Our off grid house has limited solar in the winter. I would rather not run a generator to run a furnace. We have a wood stove that will carry a lot of the bulk of the heating demand but I am older now and weary of feeding the beast 24/7. I have been thinking of a non-electric VENTED propane heater of some kind. Williams has some wall furnaces, Jotul and a number of other companies make some nice looking "gas stoves". At my folks camp they have a floor heater that has always kicked ass. Yet all of the non electric options look pretty inefficient compared to electric operated heaters like rinnai's and such. I doubt running a generator to get the extra efficiency on propane really makes sense. Anyone out there comment on what they are using and cost considerations for heaters not requiring power input?