Honeywell’s Unique Valve
Mark Honeywell invented the Unique Valve in the early 1900s. It gave him a way of connecting a hot-water radiator at just one side instead of two sides. The Unique valve ...
Hot-Water Heating Help Topics
This section is your guide to hot-water heating systems with information about system design and piping, air elimination, pumping away, primary-secondary pumping, valves, radiators, troubleshooting tips, and more.
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Indoor Air Quality
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Piping and Pumps
Primary-Secondary Pumping
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Thermostatic Radiator Valves
Troubleshooting
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Recent Articles in Hot-Water Heating
The Development of One-Pipe Hot Water Heating and the OS Fitting
In this excerpt from his Classic Hydronics seminar, Dan Holohan teaches us about the roots of modern hot water heating. At the turn of the 19th Century, central heating w...
Mark Honeywell’s Solution to Stratification in Gravity Systems
Dan Holohan discusses one of Mark Honeywell’s contributions to gravity hot water heating. He wanted to create even heat throughout the building, so in 1909 he solved the ...
Honeywell's Heat Generator
In this excerpt from his Classic Hydronics seminar, Dan Holohan teaches us about Mark Honeywell’s Heat Generator. In the early days of hot water heating, Mark Honeywell i...
How Gravity Hot-Water Heating Systems Work
In this video, Dan Holohan teaches us about gravity hot-water heating systems. Classic gravity heating is both the simplest and the most complicated system of all. It’s s...
The First Hot-Water Heating System
Jean Simon Bonnemain created the very first hot-water heating system in Paris in 1777 to heat chickens. In this video, Dan Holohan shares how this system worked and how i...
Steam-to-Water Heat Exchangers
Many buildings, particularly modern buildings, work with both steam and hot-water heating systems. In this excerpt from his Dead Men’s Steam School seminar, Dan Holohan g...
Indirect Heating Systems
In this video, Dan Holohan tells us about indirect heating. It is a method of heating that the old-timers used to warm fresh air before it entered a building. They placed...
Eureka: An Early Diverter Tee
In 1897, Eureka made an early version of what we now call the diverter tee. It worked by creating a drop in pressure along its run, which encouraged the water to flow int...
Radiator Covers
Let’s take a look at radiator enclosures. Some people use them because they think old radiators are ugly (I sure don’t). Others use them to protect children from burns (I...