We estimate that this cast-iron boiler catalog from The Peerless Heater Company in Boyertown, PA is from the 1980s or 1990s.
Table of Estimated Radiation
Written by Harry B. Perrigo in 1913, these four pages of simplified sizing information for heating systems must have been in the pockets of many a Dead Man over the years. Thanks to Gus Stants for sharing it with us.
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