Combustion — light and heat consuming what feeds it. Fire warms a hearth and takes a house, and it is the same fire.
Old English fyr (fire), from Proto-Germanic *for, from Proto-Indo-European *paewr-; the same combustion that warms a hearth and can take a house.
Combustion held in one place warms; the same combustion loose takes everything. The house asks always which one is meant.