Griffs Services PowerWash
All 8 gpm
The reason I asked is because, in my experiences if the gum is dried and baked in I found it was removed faster when I cut the flow to about 6 gpm (using a smaller tip, this would work with my setup because I use a trapped pressure unloader) and have the thermostat to 205F to 220F (if it ever reaches that, I would say yes because this is the only time my burner would cut in and out, with full 8 gpm my burner never cuts off with ~60F inlet, I run 140psi 3.5 B tip in the 20" burner which is ~ 4.14gph diesel)
With 6 gpm I still have significant impact and ~ 200 F at the end of the hose. (remember the pressure losses with hose)
I use a 25 deg tip and 200ft of 1/2" hose.
But with gum that has some moisture content to it I use the full flow 8 gpm 25 deg tip, the thermostat stays in the same position but I dont believe it ever reaches the set temp, burner runs without cut off, hose is not as hot to the touch