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Pigtail and/or pressuretol keep getting clogged on my Burnham steam boiler
Hi. I have a Burnham, natural-gas steam boiler in my home. Once or sometimes twice a year -- usually when it is VERY cold outside and my boiler therefore has to run quite a lot -- the boiler's pigtail or its pressuretrol gets clogged. I know this because every time it happens, I call out a repair person and he cleans out either the pigtail or the pressuretrol or both and that resolves the problem. Does anyone know why these things would get clogged once or twice a year? I keep the boiler's water clean by flushing it and replacing the water every few weeks, so I presume it's not a water-quality problem. I'd be grateful for any advice.