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Home » Saltwater Aquarium Supplies  » Chillers  » Micro/Nano Chillers  »  CoolWorks Microchiller
CoolWorks Microchiller

CoolWorks Microchiller

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Item #:
MSRP: $215.99
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CoolWorks Microchiller Information

The MicroChiller provides a cooling solution for nano-reef tanks and other small aquariums that require cooler temperatures. The new MicroChiller not only solves the cooling problems inherent in nano-reef applications, but it also increases the flow of water in the tank that is necessary for the healthy growth of the coral. The MicroChiller uses solid-state heat pump technology, so there is no messy freon leaks or compressors that make irritating noises, which sets it apart from conventional chillers. Because the MicroChiller has so few moving parts, when used properly, it will provide trouble-free operation for many years. This compact chiller can chill bring down the temperature in a 10 gallon aquarium up to 4-6 degrees.  Use in conjunction with the Porportional Thermoelectic Controller (sold seperately).



  • 71/8" tall (entire probe unit)
  • Width 4 3/4"
  • Probe length (including bulkhead screw) 3 1/8"
  • Probe width 1 1/4"

Aquaclear 20

  • Maximum Output: 100gph
  • Full Flow Control: 33gph
  • Power Consumption: 6W



Manufacturer Info

CoolWorks Aquarium Supplies
CoolWorks IceProbe-powered chillers are the most effective way to cool small volumes of liquid. CoolWorks has been providing consumers and business with innovative water cooling proudcts for more than 10 years. The company was founded in 1994 and is dedicated to developing, manufacturing and marketing innovative thermoelectric products. The company was awarded a U.S. patent for their flagship product, the IceProbe, in 1996. The IceProbe was designed as an alternative to compressor-based cooling technology for small scale water chilling. While initially used for cold water dispensing systems, the IceProbe has proven very effective for cooling small aquarium systems.


Manufacturer Warranty (Iceprobe): 1 year

Manufacturer Manufacturer Warranty (Hagen Aquaclear): 1 year

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CoolWorks Microchiller Reviews

Average Rating
(16 reviews)
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of 2

Product great/packaging bad

Reviewers Rating Great

Posted: 8/3/2014 from SACRAMENTO, CA UNITED STATES
4.0 5
Experience Level: Intermediate

Comments: I purchased this after summer temps in my 10g planter freshwater tank started reaching 82F. It's worked every bit as well as I'd hoped, easily handling a 5F pulldown. The only hesitation I have in strongly recommending this is the packaging. The outer, Marine Depot box is well packed. The inner, original Coolworks packaging is terrible, with the heavy cooling unit loosely attached to the light plastic filter, and little surrounding protection. My order arraigned with a cracked filter body, and MD stepped up wonderfully, with a replacement at my door 48hrs later. It too, was terribly packaged, but thankfully usable.

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Works Well

Reviewers Rating Great

Posted: 1/19/2014 from WEEHAWKEN, NJ UNITED STATES
4.0 5
Experience Level: Intermediate

Comments: I use this in a 5 gal nano tank. The heat in my house is such that setting the thermostat so it's comfortable downstairs makes it boiling hot upstairs in the bedroom where my tank is. The water temp w/o the chiller was in the 80s and this product brought it down to low 70s overnight. My Fluval Spec 5 tank has a plastic cover that had to be cut to accommodate the unit and that took some effort. The chiller apparatus is almost silent but the water pump does make some noise.

0 of 1 People found this review helpful, did you? Yes No

Decent Tank Cooler

Reviewers Rating Average

Posted: 9/9/2013 from NORWALK, CA UNITED STATES
3.0 5
Experience Level: Beginner

Comments: The tank cooler has done a good job keeping the tank temperature from close to 90 degrees to down to close to 80 degrees in a 10 gallon tank. Also, like that the pump and cooler are two separate power sources. I have the cooler on the timer to turn off when the lights go off and the pump on all the time. Only two gripes are that water needs to be put into the pump reservoir to get the pump to start circulating water. The other issue was that it appeared that the product was not packaged in its original packaging so the top plastic piece was broken and cracked in multiple spots. Since I wanted to make use of the device I was able to glue the broken parts together and secure it so it works. A little disappointed in the quality of the plastic.

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Perfect for a small tank

Reviewers Rating Excellent!

Posted: 8/16/2013 from RIVERSIDE, CA UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: Very skeptical at first but this microchiller works great. My 20gallon tank was reaching temperatures of 86 once summer hit. I went to my local saltwater fish store and they suggested this microchiller. I got it and now it keeps my tank at a steady 78 (we keep our AC at 82). Definitely a good investment, I highly suggest this to anyone having trouble maintaining a good temperature during the summer.

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skeptical at first.

Reviewers Rating Excellent!

Posted: 4/30/2012 from CA UNITED STATES
5.0 5
Experience Level: Expert

Comments: I have to admit, I was very skeptical at first. But after some research online and lots of read reviews I decided to give this a try. Bought this for my 12 gallon reef in my office. Which i need to share with three PCs and a laptop so my office is usually really hot. my tank was at 83 degrees before this was set up, I also bought the coolworks temp controller since I did not want to deal with turning this on and off or setting it on a timer. was very easy to set up, set this up with out instructions in about 15 minutes. set this up on Friday afternoon and with in 45 min the temp dropped about to 81 degrees. its been running all weekend and now Monday morning its down to a cool 79.0 degrees. its only been three days, but so far so good.

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Works Great!!!

Reviewers Rating Excellent!

Posted: 7/10/2011 from MIRAMAR, FL UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: Don't know who came up with the idea of putting the chiller in the filter but it works perfect!!!

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It works great for 10 gallon

Reviewers Rating Excellent!

Posted: 5/31/2010 from DALLAS, TX UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: Before I purchased the microchiller, my 10 gallon planted tank usually reaches 80+ degree, which puts a lot of stress on baby tear plants and causes them to turn yellow and die. I am glad that I made this purchase. The microchiller came with the probe installed on a filter unit and a power supply. It's easy to install. It constantly lowers the tank temperature to around 75 degree even when the 65w light is on, with ambient room temperature of 85 degree. So far I am happy and hope that it can last a long time.

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Coolworks Microchiller

Reviewers Rating Unsatisfactory

Posted: 5/23/2010 from Gilberts, IL UNITED STATES
1.0 5
Experience Level: Intermediate

Comments: Doesn't seem to chill water much if any at all in my 24G tank. I felt with my finger and doesn't seem much cooler, maybe not at all than the non chilled water in my tank but the green LED is on which says it's working. I'm thinking of trying a regular fan or buy a standard chiller.

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Works well,after setup issues

Reviewers Rating Great

Posted: 9/25/2009 from WHEAT RIDGE, CO UNITED STATES
4.0 5
Experience Level: Intermediate

Comments: Starting from the beginning - we were really excited to find a small chiller appropriate for our 28gal Nano. When the Chiller arrived, we were disappointed to see that there were no instructions, diagrams etc.. in the box. It's not that it was hard to install, but there were a couple of small pieces that we weren't sure where they belonged. We checked on the CoolWorks website and found a diagram. Installing the chiller onto our tank required that we cut a section out of the back 'lip' so that the chiller would hang flat instead of at a angle, which caused it to suck air instead of water. The chilling effect is amazing. We have it set up to come on with our lights. We've only had the chiller for 2 days and we are having issues with microbubbles being produced when it is running and we have to cup water into the chiller to get is started. Tonight we'll be working on a resolution to both of these issues. The Chilling effect is so worth the effort, I'm sure we'll get everything working great with a little work.

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Reviewers Rating Excellent!

Posted: 5/17/2009 from ALVARADO, TX UNITED STATES
5.0 5
Experience Level: Intermediate

Comments: Takes all the worry and stress over running a 24 nano with HQI lights, I no longer have to keep my AC so low.

3 of 4 People found this review helpful, did you? Yes No

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