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  • What is the gas pressure for Natural Gas?

     ares updated 2 years, 9 months ago 1 Member · 8 Posts
  • guest

    April 24, 2015 at 12:00 am
    I asked a questions yesterday.. thank you for the quick response, but I made a typo.
    The APW unit i am working with currently runs on Natural Gas. What gas pressure am I suppose to have for this Nat. Gas unit?
  • techjoeb

    April 24, 2015 at 11:18 am

    For most NAT gas units for APW it should be 3.5-5 inches of water column. Most of these specs are on the data plate or in the installation manuals. I hope this helps! 

  • wmontg5988

    April 29, 2015 at 9:25 am

    Typically Natural gas pressure is between 6 and 7 inches WC (water Column) some equipment will be lower or higher depending on consumption design. Of course a model plate on the equipment or data plate on the gas valve will list the proper WC. Some ovens or furnaces may be 3.5″WC and tankless water heaters can be as high as 11″WC. Be sure to check pressures on both sides of the regulator and/or gas valve to ensure the both are able to keep up with demand.

  • justrefr

    May 27, 2015 at 10:27 pm

    Your actual gas pressure will be approx. 2.5psi, the water colum pressure is 5 in w/c. pressures for all appliances are denoted in w/c and not psi. This can be adjusted at the gas valve of the appliance with a w/c guage connected to the manifold access tap. Hope this helps

  • ectofix

    May 28, 2015 at 10:31 am

    I'm sorry, but…WHERE does 2.5 psi come from?  It is NOT 5″ WC.  Maybe that was a typo?  2.5 psi is over 69″ WC and way higher than any gas pressure we work with for cooking equipment.


    Alright, this is some pretty basic stuff, but I'll throw it up here for clarification for anyone needing it:


    ONE pound per square inch of pressure is equal to 27.68 inches of water column.  The picture below rounds that up to 27.75″ WC since it's easier to remember:


    Valve chart.png

    techjoeb and wmontg5988 are correct in their statements regarding how to determine your correct gas pressures.



    CREDIT to PartsTOWN for the outstanding photos they provide in their PartSPIN feature.  I did some graphical editing to them to create my photos above.

  • rbnkitchenworld

    July 20, 2015 at 12:50 pm

    hi, let's not forget about and might want to consider elevation referencing to sea level…

  • mr-d

    July 22, 2015 at 5:31 am

    Gas pressure at different altitudes does not change, orifice sizing compensate for that.

  • ares

    December 13, 2018 at 6:48 pm

    2.5 psi? Huh? Run

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