I have my pump between the kettle and the plate chiller. First tubing leg from the kettle/mash tun goes to the pump, then it goes wherever it needs to from there. I had no issue with this model when recirculating the boiling wort to sanitize the chiller. It also allowed me to continue to use the ball valve on the chiller to regulate the flow from it. This allows me to get the temperature from the plate chiller exactly where I want it to be.