The real inconvience is with propane heat you'll be scrapping the inside of your windows everyday...you'll have the cleanest windows in town...
With the Big Buddys....you should use a filter....or the lines will become clogged with oil from the propane...
The oil seems to come from the hose, and not the propane. Mr. Heat sells a hose that doesn't create the oil problem, so you can dispense with the filter.