My sister bought one of these to use in the back of her pickup with a camper
shell.  During the first two hours she used it she got an overpower burnt
metallic smell that gave her a headache.  Hoping that the smell would only last
a few minutes, she had all the windows open to air it out while it was on --
defeating the purpose of the heater completely.  She ended up turning it off
after two hours of this overpowering smell and returned the item to the store.
  I strongly recommend to any one who buys one of these to set it up in a well
ventilated area outside during the first use and give it a good burn in period.
You can also use this burn in period to access for yourself if you are sensitive
to any of its operation.  By the way, I think the instructions say not to use
this heater while you sleep--probably for fire safety sake but who knows what
else they may also be worried about.

Vince.
85' Westy
(Still have not installed the Aux. Bat. and Poropex Heater)