I was thinking the same thing..
Why couldnt a 22 qt pressure cooker
server double duty?
22 Qt last I checked was 5.5 gal only have to brew 2.5
I was thinking then you could tap the bottom and put a spout and thermometer on it like a brew keg.
Make the mash in it (And thus sanitized due to boiling)
Drain from spigot
Fill and get OG
Seal the pressure lid (Which has a built in vent for steam and on this model adjustable down to 5 PSI)
Sanitary, sealed from the light, all in one No mess and no fuss..
At less than $90 why not..? Beer is stored in Aluminum cans, so I can't see it imparting a metal flavor to the beer anymore than beer cans do.. or am I wrong and thats why its not done..
If Aluminium is an issue.. then why not take something like an 8 gallon SS brew pot
. Only thing needed would be a vent. As I think the weight of the lid would hold it down well, if not you could put a seal on it easy enough.
It would eliminate possible contamination going into the fermenter and as mentioned before, due to the boiling of the container it would definitely be sterile.