The operation of a heater with poor ventilation; 3.The operation of a heater with good ventilation and air flue being partially blocked; 4 The operation of heater with poor vetilation and air flue partially blocked.

• 模拟工况有以下几种：厨房空气流通情况下热水器正常使用；厨房空气不流通情况下使用热水器；厨房空气流通情况下，热水器烟道部分堵塞；厨房空气不流通情况下，热水器烟道部分堵塞。