Packless radiator supply valves kept air from working its way into a vacuum system. This bulletin from C.A. Dunham Co. is from 1916 and features the Dunham Packless Inlet Valve. Thanks to David Cordes for sharing.
Here is the original Installation and Operating Instructions and Parts List for The H.B. Smith Company's Oil Fired Cast Iron Hot Water Boilers (No. OHB-13W). This is esti...
The Henry Ford Museum in Dearborn, MI has an interesting hot-water heating system. Take a look at the radiators below. They are from the Shaw-Perkins Manufacturing Compan...
We estimate that this cast-iron boiler catalog from The Peerless Heater Company in Boyertown, PA is from the 1980s or 1990s.