a little more than 4 gals of initial water to start (no sparge) depending on the grain bill that gets me close to 4 gals pre-boil vol after grain absorption.What pre-boil volume do you shoot for with a 2.5 gal batch? 3.5 into the fermenter?
Boil off is .75 gals (I need to double check but I think i need to boil at 60% power at 220v).
I am allowing for .33 gal trub loss
That leaves 2.75 gals into a 3 gal fermenter (I have a cheap conical and a DIY bucket. prefer the conical but need blow off tube.
That leaves 2.5 gals for the torpedo keg.
Two things. I am using the default water volumes in beersmith so I will need to verify with my actual numbers. Secondly, I should be cutting back my volumes 1 or 2 quarts. While the kegs are 2.5 gallons, I end up spurting beer around the room when I purge the keg and fill with a layer of CO2.
I prime my kegs and let them age/naturally carbonate in my fermentation mini fridge. I mini fridge kegerator is too small to hold more that one keg at a time which means I can only have one keg on CO2 at a time.