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Old 09-22-2011, 01:54 PM   #1
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Draining plumbing


I own a very old home which has a basement sump next to water heater and boiler. I want to drain both hot and cold supplies from the floors above. My question is if I shut of the incoming supply and open the exterior garden hose bib will both hot and cold supplies drain down to the hose bib level? Guess I'm wondering if the water column will equalize through the hot water tank.

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Last edited by Marvel; 09-22-2011 at 02:10 PM.
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Old 09-22-2011, 06:18 PM   #2
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Draining plumbing


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Originally Posted by Marvel View Post
I own a very old home which has a basement sump next to water heater and boiler. I want to drain both hot and cold supplies from the floors above. My question is if I shut of the incoming supply and open the exterior garden hose bib will both hot and cold supplies drain down to the hose bib level? Guess I'm wondering if the water column will equalize through the hot water tank.
Yes the water levels in hot and cold subsystems will equalize through the hot water tank even if the tank is below the hose bibb.

It will go faster if you open up hot and cold faucets on each branch, generally means some faucets on each floor.

Some water may stay behind in horizontal sections that are not quite level namely slope backwards a tad. Things like this result in burst pipes in winter even though you went through the motions of draining the plumbing.

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Marvel (09-23-2011)
Old 09-23-2011, 09:09 AM   #3
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Draining plumbing


Thank you for your assistance. Cheers
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