Here is a wonderful little book from Hoffman Specialty from 1927 called How To Lock Out Air: The Heat Thief. It includes some great pictures. It makes the case for steam heating systems, shares how a one-pipe steam heating system operates, how to vacuumize a one-pipe steam heating system, why Hoffman No. 2 vacuum valves save one-third of your fuel, how Hoffman No. 2 vacuum valves pay for themselves in less than 2 years, as well as some customer testimonials. Special thanks to Alex Marx for doing the scan.
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.