heating surface
noun1
In a steam boiler, the aggregate surface exposed to fire or to the heated products of combustion, especially of all the plates or sheets that are exposed to water on their opposite surfaces.
- [...] combined heating surface is 6,151 sq. ft. (tubes, 530 sq. ft., flues, 3,275 sq. ft., firebox, with arches and thermic syphons, 415 sq. ft., and superheater 1,931 sq. ft.); [...].1941 January, “Recent North American Locomotives”, in Railway Magazine, page 27:
- Synonyms
- fire surface