| 摘要 |
PROBLEM TO BE SOLVED: To dissolve the nonconformity that the cover is not closed completely by energization force, of a conventional heater which is provided with an energization means such as a spring, etc., at the hinge part attaching a cover rotatably to the heater freely of opening and closing and which energizes the cover in the direction of opening, since if one cover to cover the heater at large is provided, the cover becomes too heavy. SOLUTION: A continuous projection surrounding one burner is made at the topside of a roof, and a plate-shaped cover to be settled within an extent surrounded by the projection can be freely removalbly mounted in the roof.
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