Paul,
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Yes, the typical holiday caravan uses LPG for cooking, hot water, and heating.
Gas heating in a caravan?. [Linked Image]
That sounds rather dangerous, I'm merely thinking about the chances of a person being asphyxiated in such a small "room", should they go to bed with the heater still running.
Mind you, it wouldn't be any more dangerous than cooking with it (gas) I suppose.