Naturally Circulating Hot Water System
A version of this article appears in the September/October 2008 issue of Home Energy Magazine.
September 07, 2008
Steve Greenberg is a facilities energy management engineer at Lawrence Berkeley National Laboratory and a technical editor at Home Energy. Q: I have been having a discussion with a fellow worker concerning our house heating systems. He claims to have a natural circulating hot-water system, in a two-story row home. He says it has no circulating pump and that temperature differential was the only reason the system worked. I did some research and all the systems I have seen on the Net show them as open systems, not closed. Also, the pipe size seems to have a lot to do with what creates the direction of flow. That is, large pipe for risers and small ones for returns. Isn’t it correct that for flow to occur, a differential pressure needs to exist? Isn’t this the reason for the different pipe sizes? Please explain how this system works. I find it hard to believe that temperature alone could move water through a boiler, piping, valves, and the radiators and back to the boiler. Pete Ianuzzi Baltimore, Maryland A: I have been having a discussion with a fellow worker concerning our house heating systems. He claims to have ...
To read complete online articles, you need to sign up for an Online Subscription.
The Home Energy Online articles are for personal use only and may not be printed for distribution. For permission to reprint, please send an e-mail to email@example.com.