I scaled it up to my usual 6 gallons but the 120 minute boil time sort of threw off some of my calculations. I sent too much sparge water through so I had a wasted 2.5 gallons of 1.008-1.010 wort from my final runnings. I sent 10.5 gallons to the kettle thinking I would get somewhere close to 2 gallons an hour boil off and leave some behind with the trub in the bottom. I ended up with 7.5 gallons of wort so I only boiled off 3 gallons.
I guess I could have boiled a little longer since I my OG on transfer to the fermenter was 1.041, about two points lower than I wanted. It was late, I was tired, and the hops were already in for 60 minutes.
I think my problem was really cold temps so my boil may not have been as "VigOrous" as it normally would have been. I could not keep the propane tank warm and up to pressure. When I would shake the tank the burner would pick up and the boil would roll a little harder. I even took to hitting the outside of the propane tank with the mapp gas torch for a few seconds to warm it up. It was cold enough my garden hose froze solid to the chiller so I had to lift the kettle and drag it in side so the hose from my filter could reach the supply side of the chiller and run it off the sink.
I am still dialing things in for a few new parts of my system. I have only used this kettle (converted keg) 4 times and my new mashtun (10 gallon Igloo with manifold) 3 times. I think my efficiency is a little higher than I planned for and my boil off was certainly lower than planned. Regardless I am still thinking good beer!


