Manual - http://www.blichmannengineering.com/...0Manual-V8.pdf
From the Notes on Southern Climates
"A good rule of thumb (assuming 5gpm of water flow) is that the TherminatorTM
will chill about 3-5oF above the cooling water temperature at moderate wort flow rates (about ¾-1gpm),
and about 10oF above the cooling water temperature at higher wort flow rates (about 1.5-2 gpm)."
Based off of that, I'm assuming that they expect a 5gpm flow rate from a hose bib. I just got a therminator for doing A.G. and have been really happy with it, however I do run a pre-coil sitting in an ice bath to chill down the cooling water, as I'm in Florida and the tap isn't cold enough to chill it.
If a 200gph pump is divided by 60 minutes, you get 3.33gpm pump, which isn't the 5gpm that Blichmann assumes. You may be able to squeak by if you set the pump into a cooler in an ice bath to get much colder cooling water temps, but do not re-circulate the hot water back into the cooler. I did that with a coil and small pump in the kitchen, as my faucet doesn't accommodate fittings, and putting the hot water back in slowed the whole cooling process considerably.