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Posted by HeatPro on January 10, 2010 at 12:07:04:
In Reply to: Buderus OverPressure posted by Joe on December 29, 2009 at 21:30:33:
Look for something that blocks off the return side from the supply side. According to pressure laws of physics, pressures will be close on all sides, other than the pressure difference across the pump.
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