My system was about 160 gallons total and it did fine.
This is the specs from the manufacturer website
CL-650 1/4HP Aquarium Chiller unit.
Heater control addition included.
High quality, durable, completely enclosed. Digital control. Titanium heat exchanger.
db rating 42
Water flow 600gph minimum/1000gph maximum.
220V models available
Hose connections 5/8" or 3/4"
11.5"L x 15"W x 17" H
2 Degree swing
On/Off switch
10 degree cooling up to 180 gallons
30 degree cooling up to 100 gallons