True, but that force, or pressure is what counts, not the pressure inside
the hose. As you move the nozzle closer and farther from the target, the
force is going to change. Even though the figure is given in psi, the hole
in the nozzle is very small too, not an inch. Just as light falls off as
you move to increase the distance between the light source and target.
They are independent.
PSI = Cleaning power as it dictates the water velocity and thus cleaning
GPM = Cleaning efficiency as it dictates the volume of high pressure
water and therefore the area that the cleaning force can be applied to.
The smaller the area, the longer it will take to clean a given surface
area, just like a 22" lawn mower vs. a 60".
Well, that ain't exactly the whole story either...
The nozzle tip geometry has a great deal to do w/ the actual application
of the water to the surface and the effect thereon for whatever the
actual PSI/GPM ratings are...
Another way of looking at these two washers is to make a more
common electrical comparison. This comparison difference will hold
true in pressure washers also.
2gpm @2000 psi would be represented by 2amps @2000 volts
4gpm @4000 psi would be represented by 4 amps @4000 volts
Power = Voltage x Amperage So........
The 2gpm washer equals 4000 units of cleaning power
The 4gpm washer equals 16000 units of cleaning power
* units of cleaning power undefined
* units of cleaning power are for reference/comparison only
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