To get email notification when someone adds to a thread you're following, click on the star in the thread's header and it will turn yellow; click again to turn it off. To edit your profile, click on the gear.
The Wall has a powerful search engine that will go all the way back to 2002. Use "quotation marks" around multiple-word searches. RIGHT-CLICK on the results and choose Open Link In New Window so you'll be able to get back to your results. Happy searching!
In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Need to contact us? Visit

weird gravity piping

norfitznorfitz Member Posts: 46
I did a load survey at a 2-story school from the 40's I think, and it is gravity hydronic. Every radiator on both floors was piped the same way, with the radiator as a bypass off a downcomer that came out of the ceiling and went into the floor. This system has evidently been running OK for 75 years or so, and I can't figure out why the radiators have flow. Oh, duh - I think I just got it. The cold water in the rad is heavier than the hot water in the pipe so it drains out and is replaced by hot water. I guess I asked the right guy. Anybody agree or disagree? Thanks for thinking about it.


This discussion has been closed.


It looks like you're new here. If you want to get involved, click one of these buttons!