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** Boiler and furnace live inside the boot, with a hinged grille on the heel providing access to the furnace. | ** Boiler and furnace live inside the boot, with a hinged grille on the heel providing access to the furnace. | ||
** Furnace fuelled by hexamine tablet | ** Furnace fuelled by hexamine tablet | ||
** Furnace and boiler made of two tin cans brazed together | ** Furnace and boiler made of two tin cans brazed together. | ||
** If possible, enclose assembly in a slightly larger can with rockwool nested between the two to protect the boot from the heat. If there's no room for a larger can, just stuff the boot with rockwool. | ** If possible, enclose assembly in a slightly larger can with rockwool nested between the two to protect the boot from the heat. If there's no room for a larger can, just stuff the boot with rockwool. | ||