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 simple because it has few moving parts. The water is the only true moving part. Hot water rises; cold water sinks; it’s that simple. But at the same time, it’s complicated because the pipes have to be just the right size for the amount of water that’s flowing, and they have to have the perfect pitch. The fitter has to make sure to remove the burrs from the pipes he cuts, otherwise there could be too much friction presented to the flow.

Want to learn more? Read Dan Holohan’s book Classic Hydronics: How to Get the Most From Those Older Hot-Water Heating Systems.


Leave a comment

Related Posts

Circulators or Zone Valves

Back in my rep days, half a lifetime ago, I sold Bell & Gossett circulators. We didn’t have a viable zone valve available at the time, and when the factory finally showed...

Published on 01/25/2023 1:02 PM by Dan Holohan
Posted in Hot-Water Heating
Adventures in Pumping

I read somewhere that the most prevalent machine in the world is the electric motor. I thought about that for a while and it made sense. Just look around.

Published on 12/07/2021 11:47 AM by Dan Holohan
Posted in Hot-Water Heating