What type of system do you have? Is the hot water and the heat from the
same boiler? If so, it is the water being heated causing the problem. Even
though the circulating pump is not running, the hot water will rise. Same
idea as hot air rises. This is wasting money to heat it and if you have AC,
making that work harder to cool it. Check for any valves that can be closed
to stop the water from circulating. Some systems have a sort of check valve
to prevent this.
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