I need to know how to change from natural gas to propane on a Rheem furnace model number rgla-100c-er could you please help me.

Hi NLS14me

Contact Rheem at

Gas Furnaces from Rheem (http://www.rheem.com/products/heating_and_cooling/gas_furnaces/)

See if they have PROPANE ORIFICES for your model furnace.

If they do, you should be able to swap out the natural gas orifices for the new propane ones pretty easily.

Be sure to check inside the furnace door/jacket as well as some manufacturers send the propane orifices with every natural gas furnace!

Mark

Not to sound mean. But If your asking how to convert a gas appliance You may not want to attempt it, and if you do-- use a manometer to set the gas pressure after you have replaced the burner orifice and gas valve regulator spring.