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Converting natural gas to propane.

hublake Member Posts: 1
I have an older model Lennox wall furnace, Model #GT3-35W-DM. Currently this is equipped for natural gas. Can this be converted to propane by changing the orfice or not. If not what would I have to do to change it.


  • Bob Bona_4
    Bob Bona_4 Member Posts: 2,083
    You may want to contact your local Lennox dealer for parts availability. They may or may not sell to you. Lennox has a protected, often proprietary parts system.
  • Tim McElwain
    Tim McElwain Member Posts: 4,628
    I would suggest contacting Lennox and have them send you a kit, that way it gets done right. The burner orifices will have to be sized and changed, along with the pilot orifice and the gas valve or regulator will have to have the spring and cap changed. Then a combustion analysis will need to be done. Most important make sure the unit is allowed to be converted some equipment is not authorized to be converted by the manufacturer.