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Now that is cool (no pun intended). It suggests multiple additional possibilities as well. If a fireplace or stove was not available, or it would be unwise to create the smoke to use one, a passive radiator system could use this same concept to heat a small room in a house so at least one area was well above the outside air temperature. This could be expanded to a number of potential uses. Thanks for sharing that video Malgus.

"Ye hear of wars in far countries, and you say that there will soon be great wars in far countries, but ye know not the hearts of men in your own land."