this post was submitted on 20 May 2025
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hmmm
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The furnace section or combustion chamber it's called. It's usually corrugated steel in these package utility boilers. Almost looks like culvert pipe, just not spiral.
There's a refractory throat to shape the flame at the burner end too.
Water boiling into steam takes the heat away. It's flooded full of water on the other side, like a pot on a stove.