Be prepared to have lower BTU output with Nat Gas, if you are hooking up to a preexisting home Nat Gas outlet I don't believe a regulator is necessary as it's already regulated to 8" WC, but check with your local gas supplier.
WC stand for Water Column, basically it is a way to measure pressure that is less than 1psi, all household gas appliances wether it be LP or Nat Gas are regulated to 11WC, LP or 8"WC for Nat Gas.
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