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Here is the patent for an interesting piping system, offered by the Murrays, father and son. Gerry Gill, who found and shares this with us, comments, "This patent lists b...

This article is from Combustion magazine in January 1930. These boilers heated many a New Yorker.

Here's a playful article from The Craftsman magazine (May 1914), published during a time when vapor/vacuum heating was just coming into its own. One of the huge advantage...

The Norwall Manufacturing Company made a variety of products for vacuum steam heating systems. This document about their automatic air valves is from 1906.

The Nuvacuumette Vapor Heating System was developed in England around 1905. This simple vapor system circulated steam at temperatures between 180-200 degrees F, while doi...

The O-E Perfect System was a Turn-of-the-Century vapor heating system, simply described and pictured in this document. Thanks to Alex Marx for scanning this one for us, a...

In this 1933 Fuel Oil Journal article, O.O. Oaks, Chief Engineer for the American Radiator Company, explains the effect automatic firing has on a steam system that was pi...

Published in June 1949, this work was was done at the University of Illinois Urbana, where the Institute of Boiler and Radiation Manufacturers once did all of their resea...

The Richardson System of vapor heating was popular in the 1910s and 1920s. It's very simple, and you must run it at very low pressure (less than 1 psig) on a vaporstat. T...

The return trap is like a mechanical condensate pump. This 1943 piece about Sarco Alternating Receivers and Lift Traps from the Sarco Company does a nice job of explainin...