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Q&A Hot water system as a heater for car camping?

For car camping near the snow line, is there anything that can safely be used as a heater while sleeping? For example, how large would ordinary hot water bottles need to be, to comfortably emit he...

4 answers  ·  posted 6y ago by benjimin‭  ·  last activity 6y ago by System‭

Question car-camping improvised-gear cold-weather