because a unit can have alot of psi but no output, so both are important.
Without looking, I forgot what gpm my unit is. I use if for contractor purposes, I may spray clean a home, or metal building, or striping a deck, or to wash my truck.
Bigger horse power engines go hand in hand with more gpm and the capacity to push more water.
Remember, more washers go south due to faulty engines, just like ginny's do with electricity.
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