Best betta heater a comprehensive buying guide for aquaristsThe best betta heater is needed by any aquarists to keep your betta fish tank at the right temperature as it is very important for their health. These heaters are able to evenly heat up your tank’s water and stabilize the temperature at whatever you set it to. Along with this feature, many fish tank heater for Betta also come with useful functionalities such as safety switches and LED displays to make your task easier.

Finding the best small tank heater can be quite a hassle; so, to help you out with this, we have comprehensively tested and reviewed many of the best heaters for betta fish and curated a list for you!

Comparison Chart

Name Dimensions (in inches) Power (in watts)
Fluval E100 Advanced Electronic Heater

‎1.8 x 3.3 x 15.3 100
Eheim Jager Aquarium Thermostat Heater

20 X 1.4 Diameter (Cylindrical) 300
Fluval M50 Submersible Heater

1.8 x 4.8 x 14.8 50
Fluval Marina Submersible Heater

5 x 5 x 1.3 25
Hygger Mini Glass Aquarium Heater

7.6 x 4.7 x 2.5 50

The Best Betta Heaters: Handpicked Reviews

Let’s get straight into our list of the best betta heaters:

1. Fluval E100 Advanced Electronic Heater

– Pros

  • Dual temperature sensors
  • Integrated fish guard
  • LCD
  • Fully submersible

– Cons

  • Slightly expensive

The Fluval E100 Advanced Electronic Heater is a superb all-around device that gives you everything you’ll need from a tank heater for Betta. This device is designed with various features such as dual temperature sensors, an LCD, a toggle lever, and many more that will make keeping your betta fish warm hassle-free.

The dual temperature sensors are highly efficient and provide accurate temperature results all the time. So, you can be sure that the temperature being displayed is correct. Also, reading the temperature is very easy as it is updated in real-time on the built-in LCD. This display is conveniently located at the front of the heater, so you can easily stay updated on your betta tank’s temperature.

Along with accurately displaying the temperature, the Fluval E100 Advanced Electronic Heater also has a simplified temperature control lever. Placed at the top of the device, you can easily shift the toggle lever left or right to control the temperature in One degree Fahrenheit increments. Also, to make sure you are shifting it in the right direction, an integrated color display will light up red for an increase in temperature and vice versa.

Moreover, this aquarium heater is easy to install and use even with all these features. The credit goes to its smart mounting bracket, which can easily be separated from the device. It makes installation and maintenance much easier as you don’t have to attach and detach the device to your tank each time.

Even with all these features, a common concern you might have is that your aquarium heater can injure or burn your fish. It is not the case with the Fluval E100 Advanced Electronic Heater, as it is designed with a safety shut-off and fish guard to keep your tank and pets safe. These systems work together to keep fish away from direct heat and will also turn off the heater in case of any issues.

That being said, while this device is excellent for betta tanks and is jam-packed with features, it might not be the best option if you are on a tight budget. It is because the features do come at a price making this one of the most expensive options on this list.

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– Overview

If you are looking for a feature-packed device for your betta tank, the Fluval E100 Advanced Electronic Heater is a device you can look into. This aquarium heater comes with multiple features ranging from dual temperature sensors and an easy temperature control lever to a fish guard and more.

However, while it does make aquarium heating quite easy, this device is also quite expensive and may not be the best if you are on a tight budget.

2. Eheim Jager Aquarium Thermostat Heater

– Pros

  • Shock and shatter-resistant
  • Powerful heating capacity
  • Fully submersible
  • Suitable for larger tanks

– Cons

  • Quite large

The Eheim Hager Aquarium Thermostat is a heavy-duty device suitable for larger tank setups. This device boasts an impressive heating power of 300 watts, easily keeping tanks up to 260 gallons in capacity warm.

A common concern is that any cracks or shocks can lead to quite some damage to your tank or aquatic environment with all this power. Thankfully, this is not the case with the Eheim Hager Aquarium Thermostat, as it is built with shatter and shock-resistant glass, which is highly durable and resistant.

Along with adding to safety, this glass is also corrosion-resistant making this device perfect for both fresh and marine water environments.

Adding to the safety features of this powerful tank heater, it also comes with integrated thermo-safety control. It protects against the heater running in dry conditions and automatically turns it off if the water is too low. So, even if the heater falls out or there are any leaks in your tank, it will turn itself off until you fix the problem.

While this aquarium heater is great for larger tanks due to its high-powered heating capacity, this does also make it a bit too powerful for smaller tanks. Specifically, due to its large size, this might not be easy to use if you have a small or medium-sized betta tank.

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– Overview

If you have a large betta tank and are looking for a heater that can keep it warm, the Eheim Jager Aquarium Thermostat is an option that can get the job done. It has a powerful 300-watt heating capacity as well as many safety features such as thermo-safety control and shock-resistant glass, making it suitable for all kinds of tanks.

Although, its high capacity does lead to a larger device, and it might not be ideal if you have a smaller betta tank

3. Fluval M50 Submersible Heater

– Pros

  • Reasonably priced
  • Compact design
  • Unique reflective design
  • On/Off indicator light

– Cons

  • Lacks temperature display

For those of you looking for a betta tank filter on a budget, the Fluval M50 Submersible Heater is an option you can consider. It comes with powerful 50-watt heating as well as multiple features such as a ceramic heat sink and indicator lights at a reasonable price point. So, you can keep your betta fish warm without having to break the bank.

Along with being cost-effective, Fluval has used an eye-catching reflective technology to make this aquarium heater blend in with your tank setup. As it is shaped like a long cylinder, the technology works by mirroring surrounding colors in the tube’s glass so that it can match your tank’s colors. This design, combined with the heater’s compact and sleek shape, makes it a great option for most aquariums.

An added benefit is that the entire tube is made from shock-resistant Borosilicate glass which is very sturdy and can easily resist impacts. Thanks to this, you don’t have to worry about cracking or breaking this device when installing or moving it around.

When it comes to heating, this device is efficient and comes integrated with high-quality features to keep your betta tank warm when it comes to heating. For example, it has a high-density ceramic heat sink that allows for even temperature distribution, as well as a 20 ring sealing system that provides an air-tight seal for the heater.

Also, this device comes with a conveniently placed temperature control dial which makes controlling the heating power very easy. Just turn the dial according to your tank’s requirements, and the computer calibrated thermostat will heat your tank in no time. Moreover, there is also an integrated blue light that turns on when the device is heating, so you always know whether it is working or not.

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– Overview

The Fluval M50 Submersible Heater is an excellent option for those of you on a tight budget. It is reasonably priced and still manages to offer various useful features like indicator lights and a 20 ring sealing system along with an impressive 50-watt heating capacity. Also, Fluval has used high-quality materials across the device, so you won’t have to worry about any accidental cracks or leaks.

4. Fluval Marina Submersible Heater

– Pros

  • Easy installation
  • Built-in bumper guard to protect fish
  • Impact-resistant glass
  • Easily accessible temperature dial

– Cons

  • Not very powerful

If you are a beginner looking for your first betta tank heater, the Fluval Marina Submersible Heater is one option you can consider. With clearly visible temperature controls and an easily accessible temperature control dial, it is quite simple to understand.

Along with being easy to use, this betta heater is also quite sturdy and secure. With impact-resistant glass around its body, it can easily handle small drops and hits without any risk of cracking. Also, this device comes with an integrated bumper guard that keeps your fish protected from getting burned or scalded. So, you can focus on the temperature of your tank and keep your fish happy with this heater.

An added benefit of the Fluval Marina Submersible Heater is that installation is quick and simple. It comes with a bracket that attaches easily to your aquarium wall with built-in suction cups. This bracket allows for easy removal and also provides a secure hold making it great for all kinds of aquariums. Fluval has also added a 5.9-feet long power cable that can easily reach nearby power outlets.

While it is a great device for beginners, this aquarium heater does lack in terms of power. With only 25 watts of heating power, it is more suited for smaller aquariums and is a perfect heater for 3.5 gallon betta tank. On the other hand, you might need more than one of these if you have a larger aquarium.

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– Overview

The Fluval Marina Submersible Heater is an easy-to-use device that is great for beginner aquarists. Everything from installation to temperature control is simple and does not require much effort. Also, with a durable impact-resistant body, this device can easily withstand small drops making it perfect if you are clumsy! However, as it only offers 25 watts of power, you should avoid using it in large tanks.

5. Hygger Mini Glass Aquarium Heater

– Pros

  • Conveniently priced
  • A protective guard for fish
  • LED display
  • Run dry protection

– Cons

  • Might not blend in with all tanks

The Hygger Mini Glass Aquarium Heater is a high-quality device that offers great heating and safety for your tank and pets. It is packed with multiple safety features such as a quartz glass build, serrated guard, run-dry protection, and many others that make it much more secure for use in crowded betta tanks.

The protective guard on the device is made out of high-quality quartz glass and keeps both the device and your fish safe. This is because the shatter-resistant glass keeps the body of the heater safe while also acting as a protective cover that keeps your fish away from direct heat. Thanks to this, you won’t have to worry about your betta fish accidentally touching the filter and scalding or punching.

An added benefit of the protective guard is that it surrounds the device with a waterproof double seal. This seal covers the internal nickel wiring, which helps it stay dry and avoid any chances of corrosion. So, you can make use of efficient heating without worrying about any chances of leaks or cracks.

Apart from this, the Hygger Mini Glass Aquarium Heater also comes with an automated shut-off system. This works by turning the device off whenever it reaches the set temperature, as well as in case the water level is too low. It is great for keeping your pets safe, as dry heating can lead to various issues, especially in low water tanks.

With all these guards and features, you might think that controlling the temperature would be difficult, but this is not the case. Hygger has added an LED display as well as external temperature controls for managing your tank’s water temperature. With this, all you have to do is press the button outside the tank, and the display will let you know what the temperature has been set to.

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– Overview

If you are looking for a device that can keep your fish tank warm while keeping your fish safe, the Hygger Mini Glass Aquarium Heater is a good option. It is loaded with safety features such as a serrated protective guard, auto shut-off functionality, and much more that will keep your tank and fish safe. Also, with external temperature control and a digital display, using this heater is quite simple and fun.

Buying Guide

Here’s a list of some things you should consider when looking for a betta heater:

– Safety

One of the most important things to keep in mind when buying a betta tank heater is safety. This is because if your heater has exposed parts or lacks proper protection, it can easily burn your fish and plants. These burns can be quite severe and also sometimes fatal for your fish.

So, to avoid such mishaps, make sure you look for an aquarium heater that comes with safety features and parts. For example, many options on the market nowadays come with protective guards that cover the hot areas as well as enclosed designs that make it harder for fish to get close. This will make sure your fish don’t get burned and enjoy the heater’s warmth happily.

– Power

No matter how many additional features a water heater for Betta fish may have, its actual capability for heating comes down to the power it has. This is usually measured in Watts, and aquarium heaters are available in varying levels of power for different sized aquariums. So, how do you find the right level of power for your tank?

Well, while it does vary on multiple factors, a good guideline you can follow is to have about 5 watts of power for each gallon of water in your tank. So, if you have a 50-gallon betta tank, buying a heater with approximately 250 watts of power would be ideal. That being said, if you live in a hotter climate or have aquariums in a heated area, you might be OK with a less powerful option as well.

Frequently Asked Questions

Let’s discuss a few frequently asked questions related to betta heaters:

1. How can I keep my betta fish warm?

The best way to keep a Betta warm is by using an aquarium heater. These heaters come in various shapes and designs and are highly efficient at warming up your tank and keeping it at a specific temperature. Although, be sure to find a device that suits your tank setup for the best results.

2. Is a heater good for betta?

Yes, a heater is very important for Bettas as they are often found in tropical conditions. Due to this, the fish are accustomed to warmer temperatures which usually require an aquarium heater to maintain. That being said, thanks to their tropical roots, these fish are also quite resilient to temperature changes.

3. Can betta fish get burned by a heater?

While it is not a common occurrence, yes, aquarium heaters can burn Betta fish. This is mainly caused due to the fish going too close to your heater and, in most cases, does not lead to severe burns. That being said, make sure your heater is not in a central location and has some sort of covering to avoid such burns.

4. How do aquarium heaters work?

Aquarium heaters work by using electricity with certain types of metals that are able to heat up. The heating of the internal metal gradually heats the device and, in turn, also the surrounding water in your tank. This continues until the water is evenly heated up and suitable for your fish to swim in.

5. Why is my fish staying by the heater?

The most common reason for your fish to be staying near the heater is uneven or improper heating of your tank’s water. It can be caused due to various reasons such as a faulty heater or even if your aquarium heater isn’t placed correctly in your tank. To fix this, try moving your heater to a different location or using a different one instead.

6. What is the best temperature for a fish tank?

The best temperature for most fish species are within 75 F to 80 F; they will be able to grow happily and comfortably. While there is no ‘best’ temperature for fish tanks as each species of plants and fish has different requirements, there are some common guidelines you can follow. Always be sure to check the requirements of your pets before deciding on a temperature.

7. Where should I place my aquarium heater?

The best position for your aquarium heater would be near flowing water. It could be near the filter or an air pump that causes water to flow around the tank. Keeping your heater here is beneficial as it will allow hot water to spread and evenly heat up your tank.


Best betta heaterAfter thoroughly testing the various options on this list, our choice for the best overall betta heater is the Fluval E100 Advanced Electronic Heater. It offers a comprehensive experience and takes care of safety, heating, efficiency, and convenience all at once. The credit goes to the multiple features packed into this device ranging from the fast heating technology to the integrated safety guard for keeping your fish safe.

Moreover, one thing we really like about this betta heater is how easy it is to use. For example, installing this device is quick and simple with the slim mounting bracket, and you can always attach and detach the device to it according to your convenience. Also, with a built-in LCD and east lever for temperature control, you can always change and track the temperature with minimal effort.

While this is our best choice overall, your decision will depend on your specific requirements as each heater has different advantages in different fields. With that, we hope this list helps you find the right heater for your betta tank.

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