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Posted by Scott on January 11, 2008 at 06:28:20:
I have a standard residential oil-fired hot water boiler with internal domestic hot water. It has two zones, basement and first floor (single story 1000 sf ranch). The problem I have is, hot water is circulating through the first floor zone when the circulator pump is off. (I have pilot lamps on my circulator pumps, so I know when they are on.) Any idea's on what might be causing this?
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