Weber sells conversion kits. Basically, you need a new regulator and manifold to accommodate LP instead of the existing regulator/manifold setup for natural gas. Unfortunately, Weber does not sell their parts online. Their parts phone # is: 877-731-8081
Weber no longer offers or support conversion kits. If you do any conversion it will VOID you warranty!
That said, if you can find the parts online for the LP version of your grill you can convert it yourself if you are mechanically inclined.
You will need to change the JETS and the GAS REGULATOR. Unfortunately they do not sell official Weber Gas Jets alone. You will have to buy the complete LP Manifold, valves and all as well as the Regulator...
Make sure you are comfortable with all of this... Leak testing etc...
You may have luck finding parts at:
http://www.ereplacementparts.com
It looks like you can get either the propane version for around $400 in black, or the natural gas version in stainless steel for $469. Their more expensive grills like the Genesis E310 comes in both fuel types - but typically the natural gas version runs about $20 or $30 more.
Congratulations on wining the grill! However, Weber makes this model in both Natural Gas & Propane, but they can not be converted from one gas type to another. There is no conversion kit available (please see Owners Manual link below). If the grill is unassembled and still in the box, you could always sell it on Ebay or Craig's List and make enough to buy a new propane model. Or you could try trading it for a propane model, with a Weber dealer.
http://help.weber.com/manuals/pdf_files_2011/Gas/Spirit%20ES%20Series%202007newer/OwnersGuides/Spirit_210310_NG_OwnersGuide_89961_022811.pdf
Wish I had better news for you, but it is what it is.
In reference to Solution 1. Please see the Frequently Asked Questions section on the Weber Grill website. Copy & paste the link into your web browser. I point this out for safety sake, as former Weber dealer. http://help.weber.com/faqs.aspx#Charcoal...
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