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Thread: Conversion from propane to natural gas

  1. #1
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    Conversion from propane to natural gas

    I got a brand new Weber Genesis II S-310 Stainless propane grill for half price.

    I bought it thinking it should not be hard to convert to natural gas.

    I looked up the size of the drill bit required for making the orifices the correct size for around 12,000 btu on each burner using natural gas. Used number 53 drill bit. The grill is rated around 38,000 btu.

    Just hooked up the grill to test and it seems that the fire is too small.

    Are the valves different on propane grills versus natural gas grills?
    Genesis II S-310 Stainless - 26" Kettle Premium - Jumbo Joe Premium

  2. #2
    TVWBB Hall of Fame LMichaels's Avatar
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    This is not a job to be taken lightly. In some cases YES the valves are SLIGHTLY different and in others no they're not. Part of being successful is knowing which you have and how to do the mods PROPERLY. You cannot just go blindly on this. You can cause poor performance or worse HUGE safety issues plus know you have now voided the warranty so it is DOUBLY important you just don't go willy nilly doing something like this

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    I don't just do anything "willy nilly".
    I explained how I got here.

    I asked one simple question.

    Are the valves different on propane grills versus natural gas grills?

    Specifically on my Weber Genesis II.

    I would appreciate it if anyone who is knowledgeable about my question can answer it.
    Genesis II S-310 Stainless - 26" Kettle Premium - Jumbo Joe Premium

  4. #4
    TVWBB Pro Sam Bee's Avatar
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    Tommy, this thread might help you...

    https://tvwbb.com/showthread.php?770...er-to-Propane-!!!

    AFAIK the orifices on the NG are larger than the propane ones...I could be wrong though. LMichaels has a wealth of knowledge on gas conversions and he is the go to guy for this kind of stuff (and other stuff as well). I believe by modifying your manifold you have voided the warranty but I'm guessing that was a risk you were willing to take...? I do hope that thread helps you out though. Good luck!
    22" Kettle Premium | 26" Kettle Premium | '00-'01 Genesis Platinum C, 13 bar (Budweiser) | '05 Genesis Platinum C (open cart) | Q1200

  5. #5
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    Hey Tommy... could you please post your model number from the sticker on your Weber and post it here. I'll try and help you if you like, thanks

  6. #6
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    Here is the Chart to determine your orifices hole size... https://andersonforrester.com/conversion-chart/

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    Picture of Label

    Apparently I cannot post pictures.

    Info on label:

    Part number 61000001
    Serial number GN50883XX
    XX is for privacy reasons
    37500 BTU
    Gas pressure 11" WC
    Genesis II S-310 Stainless - 26" Kettle Premium - Jumbo Joe Premium

  8. #8
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    Thank you all for the help.
    Genesis II S-310 Stainless - 26" Kettle Premium - Jumbo Joe Premium

  9. #9
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    Quote Originally Posted by Kelvin in AB View Post
    Here is the Chart to determine your orifices hole size... https://andersonforrester.com/conversion-chart/
    Thank you for the chart link.

    That is the same chart which I used.
    #53 drill bit at pressure of 7 should yield ~12000 btu per burner. There are 3 burners, so 36000 btu is just under the rated 37,500 btu of the grill.
    Genesis II S-310 Stainless - 26" Kettle Premium - Jumbo Joe Premium

  10. #10
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    here is the Weber details...

    GENESIS II S-310 LP BLK (2018) (US/CA/MX) 61000001


    https://www.weber.com/US/en/help/sch...model=61000001
    Weber E 320 Genesis Black NG, then converted over to Propane.... right side controls

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