Mike,
Welcome to
www.powerwashnetwork.com
If you are referring to a Karcher K2400H they rate the unit at
2.5 GPM @ 2400 PSI.
A little underpowered for commercial cleaning, (In my opinion)
I guess you could do decks, or cars with it.
(It migh be a little slow going with only 2.5 gpm though.)
Most contract cleaners are running 4-8 GPM and 3000 to 4000 PSI.
I am sure you will get a few more opinions here, many have started
with small units also.
[hand]