To solve a problem that combustion gas is not effectively used and that there is no methods except a method of storing heat of combustion gas at most around a grate or heating only outer circumference of a cooking apparatus and that combustion gas is dissipated in a room and heat is wasted without fully utilizing combustion heat in heating cooking by a former gas heater.

Circumference of an outside of the cooking apparatus for heating and circumference of a gas heater are surrounded with combining a heat storage intermediate tube and a heat insulating outer tube to prevent radiation of combustion gas to the surrounding. Heat of combustion gas is stored in a heat storage inner tube and the heat storage intermediate tube at an outside of the cooking apparatus for heating, and the cooking apparatus for heating is made heated from the outside. Consequently, combustion energy of gas is effectively used.

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