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Posted by Heatpro on January 18, 2006 at 17:25:01:
In Reply to: Efficiency of HB SMith SOB-S7 model posted by Visitor0118 on January 18, 2006 at 16:34:07:
The Department of Energy issued the boiler efficiency testing procedure in 1978.
http://www.newbuildings.org/downloads/guidelines/BoilerGuideline.pdf