Description from Penguin Chillers 

Pump Sizing:

Up to 2 BBL – Standard pump

Up to 4 BBL – XL Pump used with 3/8″ tubing

Up to 10 BBL – XL Pump used with 1/2″ tubing

Standard practice is to use one pump per fermenter or vessel that you wish to cool. In this setup each pump is plugged into its own glycol pump controller. Each controller independently monitors each fermenter or vessels temperature and turns the pump on/off accordingly to regulate the temperature. The controller on the glycol chilling unit itself will regulate the temperature in the glycol reservoir ensuring that there is always cold glycol on hand to be sent out as needed in order to cool the fermenters.

The pumps work great for brewers that cycle their pumps on & off or choose to run them longer during a cold crash.  We do not recommend them for any application that requires the pump to regularly run for extended periods of time without cycling. This includes draft systems, or brewing setups wanting to use a header line and solenoid valves.  The occasional 8 straight hours of run time shouldn’t be an issue. However, running the pump in 8 hour blocks 7 days a week is going to significantly shorten the life span of the pump.