Pressure washer for the shop? Anyone?

Discussion in 'Power Washing' started by FinerCutslawnCare, Jan 13, 2011.

  1. Pumptecguy

    Pumptecguy Inactive
    Posts: 71

    You are correct that you can turn it down, but in doing so, you DECREASE the gpm (flow), and therefore, the cleaning power of your washer.

    The nozzle creates the pressure, the pump pumps a set amount fo fluid, the engine drives a the pump at a speed. The law of nozzles requires a fixed amount of fluid for a specific pressure. For example, an '04 nozzle performs as follows: 1 gpm at 250 psi, 2 gpm at 1000 psi, and 4 gpm at 4000 psi. None of these are a good choice for what you want to clean.

    If you really want to clean something, then I recommend a washer that has the ratio of gpm to psi of 1:350. This is roughly what self serve car washes have. They operate at 3.5 to 4 gpm and 1000-1200 psi.

    If you want to spend a lot of money and have a very limited use (useless?) washer, then buy a 4 at 4000. If you want to have something that will clean very well, then increase your gpm and lower your pressure. The practical limit for flow is about 5 gpm, since most garden hoses cannot keep up. A 5 at 2000 or 2500 psi would a wiser choice IMO.

    If you still want the 4 at 4000, then use a dual lance with either an '05 (2500 psi) or an '06 (1800 psi) in the other side. You will probably like the cleaning ability so much that you will wonder why did I spend extra for '4000'.
     
  2. FinerCutslawnCare

    FinerCutslawnCare LawnSite Bronze Member
    Posts: 1,385

  3. gasracer

    gasracer LawnSite Bronze Member
    Posts: 1,049

  4. bcg717

    bcg717 LawnSite Member
    Posts: 16

  5. gasracer

    gasracer LawnSite Bronze Member
    Posts: 1,049

    The ones I posted are from a shop near me but they sale and ship things all over the world.
     
  6. Keegan

    Keegan LawnSite Senior Member
    from CT
    Posts: 605

    Simpson and Graco make VERY GOOD washers. The higher the gpm the better it will clean. Don't just look at the psi.
     
  7. FinerCutslawnCare

    FinerCutslawnCare LawnSite Bronze Member
    Posts: 1,385

    I looked at these 2 sites. Has anyone had any experiance with hotsy? I have used an electric M-I-TM and wow it was a brute!
     
  8. bcg717

    bcg717 LawnSite Member
    Posts: 16


    Hotsy is one of the top of the line brands, as well as Mi-T-M, Landa, Hydrotek, Alkota, Alladin, etc.
     
  9. FCPWLLC

    FCPWLLC LawnSite Senior Member
    Posts: 352

    No and No. Direct drive and cat pumps are expensive to fix. Good pump, just to a good bang for your buck.

    For what you want to do.....

    http://www.pressuretek.com/bedr4gpm40ps.html

    I personally won't use anything less than 8gpm anymore now that I have used almost everything out there. You asked about the Hotsy... Good machines but priced way higher than equally good machines.
     
  10. gasracer

    gasracer LawnSite Bronze Member
    Posts: 1,049

    Let's be realistic,I would like to know where you get a water supply that handles 8gpm?Not from a 3/4" water hose.
     

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