| 摘要 |
PROBLEM TO BE SOLVED: To supply combustion air for excellent combustion stably without the need of individual control of revolutions of a combustion fan for supplying combustion air to a burner section in the case where a hot water heater unit is adapted by arranging and containing a plurality of general purpose hot water heaters used for a bone in a large sized easing in response to a necessary hot water heating capacity. SOLUTION: A front surface door 5 comprises a front surface plate 51 having an air intake hole, and a rainproof plate 52 fixedly mounting on the back surface of the foregoing front surface plate such that it communicates with the foregoing air intake hole and a plurality of air passages 52a communicated with the foregoing air intake hole and isolated from each other between it and the foregoing front surface plate corresponding to the number of contained hot water heaters 2. A partitioning sealing section is provided to the back surfaces of the front surface plate and the rainproof plate and at a position located at a boundary of the hot water heater such that when the front surface door is mounted on a large casing 11, sucked air through the air passages is supplied to the hot water heater respectively independently.
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