This is a Mash Lauter Tun (MLT) made by Criveller Company rated at 15bbl complete with the false bottom. It is not heated, and historically was used just as a lauter tun with a mash mixer (also for sale). It comes complete with a dual spray ball for CIP.

More photos are available and I would be happy to hop on a call or video call to discuss the unit further and provide more information. Thanks!