I have a 1500 Watt air space heater siiting on the floor of my Transporter.
It is connected to a power cord that makes it way out the front of the truck
at the lower grill, protruding about ten inches.
On evenings before exceptional cold mornings I plug it into a dedicated
extension cord which is connected to a timer which is set to come on about
twenty minutes before I leave for work.
It presents a very comfortable cabin when the outside even when the
temperature is below freezing.  During the last freezing rain storm I came
out just in time to see a big ice sheet sliding off the windshield. The wife
said it took her twenty minutes to ice-pick the Golf. I was quite pleased.
I just back out the driveway and the cord unplugs itself.
I have plans of also connectiong a small battery booster to the circuit.
When I get a round tuit.
Ken Lewis
http://neksiwel.20m.com/