Self-heating container

A self-heating container comprising:

• a casing fixed to said container,
• a heater contained in said casing and including a pyrogen and a firing agent in contact with said pyrogen,
• said pyrogen comprising a mixture of at least one kind of metal oxide powder and at least one kind of powder of elementary substance or an alloy of metal and semimetal,
• said firing agent being easier to fire than said pyrogen, and comprising a mixture of at least one kind of metal oxide powder and at least one kind of powder of elementary substance or alloy of metal and semimetal, and
• a heat insulator contained in said casing under said pyrogen and insulating said heater from said container,
• said insulator having a bore formed therethrough and extending between said firing agent and the outside of said container to receive at least part of an igniter, and said container comprising a cylindrical peripheral wall, wherein said casing is cylindrical and includes an upper portion surrounding said pyrogen and said firing agent and a lower portion surrounding said insulator, said first portion being substantially smaller in diameter than said second portion, said second portion being slightly smaller in diameter than said peripheral wall.