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Location: East sussex
Joined: Feb 2007
Posts: 2,843
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What pressure washer companies don't say
I have been digging a little deeper into claims for pressure washer PSI. Did you know, because I didn't, that the quoted pressure is pump pressure and not flow pressure.
If the pressure is claimed to be say for example 145psi on the Karcher K7 the actual flow pressure is more than likely to be around 120psi. Something manufactures do not tell you.
I did find one site that admitted the difference at least on a petrol pressure washer
link
https://barrowsandtrailers.co.uk/gb/...FYidGwodpGQBBQ
Bit of a difference between 3000psi and flow rate of 2700psi but as i said at least they have published it
The karcher K2 series flow rate is about 80 psi not the pump pressure of 110 psi
So why do they not quote flow rate pressure? I think this could depend strangely enough on the water input pressure- size and hose output length etc etc. Therefore not easy to give that quote, the only thing that is constant is pump pressure which is what they quote
I feel they should quote both pump pressure and an approx of flow pressure so buyers know what they are to expect.