JBL Cooler 100
Cooling fan for fresh- and saltwater aquariums

  • Cooling of the water temperature by 2 – 4 °C: cooling blower with ventilators for aquariums
  • Easy to install on the aquarium rim: thickness max. 2.5 cm. Switch on by means of toggle switch on the casing
  • Water cooling by air flow at the water surface, evaporation of the warm water. Expandable with BL CoolControl
  • Safety: 12 V small voltage, safety cover grid. Universal power supply for all common mains voltages worldwide
  • Package contents: cooling fan for aquariums, Cooler
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Recommended retail price incl. VAT
Available from your specialist dealer.
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You can find this article at your specialist shop and online
Product information

Temperature control
There are two important factors which affect the water temperature in the aquarium: firstly the room temperature and secondly direct sunlight. If the room temperature in summer increases significantly, it is important to check the temperature in the aquarium regularly. It should be 24-26 °C. Temperatures above 30 °C are a problem and can cause substantial damage to fish and plants. Furthermore aquariums should never be exposed to direct sunlight. The higher the temperature, the less effectively the oxygen, which is vital for the animals, dissolves.

Easy to install
The bracket of the cooling fan is placed onto the aquarium rim (up to max. 2.5 cm thickness) and fixed with clamp screws.

Cooling by evaporation
The JBL cooler for freshwater and saltwater cools down by 2-4 °C with the help of 2 fans. The fan makes the warm water evaporate at the water surface and thus generates cold. Comparable to evaporation cooling of a wet body part which is exposed to the wind.

The water cooler has a safety cover grid and is operated with a low voltage of 12 V.


JBL Cooler 100

Art. no.:
EAN Code:
5,5 W
60-100 l
Volume packaging:
2.800 l
Gross weight:
461.000 g
Net weight:
359 g
Weight factor:
170/75/220 mm

Technical Data

The JBL CoolControl does not switch off when it reaches the set temperature.

Please check whether the setting switch is set to “Auto”. The control unit does not switch when set to “Manual”.

Does my CoolControl work with every aquarium aerator/cooler?

The JBL CoolControl was designed for use with the JBL Cooler, and they work together perfectly. Due to different voltages, flawless function cannot be guaranteed for use with appliances from other manufacturers. Even the connector, which is optically identical at first glance, may be of varying thickness. As a result, a cooler from a different manufacturer may cause unwanted switching, leading to noises in the relay.

Blog – Opinions & Experiences


Caution, Summer Heat! A Reason for Scaremongering?

You can’t prevent the temperature in your aquarium from rising. No matter what measures you take your living room will warm up on hot summer days and can even go over 30° C. So what can you do?

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Cooling Aquariums – Summer Heat in Aquariums

Summer means sweat, because even within our homes the temperature rises steadily. This can also be discerned in the aquarium.

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Now even more safety with the free JBL GarantiePlus

Buyers of JBL technical products can rest even more on the safe side now because JBL is offering them a guarantee claim for two additional years free of charge. Just register your product online within the 2-year manufacturer guarantee ...

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The JBL Cooler Test

JBL took the first heat wave as an opportunity to test the JBL Cooler at high room temperature.

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JBL is truly cool!

Summer and winter are a good thing, but not for aquariums! JBL provides a remedy with its cooling concept.

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Laboratories and calculators

Water Analysis Online Laboratory

Enter your water parameters and get an in-depth analysis of your values in a matter of seconds. You enter your water values – and we analyse! Here you have the opportunity to enter the measured water values directly into the JBL Online Laboratory. This will analyse your values and explain and submit corrective measures.
Worth reading

Setting up an aquarium

Here you will learn how to set up your aquarium. In the film we show you the step-by-step instructions. The brochure “Setting up an aquarium” contains all information you need when setting up a new aquarium.


With the guarantee extension JBL GarantiePlus you secure your extra-long extended 4-year guarantee from the date of purchase for your JBL product. Do not miss out on your extended guarantee claim!


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