You know there are trade offs for using the buddy heaters vs the installed propane furnace.? The buddy heaters are quiet and more efficient since they vent indoors.? But one by product of combustion is water, so using a buddy heater will result in a lot more water condensing on the metal or glass inside the trailer.? Plus the other by product is CO, and they do say not to use the buddy heaters while sleeping.? So be aware of that if you decide to go the buddy heater route.
I find the recommendation to use the filter for the buddy heater a bit bizarre.? So you have contaminants in your propane flow and need a filter to remove them.? But no other propane appliance has any recommendation for a filter.? So you'll just let all the other propane appliances malfunction if the propane is contaminated?
The main contaminant is supposedly oil in the gas.? This does happen, and it's happened to me.? I replaced the propane regulator at one point, and laid the disconnected propane line on the ground.? About a tablespoon of heavy oil slowly leaked out of the hose.? When the hose is connected up, theres a low spot in it between the tank and the place it's fastened to the frame, and the oil had collected in that spot.? So now what I do as part of my annual maintenance is to disconnect the propane line and lay it on the ground overnight.? So far i haven't seen oil in the hose a second time.
Just my opinion, but I think you're better off disconnecting your propane line to check for oil than getting a filter.
