Skip to Content

Hot-Water Heating → Tees 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 → Tees

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...

Published on 11/20/2019 12:08 PM by Dan Holohan
Posted in Hot-Water Heating
o s fitting
The O-S Fitting

I was looking at a photograph of Crosley Field, a grand, Cincinnati, Ohio baseball stadium that burned to the ground in 1900. The men in the photo are wearing derbies and...

Published on 10/20/2014 3:40 PM by Dan Holohan
Posted in Hot-Water Heating
Diverter tee in basement ceiling
Diverter-Tee Q&A

Q: What's the principle of the diverter-tee system? A: This system lets you supply hot water to a radiator and return cooler water from the same radiator by using a singl...

Published on 06/18/2014 3:24 PM by Dan Holohan
Posted in Hot-Water Heating
108119 1
A Different Way to Pipe

I was raised by Bell & Gossett and gobbled up the writings of the late, great Gil Carlson for a lot of years. I learned about Monoflo systems and primary-secondary pumpin...

Published on 06/17/2014 3:22 PM
Posted in Hot-Water Heating