You dont need a sump to have a chiller.
Mine is plumbed directly from the tank to the chiller and the return goes directly into the top of the tank via a mag pump. It also adds a little more water motion to the reef that way.
Its rated at 600-1000 Gallons per hour and can chill a 100 gallon tank up to 30 degrees or a 180 gallon tank up to 10 degrees and has a digital display.
Its measures 11.5"L x 15"W x 17" H and mine sits by the side of the tank
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