Most don't come with any supply hose or electrical cord.

Some of the 800's (the ones made in Germany) come with an electrical supply cord and box for you to plug in, but no hose. I could be wrong on the hose though with those German models.

The reg. 800's made in NC definitely do not come with hookups.

A braided stainless line is generally considered the best type, but there is nothing wrong with a copper or PEX one. They all have advantages and disadvantages. DOn't get a stainless one with a leak protection feature.