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    Navien NCB-240/130H Water hammer

    Hi. I have a six month old Navien NCB-240-130H combi-boiler with two Honeywell V8043 zone valves. The unit replaced an old boiler and water tank in my 1976 home which has all copper radiant baseboard heat. About a month after installation I started noticing what seemed to be air sounds in one...
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