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Softus, thanks for the reply. I have located the vent plug on the radiators. They are opened using a small key. The water pipe which connects to the heating pipe is closed. There is an expansion tank which is empty with a relief valve off to the side located next to and above the heater...

When the heating system does not have a circulation pump how do you bleed the radiators? The heater is located in the basement and all the radiators are located on the first floor. The heater make is "Royal". Thank you.