O-E Vapor System Manual
This manual was created by O-E Specialty Manufacturing Co. and outlines how to install the "O-E" Perfect System, which is a Vapor Vacuum heating system.
How to Lock Out Air: The Heat Thief
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.
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