I have a 2.2 gpm with 3/8" hose and I have a 7 GPM with 1/2" hose. If you are doing large driveways the 2.2 with a 3/8" will be annoyingly slow sooner than later. I have never tried the 2.2 with a larger hose that might make it flow enough. I had a 5.5 and it would be plenty for what you want to do. The 7 would be overkill.
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