10 Powerful Aquarium Chillers That Give You Precise Control Over Your Water Temperature

BEST OVERALL

PREMIUM CHOICE

Chill Solutions 11415 Thermoelectric Aquarium Chiller

GREAT VALUE

LONDAFISH Aquarium Chillers Aquarium Fan Fish Tank

Is the temperature of your fish tank off by just a smidge? For your aquatic friends to thrive in their environment, the temperature needs to be just right for them. This will vary depending on the tank setup you have and the type of fish you keep. However, if you’re looking for a slight temperature difference to cool your fish off, a chiller may be a good option. We took a look at the 10 best aquarium chillers to make the decision easier for you.

Table of Contents

BEST OVERALL

Active Aqua AACH25HP Hydroponic Water Chiller Cooling System

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This aquarium chiller from Active Aqua is an excellent choice for several reasons. To start, you can use it for any type of fish tank, such as freshwater setups or saltwater. You can set the ideal temperature to whatever you want your fish tank to be at, and the chiller will do the rest. Once the perfect temperature has been reached, it will continue to maintain that temperature until you change it or turn it off. This is an external chiller that will sit outside your aquarium, but it has a quiet operation, and easy to install. Also, this chiller also has anti-corrosion, so the inside of it won’t get gross after many times of use.

What We Like Most

Has anti-corrosion

Suitable for freshwater and saltwater tanks

The temperature is maintained when the ideal temperature is met

Quiet operation

Easy installation

Our Synopsis:

This aquarium chiller is versatile and sturdy, as well as quiet and easy to manage.

Analyst Rating

PREMIUM CHOICE

Chill Solutions 11415 Thermoelectric Aquarium Chiller

Read Customer Reviews Here »

This chiller is a bit more compact than some of the others on this list. It’s suitable for many different sizes of fish tanks, from nano tanks to over 30 gallons in size. The cool pulldown will depend on how big your tank is. For example, a 10-gallon tank will be cooled by about 10°F whereas 20 gallons will be cooled by 5°-8°F, and a 30-gallon tank will cool about 2°-4°F. However, you can set the temperature of your tank’s water anywhere from 45°F to 90°F based on the type of aquarium you have and what your fish need. There is an LED display that will show you the current temperature of the water. This chiller is easy to set up and use.

What We Like Most

Has an LED display for the temperature

Can set the temperature from 45°F to 90°F

Cool pulldown depends on the tank size

Suitable for nano tanks or over 30-gallon tanks

Easy to use and set up

Our Synopsis:

This chiller can be used in many different setups, and its ease of use and control is great to have for beginners.

Analyst Rating

GREAT VALUE

LONDAFISH Aquarium Chillers Aquarium Fan Fish Tank

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The aquarium chiller from LONDAFISH is adjustable in a few different ways. It has two fans attached with two different wind speeds. You can adjust how fast or slow you want the fans to go depending on how much you want to cool down your tank’s water. This chiller will decrease your water’s temperature by about 2°-3°C. In addition, it includes an adjustable angle. You can control where the two fans face separately. One fan can be facing the water while the other can face away based on the fans’ speed and the temperature of the water. This chiller is also energy-efficient, which is great, and it’s easy to set up. This is an ideal chiller for beginners.

What We Like Most

Has two wind speeds

Includes an adjustable angle

Reduces the water temperature by 2°-3°C

Energy-efficient

Easy to set up

Our Synopsis:

This chiller is simple to use and easy to set up and maintain. It’s perfect for beginners.

Analyst Rating

4

Petzilla Aquarium Chiller, Fish Tank Cooling Fan System for Salt Fresh Water

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Petzilla has an aquarium chiller that is versatile for freshwater and saltwater fish tanks. It will reduce the temperature in the water by about 2°-4°C. You can control the wind speed based on what your water needs inside your tank. The fans will clip on the edge of your tank, and they have a 90° angle adjustment so you can control where you want the fans to blow into your tank if at all. This chiller comes in a couple of different sizes, depending on your tank setup. You can get this aquarium chiller with one, two, three, or four fans. Depending on how long or large your tank set up is, you can choose to get more than one fan for your fish. This one is simple to use, and it’s easy to install and maintain.

What We Like Most

Has a 90° angle adjustment

Clips onto the aquarium wall

Reduces the water temperature about 2°-4°C

Can control two wind speeds

Easy installation

Our Synopsis:

There are many options that come with this aquarium chiller, and it’s easy to use and maintain.

Analyst Rating

5

DaToo Aquarium Chiller Fish Tank Fan Aquarium Cooling Fan

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This aquarium chiller from DaToo will cool down your water’s temperature by about 4°-6°F. It has two fans that you can easily adjust depending on where you’d like to cool down the water. It does have two different wind speeds that you can control as well. This way, if your water is at a reasonable temperature, you can slow the wind speed down just a bit so that the temperature can be maintained well enough. Regardless of the wind speed, these fans will operate quietly, and they won’t distract you in that way. It’s also energy-efficient so that it won’t boost your electricity bill too much. This chiller is easy to set up, and it’s simple to use and clean as well. This is another excellent choice for beginners.

What We Like Most

Has two wind speeds

Will cool 4°-6°F of your water temperature

Quiet operation and energy-efficient

Comes with two fans

Easy to set up

Our Synopsis:

This aquarium chiller is another one that’s simple to install on any tank.

Analyst Rating

6

IceProbe Thermoelectric Aquarium Chiller

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This is a great aquarium chiller from IceProbe. It’s on the smaller side and compact compared to some of the other chillers on this list. Due to its size, you can use more than one of these chillers for a single tank if you have a more extensive setup. It’s quiet during operation and is energy-efficient while it works. If you do have more than one for your tank, then this will do the job perfectly. It will cool about 6°-8°F for 10-gallon tanks, 3°-4°F for 20-gallons tanks, and 1°-2°F for 40-gallon tanks. It also comes with a separate controller to control the temperature and how much you want it to cool down your aquarium. This is a simple chiller to install, as well.

What We Like Most

Quiet and energy-efficient

Comes with a separate controller for the temperature

Will cool about 6°-8°F for 10-gallon tanks

Can use more than one for a single tank

Easy to install

Our Synopsis:

If you’re looking for something smaller that will still get the job done for any aquarium, this chiller is a right choice.

Analyst Rating

7

BAOSHISHAN Aquarium Chiller

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This chiller from BAOSHISHAN is another external one on this list. What’s great about this one is installing it using three different methods based on your tank set up and what’s most comfortable for you. It can be placed outside the tank, connected to the filtration system, or connected to the water pump. This chiller is extra great because it will filter out the dust and other particles from the air so that nothing goes back inside your tank water that’s unwanted or will harm the water or your fish. You can use this chiller, whether you have a freshwater tank or a saltwater tank. It also saves energy while it works, which is great. This chiller is a bit bigger than some on this list, but if you have a room, it’ll get the job done well.

What We Like Most

Energy-saving

External chiller

Three installation methods

Filters out dust from the air

For use in a freshwater or saltwater tank

Our Synopsis:

This is a good chiller to have if you need a couple of options to set it up.

Analyst Rating

8

Hamilton Technology Aqua Euro Max Aquarium Chiller

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This aquarium chiller from Hamilton Technology is a good choice as well. This one has a few bells and whistles with it. It’s a larger chiller that will sit outside your tank, but it comes in four different sizes depending on your tank’s size and what flow rate you need. It has an LED display for the current temperature to always know how the water is doing and how your fish are. When the ideal temperature is reached for your tank, this will maintain the current temperature to ensure that your water and fish are getting what they need. It’s energy-efficient when working, and it’s also easy to set up and clean. The best part? It comes with an anti-freezing system so that the heat exchanger won’t freeze the temperature memory.

What We Like Most

Has a digital LED temperature display

Energy-efficient

Includes an anti-freezing system

Comes in four sizes

Easy to set up and to clean

Our Synopsis:

This chiller is another durable option that is simple to set up and clean.

Analyst Rating

9

JBJ Artica Aquarium Chiller

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This aquarium chiller from JBJ is another great option for beginners. This in-line chiller will sit outside of your tank and be hooked up to your air pump, and the two of them will work together to cool down the temperature of your fish tank water. It has titanium coils on the inside so that it is efficient in heat exchanging. It’s also energy-efficient and super quiet when working. It’s resistant to corrosion, so it should have a long service life for you and your fish. It’s easy to set up and maintain, which makes it a good choice for beginner fish keepers. This particular chiller will work great for smaller aquariums that are up to 40 or 50 gallons in size.

What We Like Most

In-line chiller

Corrosion-resistant

Has titanium coils

Quiet and energy-efficient

Easy to install

Our Synopsis:

If you have a smaller aquarium set up, this is a good chiller for you.

Analyst Rating

10

YueYueZou Aquarium Chillers Cooling Fan

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This particular aquarium chiller from YueYueZou is an optimal choice since it’s easy to install and maintain. It’s a simple chiller that will clip onto the edge of your aquarium. You can adjust the angle as well so that you can have both fans or just one fan facing the water, or you can have no fans facing it depending on the temperature. You can also buy this chiller with one or two fans attached based on how big your aquarium is. There are two different wind speeds that you can control as well. This chiller will work in multiple other tanks, so you can use it for your freshwater fish or your saltwater fish. Plus, it’s easy to install and to maintain.

What We Like Most

Can include one or two fans

Has two wind speeds

Includes an adjustable angle

Suitable for saltwater and freshwater tanks

Easy to install

Our Synopsis:

This is a simple aquarium chiller that is easy to use and will get the job done.

Analyst Rating

Buyer's Guide

Aquarium chillers are, in a nutshell, the opposite of an aquarium heater. However, there’s less control over the temperature, and it will only cool your tank’s water down by a degree or two. This can work with the aquarium heater or without, but it will still maintain your aquarium’s water temperature pretty well. When searching for the right one to buy for your tank, there are a few things to keep in mind, such as the chiller’s flow rate, the energy it uses, and the noise levels of the fans. Let’s take a closer look at some of these features.

Flow Rate

Flow rate is important for a lot of things when it comes to fish keeping. This means how much water flows throughout the tank and the filter by gallon per hour. For example, if your filter says it has a flow rate of 25 GPH then that means it filters through about 25 gallons of water per hour. Depending on the size of your tank, you’ll want a chiller with a high flow rate or a low one. It needs to have the correct flow rate for your aquarium or else the chiller won’t be able to do its job properly. If the flow rate is too fast or too slow depending on the gallon size of your fish tank, then your chiller will have a hard time keeping up with the temperature. It will cool down your aquarium, but it may not work as efficiently and it will be difficult for it to maintain the right temperature of the water. This will depend on whether the chiller can keep up with the flow rate or not. In addition to this, be sure to get a chiller that will correspond with the same size as your aquarium. You do not want to use a chiller that works well for aquariums up to 200 gallons in size when you only have a 30-gallon fish tank.

Energy Usage

When your chiller is on and it’s hard at work, it’s using electricity to work through the aeration, absorbing heat, and releasing it back out into the air so your fish can be a bit cooler. These chillers are normally energy-efficient but you need to watch out for this. Every home is different and everyone’s budgets are different as well in terms of the electricity bill. Not to mention, you want to make sure that the chiller is using just enough energy to get the job done and it’s not over-exerting itself and possibly overheating. When searching for the right aquarium chiller for your fish tank, keep an eye on the watts and the energy usage. Be sure that it’s energy-efficient and that it won’t overheat if it’s working too hard. This will also ensure that your chiller gives you a long service life, too. The less energy it uses, the easier it will work, thus lasting longer.

Fan Noise

Finally, you want to make sure that the fan noise is limited or non-existant when the aquarium chiller is working. Most of the chillers on this list are ultra-quiet when they’re operating. However, you want to double check and make sure that it won’t disturb anything or anyone else in the house, depending on where your fish tank is. Of course, this is n’t necessarily a must when it comes to choosing a chiller for your aquarium. It never hurts to look into it though. A loud fan speed can get old and annoying pretty quick.

How does an aquarium chiller work?

Aquarium chillers will remove the heat from your tank’s water and transfer it somewhere else—this is where the “heat exchange” comes in. The water will get heat removed from it, thus cooling it off by a degree or two. There are a couple of different parts that make up the aquarium chiller, and the heat exchanger is one, also known as the evaporator. This is where the cooling process begins. The heat from the aquarium water gets absorbed by the liquid refrigerate, which evaporates into the coils. These coils are called the condenser coils which hold the temperature for the process. Another part of the process is called the compressor. This is where the liquid refrigerate comes from. The compressor pumps the refrigerate to the condenser coils which raises the pressure and the temperature, thus giving up the heat and dispersing it into the air. The fans then blow air across the condenser coils, cooling it off and removing the heat. There is also an expansion valve which will reduce the temperature as well as the pressure of the liquid refrigerate as it goes back into the heat exchanger. Now that the coils are chilled, the refrigerate will flow over them, thus getting chilled itself and cooling off the water inside the tank. Most of these aquarium chillers will work with freshwater as well as saltwater fish tanks because the components of the chiller are prepared for saltwater. Most often than not, the chiller will be made with titanium coils. This will ensure that the chiller can resist corrosion due to the salt from the saltwater passing through. Overall, aquarium chillers are their own process and have a cycle to maintain in order to chill the water in your fish tank.

How do I clean the aquarium chiller?

Before you do anything with your aquarium chiller, you should always make sure that it’s off and unplug it for a couple of minutes to ensure that it has had time to sit and cool off for a bit. Not all, but some aquarium chillers will conduct heat and warm up pretty fast and you don’t want to hurt yourself when trying to clean this machine. If you're using your chiller for a freshwater tank then cleaning it will be a cinch. All you need to do is rinse the chiller with water until it looks visibly clean. Saltwater, on the other hand, will require a bit more cleaning. Essentially, you’ll clean the chiller the same way with a saltwater tank setup. However, there might be some calcium deposits on the inside because of the salt. All you need to do with this is clean it with vinegar. Since nothing substantial is going back inside the water through the chiller, this will not harm your fish or the water of the tank. You can use vinegar to rinse the chiller as you would with water until it’s visibly clean. Then you can put it back together and set it back up to run again.

Where do I place my aquarium chiller?

Aquarium chillers need to be placed in an area that has plenty of airflow. Since the chiller cannot add cool substances to the tank’s water but only take the heat, that heat needs to go somewhere else. It gets released back into the air, naturally. So, if you place your aquarium chiller inside your aquarium stand, for example, which is under your tank and in an enclosed space, then the heat is going to remain in that enclosed space. This is going to cause the heat to sit there, potentially reheating your aquarium again from the bottom. Otherwise, your chiller will spendmore energy trying to cool off your water only to put the heat back into the tank. Ideally, you’ll want to have at least a foot or two of proper space with optimal airflow around the entire chiller. There are also some chillers that will clip onto your aquarium. There are some of those chillers on this list and they work just as well. The fans can be directed toward the water’s surface of your fish tank or they can be directed elsewhere. A lot of those chillers will have adjustable angles and they will also come with multiple wind speeds depending on what you need for your time and you may be able to get multiple fans going at once as well. Also, you’ll want to make sure that your chiller is in an easy-to-reach place as well. This will make it so you can check on it from time to time to ensure that it’s still working properly and for you to do routine cleaning for it. You’ll also want to make sure that it is in a spot that is easily accessible to an outlet (because you need to plug it in, of course) but that the electrical wires won’t come into contact with the aquarium water or accidentally cause any damage or incidents.

Expert tip

Always place your aquarium chiller in a well-ventilated area to ensure proper aeration.

Did you know

Aquarium chillers act as a small refrigerator for your tank.

Conclusion

Finding the right temperature for your aquarium is tricky. You can have heaters, and then there are also aquarium chillers to ensure that the temperature is just right for your fish. We hope this list of our top best aquarium chillers will make the decision easier for you.