Natural gas to Propane change over help
^^One key to the OP is whether he can still get those parts^^
"A story from the old days."
When I worked for a local Lennox dealer, we put equipment in two houses which were "going to have" nat. gas. So they put in LPG temporarily, and we ordered the equipment for LP and and also went out to see about the appliances the OWNER had bought, which were Sears gas range and dryer.
I had one HELL of a time with Sears over the years. I HATED dealing with those a-holes
1....When you call their 800 parts line, you never knew if you were going to have a 1 minute wait or a 1 hour wait. "I'm betting on" a 1 hour wait
2....One time, some woman answered, and told me "I can't help you my computer is down YOU WILL HAVE TO CALL BACK" WTF did you answer your phone then!!!!????
3....In the case above, they wanted my gas license number (then issued locally by then Washington Water Power, later Avista) AND THEY TOLD ME IT was not a legit number!!!!
All in all a gigantic waste of time.
ODDITIES: (At least back then)
When you buy a (then) typical water heater, you order it for nat. gas or LP BUT IT CAN NOT BE CONVERTED
When you buy a gas range IT COMES WITH ALL THE PARTS to convert, typically the burner orifices are screwed into a little "storage" bracket along with the regulator spring. Sometimes, you simply turn the regulator cover plug/ screw/ adjuster "over" and this is longer on one end or t'other causing more/ less spring pressure
Furnaces generally you order a conversion kit, but after a couple of years "no bets" on whether you could still actually obtain one!!!