No mention above of the catalytic heaters such as the portable Super Sur, which used to be popular as space heaters. My own experience of them was limited to a miniature version that I plumbed in to keep a motorcaravan warm. The more common type, for house use, had a cabinet housing both the heating element and a gas bottle (propane, I believe). I don't know if, like halogen heaters, they switched off automatically if the cabinet was knocked over.
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