Like Pual said, you can go with a larger spec'ed Pwer, though what you have is perfect in my opinion unless all you seem to do is concrete. For the likes of most, 5.5 GPM allows for nice flow, but you don't have to worry about having to be tank feed as you COULD run right off of a hosebib. (Most buildings are stepped down to 6 to 7 GPM). Plus a littler surface cleaner is easier to store; takes less time for the bar tip to spin the next pass; and less water usage is good for all. Keep tips in good shape and clogged free, and the smaller spinner can be a great workhorse. if I can be of service in any way, give me a call.