Here are the meager beginnings of my corny keg boiler:
From left to right:
Solenoid valve for electronic control via my Mash Monitor software
Ball valve for manual control
Steam inlet via 1/2" tee fitting - coupler will be welded to keg
Gauge stack:
At the top - a pressure sensor for use with the software
Middle - easy to read pressure gauge
Bottom - a coil pipe to be filled with water in order to protect the gauge/sensor
Pressure relief valve (15 psi) for safety
Rube Goldberg would be so proud...