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I presonally don't like vent free units in that they deplete the availiable O2 and they leave large amount of moisture in the air.
I personally have install numerous self venting units (in stick homes) that vent to the outside and use outside air for combustion. All the units I have install will operate with or without a blower. I'm not sure why they don't use them in RV's, they vent to the outside wall and take up no more room than the elctric units. Weight might be the reason in that they are some what heavier than the electric units.
They would be great for dry camping and you can get them in very small BTUs, some as low as 8,000 BTUs.
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