What makes a machine "commercial?"

I think I have this sort of figured out already but need some confirmation if someone would kindly oblige.

So, there are a number of great "commercial" espresso machines on the market at/around the $2,000 mark. I'm looking for a machine that is portable enough to be used at a Farmers Market. Legally though (in terms of insurance)

Are machines like the Vibiemme and  the Expobar Brewtus III R actually commercial? I think the answer is no, largely because they don't have NSF approval.

What makes a  machine commercial and suitable for use in a commercial environment? Is it simply whether it has NSF approval? Can I use a machine like one of the two above that doesn't have this approval?

Thanks,
Paul



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