I’ve searched and haven’t been able to find the exact answer I’m looking for. I have a 5.5/3500 machine and am looking to get a new surface cleaner. My old (ancient) cleaner has seen her last day. I can’t tell what the tips are in it, so I have no idea what PSI it was actually putting out. It worked great so I want to make sure I get similar PSI. I am thinking about just getting a 16” Whisper Wash so what tips should I have for concrete and paver work? I really have no idea what PSI I should be shooting for on the nozzle chart. Thinking 2500?? Does that sound right or should I go lower? Thanks!
There are other Ninjas of the Nozzle here but I will speak from my experience. I run a 20" SC on my 5.5 3500 machine… initially, I had 25025 however I tried 2503 and I like them a little better. I’m at around 2500 at the SC.
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Disclaimer: I’m only going off of the tip calculator, and have only been in business for myself a little over a year.
You can run a 19" WW Ultra and you’ll love it.
2 nozzles at 25035 would give you around 2300 psi, a little weak but pre and post will help.
2 nozzles at 2503 would give you 3240 psi (a little high, but 200’ of hose might bring you down to the sweet spot)
2,500- 2,800 has been great for resi…
I step up for commercial, Ill be in at 3,000- 3,200 and some heat
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Here’s the calculator, divide by how many nozzles you will use.
Yep the 5.5 usually just gets to watch on commercial jobs. 
I’m not commenting to make this a measuring d contest…
Just for reference for anyone looking to set up there SC… and I do small commercial work… It isn’t my thing
Well luckily we do mostly residential and we are part timers so I’m not concerned about commercial. Works out. We’ve built a 6 figure business doing house washes and roof cleaning.
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Oh yeah sorry wasn’t aiming that at you man - I started with a 3GPM from Northern Tool. I don’t do measuring contests because I usually lose. 
I use a 20inch surface cleaner with 2503.
Gives me 3000 psi at the end of 150ft hose ony 5.5 gpm cat pump.
For pool decks and painted areas, I use another SC with 2504, so no damage to paint.
