I don't know for sure, but I'm guessing it's around the 600-1000 gph area since it is designed to work with the QuietOne pump which I believe has that much output.
Thanks for the reply. That was the answer I was hoping to hear.
Basically what I'm thinking about doing(should have posted this originally) is to build a new "closed loop" system without any sump. My big problem was heating. If I can plumb one of these heater modules inline with my closed loop then I don't have to have an ugly heater in my tank. I was also thinking about adding one of the chemical modules as well to have the option of adding carbon, or any other product if needed.
Skimming would be via hang-on. Most likely a Remora Pro.