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Boiler Heating Xfer Area

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MikeSpeed6030
MikeSpeed6030 Member Posts: 69
Many moons ago, it was thought important to list on the nameplate the heat transfer area of a heating boiler, sq ft. (Mine is 41 sq ft.) A figure of merit for boilers was the heat transfer area per Mbtu/hr input. A larger ratio was considered better, i.e., a physically larger boiler. (This was in addition to the rated heat input, Btu/hr, and net output, both also listed on the nameplate.)

Nowadays, we don't hear about this. Why?