Our comprehensive HVAC Systems Help Center covers a wide range of HVAC-related topics, including air conditioning and heat pumps, geothermal, hot-water heating, thermostats and controls, solar, steam heating, and warm air. We also have a section of informative and entertaining articles to help you sharpen your HVAC business skills. And our Heating Museum is a captivating journey through the evolution of HVAC technologies.
This valve, patented in 1907, gave the people installing hot-water heat a way to compete with the people who were installing one-pipe steam. The Unique valve allowed gave...
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...
The Intensifier, invented by W.C. McKeown, does a job similar to the one performed by Honeywell's Heat Generator. Thanks to Steve Pajek for finding this patent.
Here is an interesting article from Western Plumbing and Heating Journal, April 1937, and a real call to arms!
Here is a patent issued to August Kehm for his tee fitting, later used by Bell & Gossett for their Monoflo. Thanks to Gerry Gill for the research, and for finding the pat...
Thanks to Gerry Gill for finding Oliver Schlemmer's patent for the O-S fitting, which made one-pipe hot water heating possible.
Edward Parker received this patent in 1911 for a different way to pipe a hot water radiator. Thanks to Steve Pajek for finding it and sharing it with us.
One of the earlier gravity-hot-water-heating devices. Water would stratify in the horizontal main, with the hottest water rising to the top of the pipe. It left the tee a...
Special thanks to George Peteya, P.E., of Slant/Fin for sharing this circa-1955 Sarcotherm Installation and Service Manual for Modulating Outdoor-Indoor Controls (Sarcoth...
Thanks to H.L. Bent of Melroy Plumbing & Heating Inc. in Baltimore for sharing these instructions and this photo of a fine old job.
