Fire. In a barrel. With a handle.
Not much else to say about this absolutely genius tube of hell and beauty. In it, you place your hot as fuck coals, charcoal or burning pieces of wood. Grab it by the handle and carry it to where you need it, use it to smoke things out on top of it, or use a trebuchet to launch it over the enemy walls to signal your impending conquest.
Made of wood, steel and the influence of the ancient gods of fire. Do yourself a favour. Buy this. If not to create the warm hearth of life, then to vanquish the languishing cold heart.