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  1. #1
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    Pressure vs Flow

    This question is about pressure washer for car wash in mind.
    What is more important when choosing pressure washer? Pressure or Flow Rate?

  2. #2
    Super Member Coatingsarecrack's Avatar
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    Re: Pressure vs Flow

    A mix of both. If had to choose one just for car washing GPM. Multi use around house PSI.


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  3. #3
    Junior Member North1Star's Avatar
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    Re: Pressure vs Flow

    The question should be what is the the flow rate and pressure range that you need for your use

    Each type of use has its different flow rate and needed pressure

  4. #4
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    Re: Pressure vs Flow

    Quote Originally Posted by North1Star View Post
    The question should be what is the the flow rate and pressure range that you need for your use

    Each type of use has its different flow rate and needed pressure
    Sole purpose is car washing as mentioned in the first post

  5. #5
    Super Member FUNX650's Avatar
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    Re: Pressure vs Flow

    IMO:
    Both can be considered important.

    However:
    I’ve found that when it comes to the
    rinsing stage of the overall car washing
    process, flow becomes “more” important.


    Bob
    "Be wary of the man who urges an action in which he himself incurs no risk."
    ~Joaquin de Setanti

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  7. #6
    Super Member PaulMys's Avatar
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    Re: Pressure vs Flow

    I agree with Bob.

    Even a "lesser" pressure washer will have around 1200 psi. That is more than enough to knock off loose dirt.

    It's when you go to rinse, or do a broader cleaning (think vinyl siding), that you want a higher flow rate.
    It is no coincidence that man's best friend cannot talk.

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  9. #7
    Super Member joleyred's Avatar
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    Re: Pressure vs Flow

    I have a 4500 lb engine driven pressure washer that has to have enough available GPM to even be able produce that much pressure. Anything over a couple hundred pounds is a lot of pressure if adequate flow rate is available. You should be able to supply at least 5 GPM to have good pressure.

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