Val... we have the Dickerson fully vented propane fireplace (Newport) - there is no concern about wetness, combustion air is drawn down a dual tube stack, and the products of combustion are fully vented as well. The deck fitting is very compact and should prove no real obstruction to your sightlines. It has a fan to blow the heated air and has a nice ambience as it is really a fireplace, you can see the flame through the window in the door.
West Marine, Steveston here in Vancouver, all carry these models - clean, non smelling, it works great. They have a 9000 btu (ours) and a larger 12000 btu model.
Check it out before you resign yourself to a potentially smelly diesel heater.