On 01/04/2012 15:28, Hugo Nebula wrote:

Am I missing something here? Is pressure a function of the flow rate,
and if so, what's the point of a pressure washer if it gives less than
mains pressure?

There's certainly no need for them to shift vast volumes of water to be
effective. I think the point is that they generate (or should do) a very
high pressure by pumping water through a very small orifice. Certainly
my Karcher blasts out a very effective jet, but the actual flow rate is
way less than provided by a mains-fed tap.

David