Originally Posted by MyNameIsPaul
I'd use the 15 gallon for the boil kettle so you can do 10 gallon batches if you prefer. I'd put a valve on all of them with camlock fittings, and thermometers on the HLT and Mash Tun. Sight glass on the HLT as well. Not needed on the BK because the liquid in the tube boils as well and you can't get an accurate read in my experience.
For 10 gal batch the 15 gal Keg is best especially if the recipe had a big grain bill.
If put a sight glass and thermometer on the hlt, thermometer on the mlt, and a sight glass on the bk. i don't have a sight glass on my bk but sometimes i wish i do.