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Zero Pressure on Boiler

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RSGlass
RSGlass Member Posts: 4
I have an old boiler (circa 1925) that shows a zero pressure reading when it's not operated, but normal (about 15) when the thermostat is turned on. I don't think the zero pressure is due to a leak, because adding water makes the pressure skyrocket. So the water level seems to be correct, the radiators have been bled, and pressure continues to drop to zero once the thermostat switches the boiler off. What's theh problem?

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