My friend has asked me to brew a hefeweizen for his house warming party. He has a sankey kegerator that he plans to use for the party, and would like me to brew 15 gallons to fill an empty 1/2 barrel.
The 15 gallon recipe calls for 20lbs of white wheat malt and 11lbs of pale 2 row. 31lbs total. This grain bill will not fit in my 10 gallon rubbermaid MLT nor will I be able to brew 15 gallons in my keggle. I have a 15 gallon fermenter, but I will probably put 5 gallons in a carboy to leave adequate headspace.
How do you guys recommend brewing this?
I'm thinking it would make sense to mash the 20lbs of wheat, and then sparge until the keggle is full to about 13 gallons. Then add extra light DME to the wort to make up for the 11lbs of pale 2 row. Boil as usual and then at flameout add water to the keggle to bring the volume up to 15 gallons (cooling the wort at the same time) and then transferring and pitching.
Anyone else do something like this, is there a better way?