A while ago I mentioned a heater that I was thinking of installing. It is
available fro JC Whitney as well as Canadian Tire: Here's the scoop:

electrical - 12V
crystal energy cell
300watts/1200BTUs
102CFM
draws 25 amps
fan and heater

Q: will this be at all sufficient to add extra heat to the van and is
25amps an overwhelming drain on the battery?

TIA -DC -- 

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David Carment
School of International Affairs
Carleton University
Ottawa, Ontario
K1S 5B6
voice - (613) 788-2600-6662
fax - (613) 788-2889
Email address: dcarment@ccs.carleton.ca
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