Boiler ratings and efficiencies
Subtitle: as of May 1, 1981 : I=B=R ratings for cast iron boilers : SBI ratings for steel boilers : AFUE, annual fuel utilization efficiencies.  U.S. Dept. of Energy.
Publisher: The Hydronics Institute
Published: 1981
Place of publication: Berkeley Heights, N.J
Language: eng
Number of pages: 104
Subjects: Boilers -- Standards.
Other titles: I=B=R ratings for cast iron boilers.; AFUE, Annual fuel utilization efficiencies. U. S. Dept. of Energy.; SBI ratings for steel boilers.
Notes: Cover title.

Chiefly tables.

Addendum #1 (April 1, 1982) inserted.