1. The basket is about 26 inch, Dia. X 36 inch the height
2. Yes, it has his own heating elements, you need for it 380 V 3 phase. I preferred external steam, I used a steam boiler, it works quicker than the elements.
3. Cold water 3/4 inch, you need an air compressor, to maintain counter pressure, if you use plastic containers. But if you use cans or glass, maybe you don't need, anyway do you need an air compressor for the automatic valves, unless you want operate manually. And line for the waste water.