We estimate that this cast-iron boiler catalog from The Peerless Heater Company in Boyertown, PA is from the 1980s or 1990s.
Steam-Boiler Water Feeder Patent (1879)
William C. Wolfe's circa-1879 patent for a water feeder shows an invention that is remarkable simple and fully automatic. It's probably one of the earliest feeders to appear in the world of steam heating. The patent explains how it works.
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