I'd suggest the 8gpm machine, if you don't need hot water just turn off the burner. More water volume will allow you to work much faster, expecially with heat.
Almost all of my machines are high volume units and I generally run them with small tanks.
I have a 6gpm cold water unit mounted in a van with a 30 gallon float tank.
A 5.5 gpm hot water unit with a 225 gallon tank on a trailer.
A 8gpm black knight hot water pressure washer with a 200 gallon float tank
and a 12 gpm hot water unit with a 200 gallon float tank.
In a couple of months I'm going to mount my 8 and 12 on a new trailer with a 325 gallon float tank for some commercial jobs I'm doing. I'll tow it with a ford350 pickup truck I just got that has an 8gpm unit in the back. I'll be able to run 3 high volume lines or 6 lines from the one rig.
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