Can the UDXC-30 be converted to propane?

Hello, thank you for reaching out. Yes, the Reznor UDXC-30 can be converted from natural gas to liquid propane (LP) using a manufacturer-approved conversion kit that you can buy separately if you would like (SKU 1043184R). Or we also have the UDXC-30 unit with its propane conversion kit included here (you may need to copy and paste this link into the browser of your choice): https://hvacdirect.com/reznor-udxc-30-000-btu-low-static-axial-fan-convertible-propane-fired-unit-heater-replaces-udx30-udz30-udxc-30-1043184r.html .If you have additional questions, please feel free to reach out over the phone to our Customer Service line at 1-888-901-5460. Have a great rest of your day.