By using a pot of mercury and a submerged pipe, this device separated the water in the system from the water in the expansion tank. Honeywell called it the Heat Generator and it allowed open hot water systems to operate under pressure, and at higher temperatures, but still remain safe. This was a major advance in hot-water heating in that it allowed the hot-water people to compete with the steam people, whose prices were usually less. The patent dates to October 22, 1907. Thanks to Gerry Gill for sharing this with us.
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.