Last winter I bought a little = coleman heater that is fueled by the little bottles of propane(the screw on = kind.
While it does not put out enough = heat to heat the cavernous interior of the westy, it is great for warming body = parts.  A rule of cold weather camping states that if your feet are cold when you = get in your bag, they will remain cold.  This heater is perfect for = heating your pigs so they stay toasty in your bag.  The instructions say this = heater can be used IN a tent ie no fumes.  I have always distrusted this and = never run it while sleeping in the westy.  Tents are more breathable = than(most) top-down westies anyway.
In the last week, this heater has = saved me twice. Last night it kept the temp tolerable when it was -5 out and I = broke down.
3 days ago, my gsa cap was froze. Key would not = insert.  Station had no "unfreeze" solution.  Not enough in the = tank to drive on home.  The heater saved the day-used it outside in this case.  Well worth the
...still $45 at Walmart.