I've only had it for about a week but so far it has served its purpose and I'll be upgrading after a few months of use. I use this with a 50 gallon reef tank with a 15-20 gallon sump tank so maybe 70 gallons total. I bought it because my aquarium almost crashed at 85° water temperature. It gets hot here in Texas and keeping the air conditioner on all day when I'm out is just not cost effective. This chiller should pay for itself within a few months considering how much it would cost to run the air conditioner. The optimum temperature for my pool is 78°. This device allows you to set a temperature range so that it cools down to a certain temperature and then turns off until the temperature reaches the tolerance you set. I set a tolerance of two degrees, so I set the thermostat to 77° (in Celsius). This means it will work until the temperature in the tank reaches 77°C and it shuts off. Then when the water starts to warm up, it turns on again at 79° and cools down to 77°. Thus, the device does not work continuously. The two holes on the top of the device are interchangeable as both can be used for entry and exit. The device itself does not have an internal pump, so an external pump is provided for water circulation. I have the pump in the sump drain compartment and the drain hose in the return compartment. That appears to be enough for separation, so it's not already chilled cooling water. You have enough 1/2" tubing for two 5-foot sections and two clamps. Be sure to leave enough clearance around the unit to allow for good airflow. The air that exits the back is quite warm as it is pulled warm from the water. Cool air enters through the sides. Also be sure to calibrate the thermostat as directed using a reliable aquarium water thermometer and set the unit accordingly. Mine was off for around 2.00am °, but really corrected.
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