Loop Hot Water Heating Systems
In this excerpt from his Classic Hydronics seminar, Dan Holohan shares his knowledge about loop systems in hot water heating. A loop system is the simplest method of heat...
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.
Hot-Water Heating Categories
Air Elimination
Antifreeze
Boilers
Case Study
Circulators
Combustion
Commercial Heating
Corrosion
Domestic Hot Water
Gravity Hot-Water Systems
Heat Exchangers
Heating System Conversion
Indirect Heating Systems
Indoor Air Quality
Loop Systems
Piping and Pumps
Primary-Secondary Pumping
Pumping Away Piping
Radiant Heating
Radiators
Seminars
Snowmelt Systems
System Pressure
Tanks
Tees
Thermostatic Radiator Valves
Troubleshooting
Valves
Venting
Water Quality
Zoning
Recent Articles in Hot-Water Heating
Primary-Secondary Pumping with Multiple Boilers
Dan Holohan shares his knowledge about primary-secondary pumping with multiple boilers on hot-water heating systems.
Want to learn more? Read Dan Holohan’s book Classic...
Pumping Away on a One-Boiler Hot Water Heating System
Dan Holohan talks about applying the concept of Pumping Away on a one-boiler hot-water heating system. He’ll walk you through a diagram and explain how Pumping Away will ...
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.
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 Cautionary Tale for Replacing Boilers on Hot-Water Heating Systems
In this excerpt from his Classic Hydronics seminar, Dan Holohan tells a story about a mansion that had two Ideal Redflash boilers, each with a rating of 500,000 Btuhs. Da...
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 ...
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 ...