The steam setup on
http://www.brewingtechniques.com/library/b...e2.4/jones.html seems to be a the norm for 23-25 L batches, as US forums on this topic seem to link it back to that site.
I also found the steam stirrer, which the guy calls a SIMM (Steam Injected Mash Mixer) @
http://www.gjwspykman.com/simm/simm.html seems pretty complicated and in my view overkill.
Be prepared for fair whack of photos
Another thing you may consider, is instead of using a pressure cooker you could use a wallpaper steamer, which the SIMM guy uses
""A fully enclosed system using pressurized steam", that was exactly
what I wanted. And I knew where to get one. Lucky for me a local tool
rental company was going out of business and I was able to get a
great deal on a...have you figured it out yet? A wallpaper steamer!
It's perfect, I just fill it with water, plug it in, wait about half
an hour, and I have steam delivered safely at 12 psi. via a rubber
hose with standard air hose quick connect fittings." (http://hbd.org/hbd/archive/4586.html#4586-4)
Cheers
Will