[Shop-talk] pressure washers

[Randall]

> Look closely
> at the GPM rate of the pump in addition to pressure.  It takes both to
> clean off built up gunk.

Just curious ... in looking at the referenced DeWalt model; I note that the
specifications never say "psi at gpm" but rather quote "maximum" psi and
"maximum" gpm without giving conditions for either.  I know from experience
that my puny little pressure washer (rated 2 gpm @ 2100 psi) will flow much
more water at lower pressure (open up the nozzle) and likely would produce
even more pressure at lower flow (if I were to screw down the unloader
valve).  It also seems odd that the DeWalt quotes less than twice the
horsepower, but almost 4 times the gpm times psi.

Do those ratings actually mean something, or are they like air compressor
"hp"?

Randall