We estimate that this cast-iron boiler catalog from The Peerless Heater Company in Boyertown, PA is from the 1980s or 1990s.
SelecTemp Modulating Zone Heating
Turbonics offered this unusual steam system, which Iron Fireman had come up with years before. It was called SelecTemp and offered self-modulating zone heating. Thanks to Gerry Gill for finding and sharing the document on The Wall, and to Frank "Steamhead" Wilsey for bringing it up again years later.
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