assistance. Suction cups made for the purpose of fixing it are issued by the brand.

A power of 50 W will distribute uniform heat in a 20 to the 50-liter container. With a clear and detailed user guide set in French so that you can adjust this model exactly to your liking. The temperature range lasts from 20 to 32 degrees Celsius. Then you will adapt according to your fish species.

pros :

Enough power: The 50W that this product provides is enough to heat 20 to 50 liters of the aquarium. You will be able to change the pool at any time without replacing this device.

Compact: Small in size, this device will not surround your tank. It would be prudent to target your fish and refrain from burning in contact with it. You just have to hide it behind a seaweed.

Cons :

Low accuracy: The actual temperature does not match the selected temperature. It tends to be higher. This disappoints many consumers.

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Frequently Asked Questions

Question 1: How to use an aquarium heater?

The pH, chlorine, and nitrite of the water in the aquarium must be controlled, but if you have tropical fish, the water temperature must also be adjusted and this requires the best aquarium heater. This device is also conducive to the growth of bacterial populations, which, in turn, allows the biological filtration of water to recreate the natural state of the environment.

Depending on the different designs available, you can use the heater inside or outside the water, frequently checking the temperature level or the indicator it brings, as well as to ensure a light warning about activating an error so that the temperature does not change the condition of the water.

Question 2: What heater do I need for a 100-liter aquarium?

Enough to use 100-watt power heaters in 100-liter aquariums, thus they will maintain a stable temperature without fluctuations since it is estimated that 1 watt is required to heat 1 liter of water. However, there are 75 W models that are sold in 100-liter tanks, so it is best to consult the manufacturer’s specification to know the capacity of the device.

Question 3: How to repair an aquarium heater?

On the Internet, you will find many tutorials and explanatory videos on repairing the heater resistance or changing its switch so that it works normally. However, it is important to consider that if you are not an electrician and you do not have much skill in this regard, it is better to seek technical advice from professionals or simply change the heater.

Keep in mind that the combination of electricity and water can be dangerous for you and your fish. So do your research before you start operating the heater and if it doesn’t work well, unplug it quickly, as it can create an electric shock and damage the fish.

Question 4: How to heat aquarium water without a heater?

If you do not have a special device, it is not recommended to heat the water in the aquarium directly, as you can change its pH or damage the fish without safe temperature control. However, a less dangerous and homemade technique that you can apply temporarily if you do not have a heater, is to pour hot water into a covered bottle and introduce them into the aquarium so that the water does not overflow from there. With the help of this, the water of the pond will be heated little by little for the safety of the fish. You will need a thermometer to know the temperature of the water and check if it is suitable for your fish.

Question 5: Where to put the aquarium heater?

The placement of the heater will depend on its design, as it may be external or submerged. In the first case, it can be placed after the water filter, when it is submerged you need to use the insertion and fixing system, such as suction cups stuck to the walls or floor of the aquarium, depending on the manufacturer’s instructions.

Question 6: How do you know if an aquarium heater works?

Most models currently sold in the aquarium heater category include an indicator light or an LED that shows us when it is working properly. Some include a screen that displays error messages when the temperature is too low or the device stops working. Also, the manufacturer provides instructions on how to restart the computer or fix the most common errors.

Question 7: How does an aquarium heater work?

The aquarium heater consists of a switch system and a spiral-shaped heater. The shed system is a thermostat, which is sensitive to heat and made of metal sheet.

This process bends when the thermostat reaches a certain temperature when connecting electrical circuits. The main feature of this device is that it is very sensitive and activates when it senses a change of at least 1-degree centigrade. This maintains a constant temperature inside the aquarium.

The lower part of the heater is covered with electrical resistance, usually in the form of a spiral made of chromium-nickel and a ceramic matrix.

All of these systems make the heater go inside a tube that can be made of glass, acrylic, plastic, stainless steel, or other resistant material that prevents the water from seeping into the machine or the fish from getting too close to the heater.

According to some users, if the heater is properly maintained, it can last for many years, unless improper handling is avoided, or if it fails, home repairs are attempted. The best thing is to always go to a specialized technician or pet store where they sell these devices and ask them to check their heater.

Advantages of aquarium heaters

The biggest advantage of this article is keeping water in your aquarium or fish tank at a certain temperature. Filling an aquarium with water at a certain temperature does not assure you that it will always remain the same, for many reasons it affects change. The guarantee is that in addition to having a heater, you can configure it to suit your aquatic pet needs.

Keep in mind that some fish need water at a particular temperature to survive and similarly the heater is in a position to stay the water temperature constant in order that it doesn’t create a stressful environment for the fish.

Think when selecting an aquarium heater

Choosing the right heater is very important for maintaining a healthy aquarium where life can be enriched. You can’t lose it for buying the best aquarium heater.

Types of aquarium heaters

There are four main varieties of aquarium heaters available:

Hanging tank aquarium heaters:

These are also known as suspension heaters. They hang from the back of the tank, partially submerged in water.

Submerged aquarium heaters:

These are usually tube-shaped and can be completely submerged in water. These are efficient in controlling the temperature of the water and can be placed vertically or horizontally to distribute heat even in a submerged heater. These are cheaper, worse visible.

Aquarium Heater Substrate:

Also known as low-weight heaters or heating wire systems, these are placed with sand or gravel at the bottom of the tank. They promote plant growth and are not visible. They heat more evenly.

Aquarium Heater Filter:

Combine a filter with a water heater and provide excellent heat distribution. Highly resistant, but they are not the cheapest on the market.


It is very important to choose the right power or watt for your heater so that the water in the tank is heated to the right temperature. The larger your aquarium, the more power your heater will need. This is why you should calculate the size of your aquarium in gallons and the average temperature of the room in which it is located.


In this sense, every manufacturer and brand that makes aquarium heaters indicates that the size of each aquarium will be the best for each model.

Types of aquariums

This is important before you decide on a suitable heater, but you can be sure that you will find heaters for saltwater aquariums, freshwater aquariums, turtle tanks, betta tanks, and reef tanks. It is also possible to find models that work for different types of aquariums.

Ease of maintenance

For your comfort, it should be easy to clean. Replacing broken or worn parts is worse.

Access to controls.

A large control knob that is easy to grip and turn is key when it comes to comfort when adjusting your heater.

Adjustable temperature

Some heaters come with a set temperature, changing it doesn’t have to be mission impossible. They should have adjustable temperature gauges.

Temperature readability

The best ones have easily visible numerical temperature gauges. But this number may not always be exact, so having a thermometer is fine.


As we are looking for an electrical device, it is very important to take into account what type of connection it incorporates and needs, even when it is an inexpensive heater, as some may include American or English-type plugs, which would generate an additional expense to buy an adapter.

Likewise, many manufacturers emphasize the extension of the power cord, to provide greater comfort in the installation of the heater, so it is most recommended that it be greater than 1.5 meters and not be a limitation when plugging it in.

In short, buying an aquarium heater should not represent a concern if you are clear about what you need for your fish, in addition to the appearance you would like it to have and the price you are willing to pay. Therefore, evaluate all these aspects when making your purchase and, surely, you will succeed with functional equipment and with a very positive value for money.


Finding the best aquarium heater is important for both the welfare of the fish and the safety of them and humans. Outdoor pool heaters have many advantages, but they consume a lot of energy and therefore cost money. Therefore, it is rarely installed nowadays.

Stand thermofilters in particular are positive in aquarium heater tests, as they provide adequate heat energy production and distribution, are safe, and can be adjusted without problems when needed.

The combination of the heating rod and the floor was light also achieves good results, as both together can heat most pools well enough and floor heating helps the plant to grow them.

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