6 Best Aquarium Heaters (2022 – Reviews)

Some aquarium owners tend to ignore the importance of an aquarium heater. Just imagine yourself living in the coldest part of the world without a heater. What would you think will happen? It’s the same with your pet fishes. If the temperature in the aquarium is too cold or too hot for the fishes, they might die.

The primary function of the heater is to keep the water at the right temperature. The best aquarium heaters can safely do this without hurting the fishes. In this guide, you will learn why the aquarium heater is vital for your tank. Choosing the right aquarium heater is not an easy task. This review was written to help you decide, so you will not end up buying the wrong item.


Best Aquarium Heater Product Reviews

Here are six aquarium heaters that you can consider buying that is worth your money.

1. Hygger Mini Glass Aquarium Heater

Maintain the right temperature in your aquariums or fish bowls using the Hygger Mini Glass Aquarium Heater. It is made of shatterproof quartz glass, which makes it very durable. The glass aquarium heater is protected against punching and scalding.

Your fishes will have the perfect water condition for your fish and turtle. It can support tanks and bowls with up to 13 gallons of water. To control the temperature, it has an exterior button, so you don’t have to submerge your hands in the water. You will know the heater is working once the red indicator light illuminates.

Hygger Mini Glass Aquarium Heater has run dry protection that automatically shuts off once you remove it in the water to make sure your pets are safe, particularly the frog and turtle. Once the water reaches the desired temperature of heat, the red light will shut off.

Things We Liked

  • With automatic shut off feature when it reaches the right temperature
  • Made of shatterproof quartz glass
  • Has a light indicator that illuminates when working and turns off when it achieved the desired temperature
  • Can be used both in freshwater and saltwater

Things We Don’t Like

  • Pressing the set button may increase the temp by one, and there is no way to decrease it.


2. Freesea Aquarium Fish Tank Submersible Heater

The Freesea Aquarium Fish Tank has a unique shape that can provide a constant automatic temperature. It can heat the water up to 940 F, and it is recommended for tanks up to 35-gallons. You can set the temperature by just pressing the button, and it has a bright LED display, which lets you quickly see the temp.

This brand is available in four different sizes, so make sure that you get the right size when buying. The company offers a 12-month warranty, too, and it has a 3.5-foot cord. The temperature can be set on both Fahrenheit and Celsius.

There is a warning on using this heater. The manufacturer suggests that a wave makes to enhance heat flow, and because of the design, some fish might slip behind it and get stuck up.

Things We Liked

  • A unique oval shape that makes it different as compared to other heaters
  • Temperature can reach up to 940 Fahrenheit, and it is recommended for 35-gallon tank
  • Bright, LED display
  • Automatic and easy to control the temperature with the touch of the button

Things We Don’t Like

  • Fish gets attracted behind it and get stuck
  • Instructions are not included in the package


3. FREESEA 25W/50W Aquarium Heater

This 25 Watt heater is best for one to five gallons of aquariums. It has an LED temp display, and it is completely submersible. The Freesea Aquarium Fish Tank measures 2.5 x 1.5 x 3.5 inches with the electrical specification for this product. The power cord is 4 feet long, so it is best to choose the perfect wattage aquarium heater based on the size chart.

The temperature ranges from 630F to 950F. Adjusting the temperature is very easy. A free diving thermometer can monitor the water temperature of the fish tank. With its automatic constant temperature feature, the heater will stop heating instantly when it reaches the specified temperature value. When the water is at the lowest, the heater will start heating again.

The heater is 100% submersible, and it should be submerged in the water during the heating time. If you need to clean the fish tank or aquarium, make sure to unplug the power supply first. The manufacturer offers 24-hour professional after-sales service and12-month warranty. Freesea 25W/50W Aquarium Heater is the best aquarium heaters for small tanks

Things We Liked

  • Automatic shut off when the right temperature achieved
  • One year warranty and the 24-hour professional after-sales
  • Longer power cord
  • Has LED display to read the temperature easily

Things We Don’t Like

  • Not recommended for bigger fish tank or aquarium


4. Mylivell Aquarium Heater

The Mylivell Aquarium Heater is one of the affordable fish tank heaters in the market today. This is recommended to hobbyist fish keepers who are in a tight budget. Not because it cost less, it means it does not have the features you need.

This heater meets all your aquarium heating expectations at an affordable price. It adjusts the temperature automatically to make sure your fish is comfortable. The fact that the temperature ranges from 20 to 34-degree centigrade means it will offer the best living condition for both freshwater and saltwater fish.

This aquarium heater also comes with a fully submersible design. Its power rating is 200 watt and can heat up the fish tank up to 20 gallons.

With its advanced design features and quality quartz design with double seal material, operating this heater is easy and safe as compared to its competitors. To make the installation hassle-free, it includes two suction cups. It has a polarized plug that prevents electrical shock.

Things We Liked

  • Automatic temperature control
  • Durable Construction
  • Affordable
  • Includes two suction cups for hassle-free installation
  • Safety Shut off

Things We Don’t Like

  • It does not work that much in a vertical position.


5. Eheim Jager Aquarium Thermostat Heater

This high-quality aquarium heater is available in nine different sizes from 25-300 watts. It can accommodate tanks of up to 150 gallons. One worth noting about this brand is that the heater gets longer as the wattage increase. In short, a 50 watt Eheim Jagar heater can heat longer as compared to the 25-watt heater. This heater has a thermostat that you can adjust easily if needed.

The construction is very durable because it is made of shatterproof glass. This heater is free of pollutants, resistant to biological and chemical substances, and can withstand the extreme temperature fluctuations. Its glass jackets likewise enlarged the heating surface and assured that the heat is distributed evenly.

Eheim Jagar Aquarium heather thermo safety control mechanism shuts off automatically when it is dipped out of the water and turns on automatically when placed in the water. For easy installation, the Eheim Jager Aquarium has two suction cup, a power cord, and a mounting bracket. It can be used both on freshwater and saltwater.

Things We Liked

  • Available in 9 different sizes
  • Applies thermo safety shield technology
  • TruTemp dial for adjusting the temperature
  • Mounting bracket and suction cup for easy installation

Things We Don’t Like

  • Higher wattages can be long and can lead to overheating.


6.  Aqueon Pro Heaters Submersible Aquarium Heater

This adjustable aquarium heater is a popular aquarium heater. This is a top-tier fish tank heater. The electronic thermostat has an accuracy of one degree with the predicted range of 68 degrees Fahrenheit and 88-degree Fahrenheit.

Aqueon Aquarium Heater has shatterproof construction, which makes it very durable. It is also completely submersible. It is best to position the heater near the tank’s filter outlet for even distribution of heat. This aquarium heater also offers several safety features.

It works best in a freshwater aquarium and can accommodate up to 150 gallons. The heater shuts off instantly when the needed heat is achieved. This prevents the aquarium from overheating and keeps the temperature in the right condition longer. The heater automatically turns on once the temperature goes below the needed temp.

Things We Liked

  • Shatterproof-construction which makes very durable
  • Thermostat accuracy of one degree
  • An LED light that turns on /off automatically for controlling the water temperature
  • Completely submersible

Things We Don’t Like

  • Housing is black instead of clear.


Buying Guide – Factors To Consider When Buying An Aquarium Heater

Are you having a hard time choosing an aquarium heater? We understand your sentiments, so we have written this buying guide to help you out. Below are some of the essential factors that you need to consider when choosing an aquarium heater.

Size of Aquarium

It is essential to consider the size of the aquarium before buying an aquarium heater. If you notice, we have included the aquarium size that will fit their specific model. For small aquarium owners, it is best to choose between 50W to 100W size, depending on the tank size.

For a bigger aquarium, you can choose the one that can accommodate up to 200 gallons. If you love variety, select your preferred size from the 25-300 watt.

Type of Aquarium

Do you have a saltwater or freshwater aquarium? What kind of aquarium you have a reef tank, turtle tank, or beta tank. Makers of tank heater always suggest the type of aquarium that fits their heaters. Some models can be used both on the best freshwater and saltwater.

Types of Aquarium Heaters

There are different types of aquarium heaters that you can find in the market today. Some of these include a submersible heater, in the sump, the substrate aquarium heater, in line, in the filter, and immersible. You must know how each type of aquarium heater works. Most fish tank owners use submersible heaters since it provides the desired result.

Ease of Maintenance

No matter how durable the aquarium heater is, there would come a time that you will encounter maintenance issues. That is why you need to choose the one that is easy to maintain. Pick the one that is easy to clean or has replaceable parts when broken or damaged.


You should determine how much you can spend on an aquarium heater. This will determine the quality and the type of heater you can buy. Keep in mind that not all expensive fish tank heaters are made of high-quality material, and not all cheap heaters are made of low-quality material. All you need to do to find the best is to carry out some research and read reviews before buying.


This is one of the essential factors that you need to consider. Choose a fish tank heater that is highly durable, and you can use longer. Also, find a product that is made of shatterproof material and with a waterproof design.

Adjustable Temperature

You are buying an aquarium heater to make sure the water is warm and comfortable for your fishes. You must choose a heater that you can control the temperature to ensure the safety of your pets. The control must be easy to understand and simple. But, there are lots of models that feature automatic shut off/on when the water reaches the desired temperature.

Safety Measures

When buying an aquarium heater, you need to consider how safe the aquarium heaters are. One it should be no risk of electrocution, the device should keep the water temperature stable, and there should not be any fluctuations that can be dangerous to fishes.


Final Thoughts

After reviewing six of the best aquarium heaters, we find Hygger Mini Glass Aquarium Heater as the winner. This brand is known for manufacturing quality fishing items. Its automatic shut off/on features keeps your fishes safe and comfortable.

About the price, the Hygger Mini is very affordable. The temperature is adjustable, so you can easily regulate the heat your fishes require. Hygger Mini can be used both on saltwater and freshwater. If you want to share your thoughts about the topic, feel free to comment below.