Square Pipes on a Heating System
Not all pipes are round. Some pipes are square! Dan Holohan tells the story of an interesting hot-water heating system he saw in Germany.
Hot-Water Heating → Piping and Pumps 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.
Recent Articles in Hot-Water Heating → Piping and Pumps
One-Pipe Hot-Water Heating Systems
Dan Holohan shares his knowledge about one-pipe hot-water heating systems. He talks about diverter tees, monoflo tees, thermostatic radiator valves, pumping away from ...
Pumping Tips for Hot Water Heating Systems
In this excerpt from his Classic Hydronics seminar, Dan Holohan shares his knowledge about pumps in hot water heating systems. He talks about the history of circulator...
A Copper Mystery
We’ve lived in this little house in Bethpage, NY since 1977. Bethpage was once home to Grumman, which built fighter planes, canoes, campers, buses, and the Apollo Lunar M...
The Return Pipe That Was a Supply
The heating business has a way of humbling you. After more than 25 years of running service calls on all types of heating and cooling systems, I had managed to tackle the...
Podcast: Pumping Away and More
Dan Holohan talks with Bryan Orr of HVAC School about how he got his start in the industry, pumping away, classic hydronics, and more in this entertaining podcast.
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PEX for Hydronic Distribution Piping
If you were to ask someone with knowledge of the hydronics industry, “What’s the first thing that comes to mind when you hear the words ‘PEX tubing and hydronics’?” chanc...
The Power of Re-piping with PEX
For aging buildings — or newer structures with piping-performance issues — the decision to continue repairing the existing plumbing and heating systems versus doing a tot...
Threaded Copper Tubing
A discussion on The Wall: Paul S. asked, "Has ever heard of screwed copper pipe? I have it on a job and sizes are way off.
Why Closely Spaced Tees?
Primary-secondary piping systems call for the tees that go off to the secondary circuit to be close together, ideally not more than six inches apart. Think like water and...