The tank is insulated and made out of stainless steel. It came out of the dairy industry.
Just to note, it has some pitting along the weld that attaches the top wall/brim to the tank (Shown in photos).

It also has a built on agitator.

Voltage: 240V

Capacity: Approx 2000L

Internal Dimensions (mm): 2300 x 1500 x 600
Overall Dimensions (mm): 2580 x 1750 x 1780