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boiler 
Device in which water is heated before being distributed to the radiators.
aquastat
Device regulating the water temperature.
pressure relief valve
Mechanism for releasing pressure by letting off excess water or steam.
box
Rigid metal casing for the boiler.
chimney
Channel through which combustion gases are evacuated.
burner
Device for mixing a flammable substance with air, and fanning and igniting this mixture in a boiler’s fire pot.
