I bought an older home that has an old Sigler 100,000 BTU, forced-air propane furnace. It has a standing pilot but does have a metal flue to vent it so I'm not sure if it's a natural draft or an 80+, I'd suspect it's natural draft. (We primarily heat with wood, but the furnace has worked well when we've run it.) Given how epensive propane is in our region, I'm considering replacing the old Camstat thermostat (model T18H200) with a programmable, digital thermostat. I'm not sure whether the Camstat thermostat is a furnace fan limit control, again the numbers that show on the face of the thermostat, once you remove the front cover is T18H200. If this is a fan limit control model, are there programable thermostats that I can purchase and install? TIA

They work well, inexpensive, Relatively easy to install. Write down colors or take picture
before dissassembly. Digital readout makes it easy to precicely adjust.
If it is only wires at thermostat(no thermocouple or anything), it should work fine.