>passive gas heaters
Tell us more. I Googled the term and got just 1 hit (in French).
We have two propane heaters--no electricity, no natural gas lines.
Glow-Warm 18,000 BTU, Comfort Glow 15,000 BTU. Can be vented or
unvented. Ours are unvented since they're so small and low-power. Both
have a mechanical spark or pilot can be lit with a match. No fan needed,
but we have ceiling fans that blow upward in the winter [heating] and
downward in the summer [cooling]. http://www.comfortheaters.com/
http://www.gwheaters.com/
You could also use a wood, pellet or corn-burning stove without
electricity, a hurricane lantern, and a windup radio, cell phone
charger, laptop.
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