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Posted by HeatPro on September 24, 2008 at 18:47:51:
In Reply to: Boiler pressure posted by Pete on September 24, 2008 at 12:34:11:
I would think that a hot water system that would have half a boiler full of water would have everything above it full of air. That means the system has a leak and nothing to fill it as it leaked, like the pressure reducing valve and/or the hand feed valve is shut, so the pressure on the gauge, which is usually at the top of the boiler would read zero.
One difference would be that the boiler was still powered and the thermostat calling for heat, so the system would be full of steam at that point - perhaps with the steam gauge reading 30 psig or so with the pressure relief valve blowing off steam.
But, why do you ask?
http://www.heatpro.us/purgeairtree/documents/D5F0F0F6AB134840F7ADDA6F136ED396F851F932.html