It is indispensable to install a suitable pipe union in the pipeline, in proximity to the burner, to allow for easy disassembly of the burner and opening of the boilerdoor.
为了便于燃烧器拆卸和打开锅炉门，在接近燃烧器的管子的地方装上合适的活接是必不可少的。
3
Then I lay there, listening to the boiler roar, and feeling the cool air on my face as it came through the half-open kitchen door, and the warm water on my body.