bleeding a boiler

Old 09-26-02, 05:52 AM
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draining sediment from a boiler

I have a Weil McLain boiler which I understand is supposed to be drained (until water runs clear) to removed sediments on a monthly basis.

When I open the spigot to drain sediments and the boiler is not fired up (heating water), no water will drain out. Water will drain out when the boiled is fired up.

The water level appears to be fine as I look at the sight glass. Should water drain when the boiler is idle?

Thanks in advance for any assistance and advice.

RD Harris

Last edited by rdharris; 09-26-02 at 07:41 AM.
Old 09-29-02, 11:57 AM
hvac4u's Avatar
Join Date: Aug 2001
Location: NW atlanta
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check with other pros

but in my opinion you have to open a bleed valve to allow air in when the drain is opened. the reason it may drain, again only opinion, is that with a temp increase comes a pressure increase, thereby pushing the water out. hat to see you get no responses, may try plumbing forum.

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