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How to Lock Out Air: The Heat Thief

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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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