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** 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. | ||
*** For combined thermal, protective and flame-retardant properties, nomex racing socks might be ideal (and cheap) insulation. | |||
* Combine water inlet with close-fitted weighted cap as safety valve? | * Combine water inlet with close-fitted weighted cap as safety valve? |