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A big thanks to Mike Thies for scanning this rare article from Danfoss. There's a heavy emphasis on one-pipe water systems in this one. Great stuff.

This Designing Simplified for Taco Venturi Systems Using Radiators, Convectors, and Baseboard document contains very easy-to-follow instructions on how to size Taco Ventu...

This device, patented in 1905, is similar to the Honeywell Heat Generator. Thanks to Gerry Gill for finding and sharing it. Gerry points out that Lewis Eeggleston went on...

Here is the patent for the Eureka fitting, which is an early diverter tee. Thanks to Gerry Gill for finding and sharing the patent.

Here is Gil Carlson's circa-1951 patent for the Bell & Gossett Flo-Control Valve. Thanks to Steve Pajek for finding and sharing this document. 

Thanks to Mike Thies for finding and sharing this chapter. He writes, "This is from the book, Heating Design and Practice, 1951, by Robert Henderson Emerick. While not re...

Here's a look at the H. A. Thrush & Company product offering in 1946 for hot-water heating flow control valves, water circulators, pressure reducing valves, relief valves...

The International Correspondence Schools of Scranton, PA published this home-study course in 1907. It's a nice explanation of gravity hot water heating.

Here's an article, Heating by Hot Water, which appeared in The House Beautiful magazine around 1915.

This book from The Honeywell Heating Specialty Co., issued around 1910, contains complete instructions for the system that changed the way the Dead Men did hot-water heat...